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Digital Transformation In IndustryTop 10 Best Legacy Modernization Services of 2026
Editorial roundup comparing legacy modernization services like Hexaware, IBM Consulting, and Accenture for teams evaluating provider tradeoffs and fit.
How we ranked these tools
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Framework: Features 40% · Ease 30% · Value 30%
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Hexaware is the best choice for large enterprises in regulated sectors because its RapidX helps teams understand difficult legacy code and its Amaze automates major parts of cloud transformation, tackling both the knowledge bottleneck and the engineering execution burden, while IBM Consulting fits when you need IBM Z expertise and modernization guidance for COBOL estates thanks to watsonx Code Assistant for Z.
Editor’s top 3 picks
Three quick recommendations before you dive into the full comparison below — each one leads on a different dimension.
Hexaware
Hexaware’s distinctive strength is the combination of RapidX and Amaze: RapidX supplies AI-assisted understanding of difficult legacy code and project knowledge, while Amaze automates major parts of cloud transformation. Together they address both the human knowledge bottleneck and the engineering execution burden that commonly slow large modernization programs.
Best for: Large enterprises in financial services, insurance, healthcare, travel, technology, and other regulated sectors that need to modernize mission-critical applications while combining cloud engineering, testing, automation, and long-term operations.
IBM Consulting
Editor pickwatsonx Code Assistant for Z provides AI-assisted COBOL explanation, code transformation, and modernization task guidance.
Best for: Fits when global enterprises need IBM Z expertise, hybrid-cloud delivery, and governance across complex modernization programs.
Accenture
Editor pickAccenture myNav connects automated cloud assessments with target architectures and migration sequencing.
Best for: Fits when large enterprises need coordinated modernization across mainframes, custom applications, cloud infrastructure, and operations.
Comparison Table
Hexaware
enterprise_vendorHexaware designs, builds, modernizes, and operates enterprise AI applications using generative AI engineering, proprietary software platforms, cloud services, data engineering, and industry-focused digital product development.
Hexaware’s distinctive strength is the combination of RapidX and Amaze: RapidX supplies AI-assisted understanding of difficult legacy code and project knowledge, while Amaze automates major parts of cloud transformation. Together they address both the human knowledge bottleneck and the engineering execution burden that commonly slow large modernization programs.
Hexaware combines consulting, engineering, cloud services, testing, and ongoing operations rather than treating modernization as a standalone migration project. Its published examples include converting older Java and EJB applications into Spring Boot REST services, decomposing monolithic systems into microservices, optimizing hundreds of database tables, modernizing more than a million lines of code, and rebuilding user interfaces with Angular. RapidX adds AI-generated subject-matter expertise, code comprehension, automated testing, and delivery assistance to projects where documentation and legacy skills are limited.
The tradeoff is that Hexaware is best suited to substantial enterprise programs with executive sponsorship, multiple technology teams, and a willingness to coordinate a distributed delivery model. A housing-finance modernization illustrates the fit: Hexaware combined AWS services, phased delivery, database changes, automated tests, API work, security controls, and iterative releases to modernize a highly consequential application without a disruptive cutover.
- +RapidX provides AI-assisted code comprehension, virtual subject-matter expertise, automated testing, and modernization delivery support.
- +Amaze connects application transformation with cloud landing zones, code conversion, serverless deployment, and automated release processes.
- +Hexaware can combine engineering, cloud, data, cybersecurity, testing, enterprise platforms, and managed operations under one provider.
- –Large transformation programs may require substantial client governance, architecture alignment, and coordination across distributed teams.
- –Coverage and local delivery capacity can vary by country, so multinational buyers may need to plan for offshore collaboration.
- –The broad service portfolio can make scoping and selecting the right modernization workstream more complex than with a narrowly focused specialist.
Housing finance technology teams
Modernize aging loan applications on AWS
Scalable cloud-native operations
Mainframe-dependent insurers
Expose core systems to digital channels
Faster digital product delivery
Show 2 more scenarios
Airline operations teams
Modernize crew scheduling software
Reduced legacy skills dependency
RapidX helps teams understand aging code and accelerate engineering work around operationally sensitive scheduling applications.
Enterprise application leaders
Create a phased modernization roadmap
Lower transition risk
Hexaware assesses application estates and aligns cloud, architecture, testing, data, and operations work into sequenced transformation programs.
Best for: Large enterprises in financial services, insurance, healthcare, travel, technology, and other regulated sectors that need to modernize mission-critical applications while combining cloud engineering, testing, automation, and long-term operations.
IBM Consulting
enterprise_vendorIBM's consulting division offers legacy modernization services leveraging proprietary mainframe expertise and hybrid cloud migration frameworks.
watsonx Code Assistant for Z provides AI-assisted COBOL explanation, code transformation, and modernization task guidance.
Enterprise legacy modernization programs require code analysis, migration sequencing, platform engineering, and operating-model change across mainframes and distributed systems. IBM Consulting combines IBM Z expertise with Red Hat OpenShift delivery, hybrid-cloud architecture, and application engineering services.
watsonx Code Assistant for Z supports COBOL application understanding and AI-assisted transformation workflows, while IBM Garage workshops connect business priorities to sequenced delivery increments. The breadth suits regulated enterprises, but large engagements require substantial client governance and architecture coordination.
- +IBM Z specialists support COBOL estates, dependency analysis, and phased migration planning.
- +watsonx Code Assistant for Z adds AI-assisted code explanation and transformation support.
- +Red Hat OpenShift delivery connects container adoption with hybrid-cloud operating models.
- +IBM Garage workshops link executive priorities to sequenced engineering backlogs.
- –Large programs can involve multiple IBM teams, increasing decision overhead for client architecture offices.
- –AI-assisted code transformation still requires human validation, regression testing, and application-owner review.
- –Service quality depends on access to legacy code, business rules, and subject-matter experts.
Enterprise legacy application leaders
Stage modernization across COBOL and z/OS
Staged modernization plan delivered
Data governance and platform teams
Publish governed data products for reuse
Reusable data products
Show 2 more scenarios
AI and operations teams
Move pilots into production AI workflows
Production AI workflows
Integrates natural language use cases into operational processes with security and change controls.
Commerce and operations leaders
Modernize connected commerce operating model
Connected commerce platform changes
Coordinates storefront and back-office changes to keep fulfillment, returns, and customer experiences aligned.
Best for: Fits when global enterprises need IBM Z expertise, hybrid-cloud delivery, and governance across complex modernization programs.
Accenture
enterprise_vendorGlobal professional services firm with a dedicated application modernization practice covering mainframe, legacy ERP, and custom application migration.
Accenture myNav connects automated cloud assessments with target architectures and migration sequencing.
Accenture can coordinate COBOL estates, distributed applications, ERP environments, data platforms, and infrastructure under one program structure. Its delivery model combines strategy, engineering, testing, security, and operations teams across regions. API enablement and asynchronous integration support gradual replacement of tightly coupled interfaces.
The tradeoff is delivery complexity, since large programs require strong client architecture ownership, governance, and decision-making. Large banks can use Accenture for mainframe modernization that combines code analysis, test automation, and staged cutovers. Smaller application estates may receive less attention than multi-workstream transformation programs.
- +myNav links workload assessments to cloud architecture recommendations.
- +Global delivery teams cover mainframe, SAP, custom applications, data, and infrastructure.
- +Industry assets support banking, insurance, healthcare, and public-sector estates.
- +Cloud partnerships span AWS, Microsoft Azure, Google Cloud, and Oracle.
- –Large delivery programs require substantial client governance and architecture capacity.
- –Engagement quality depends heavily on the assigned geography, partner mix, and delivery team.
- –Smaller migrations may receive less attention than multi-workstream transformation programs.
- –Custom work can require coordination across strategy, engineering, security, and operations teams.
Enterprise CIO offices
Mixed estate sequencing
Prioritized execution sequence
Mainframe program owners
COBOL estate modernization
Lower transition risk
Show 2 more scenarios
Regulated banking teams
Controlled core replacement
Controlled production transition
Accenture coordinates security controls, data validation, parallel operations, and audit evidence across migration workstreams.
Cloud engineering teams
Cloud landing-zone transition
Clearer migration sequencing
myNav assesses workload dependencies and maps target environments before engineering teams execute prioritized moves.
Best for: Fits when large enterprises need coordinated modernization across mainframes, custom applications, cloud infrastructure, and operations.
Infosys
enterprise_vendorInfosys delivers legacy modernization through its Application Development and Maintenance practice with proprietary zero-distance migration frameworks.
Infosys Topaz applies generative AI to code analysis, documentation, test creation, and modernization planning.
Infosys combines application portfolio assessment with target-state architecture, dependency mapping, and migration waves for large estates. Cobalt connects cloud adoption, infrastructure engineering, and application delivery, while Topaz supports code analysis, documentation, and test creation. Delivery teams can cover rehost programs, data conversion, code restructuring, and post-migration operations.
- +Topaz supports code analysis, documentation, and automated test creation.
- +Cobalt connects cloud infrastructure, application delivery, and operating-model services.
- +Large delivery teams support multi-country modernization programs.
- +Mainframe, ERP, and custom application expertise covers mixed enterprise estates.
- –Delivery quality depends heavily on assigned team composition and governance.
- –Multiple workstreams can create complex coordination across client and vendor teams.
- –AI-assisted code outputs require domain review before production changes.
Banking technology leaders
COBOL estate transition
Phased core-system migration
Global CIO offices
Portfolio-wide cloud transition
Coordinated cloud adoption
Show 2 more scenarios
Insurance operations teams
Batch workload reengineering
Faster claims processing
Infosys redesigns selected processing flows and connects them with newer customer and claims applications.
Public sector IT
Aging application consolidation
Reduced application duplication
Delivery teams assess redundant systems, sequence migrations, and maintain operations during transition.
Best for: Fits when global enterprises need one delivery partner for mainframe, custom applications, cloud, and managed operations.
Tata Consultancy Services
enterprise_vendorTCS provides legacy modernization services through its Migration Factory model covering mainframe, COBOL, and legacy ERP transformation.
TCS MasterCraft TransformPlus automates legacy code analysis, documentation, and conversion across supported languages and target architectures.
Tata Consultancy Services combines global delivery capacity with MasterCraft tools for code analysis, documentation, and conversion across selected legacy technologies. Its services cover application portfolio assessment, cloud migration, mainframe modernization, testing, data movement, and API enablement. TCS also brings sector-specific teams and established delivery methods for regulated banking, insurance, retail, manufacturing, and public-sector estates.
- +MasterCraft automates code analysis, documentation, and conversion for selected legacy languages.
- +Global delivery teams cover cloud, mainframe, testing, data, and integration workstreams.
- +Industry practices address compliance requirements in banking, insurance, healthcare, and government.
- +Large partner ecosystem supports AWS, Microsoft Azure, Google Cloud, and enterprise software environments.
- –Delivery quality depends heavily on assigned teams, governance, and client-side architecture ownership.
- –MasterCraft automation does not eliminate manual remediation for complex business rules and undocumented dependencies.
- –Large transformation programs can introduce layered coordination across TCS units and technology partners.
- –Smaller organizations may receive less standardized engagement than large multi-system enterprises.
Enterprise application and cloud teams
Modernize apps and migrate workloads to cloud
Migration plan executed
Data platform and database teams
Modernize data models and migration artifacts
Schema changes prepared
Show 2 more scenarios
Enterprise finance and operations teams
Modernize ERP with migration and testing
ERP transition validated
Aligns processes, migrates data, tests integrations, and supports ERP cutover validation.
Enterprise workplace IT leaders
Migrate and operate workplace services
Ongoing workplace support
Designs and transitions endpoint services, collaboration capabilities, and service desk workflows.
Best for: Fits when large enterprises need coordinated modernization across mainframes, cloud estates, data systems, and regulated operations.
Capgemini
enterprise_vendorCapgemini offers legacy modernization through its Cloud Infrastructure Services and Application Services divisions covering mainframe and custom app modernization.
Capgemini ADMnext combines application engineering, cloud operations, automation, and managed services within one operating framework.
Capgemini fits large organizations coordinating mainframe modernization, cloud migration, and application engineering across several business units. Its distinction is a broad delivery model that combines consulting, systems integration, managed application services, and engineering teams.
- +ADMnext connects application engineering, cloud operations, automation, and managed services under one delivery model.
- +Mainframe teams can combine COBOL expertise with cloud migration and application engineering capabilities.
- +Global delivery centers support large programs with specialized industry and technology teams.
- +API enablement and integration services support staged replacement of tightly coupled applications.
- –Large account structures can introduce multiple governance layers and slower decision paths.
- –Delivery quality depends heavily on the assigned regional team and subcontractor mix.
- –Smaller modernization programs may receive less senior attention than enterprise-scale engagements.
- –Complex transformation programs require substantial client-side architecture, data, and change-management coordination.
Enterprise architecture teams
Modernize z/OS workloads with sequencing
Prioritized modernization roadmap
Cloud and application leaders
Run governed cloud migration across programs
Governed cloud environment
Show 2 more scenarios
Finance and performance management teams
Standardize performance reporting across systems
Consistent reporting delivered
Defines KPIs and delivers recurring dashboards, scorecards, refresh schedules, and role-based distribution.
Procurement operations teams
Standardize procure-to-pay workflows
Tracked procurement exceptions
Combines managed procurement execution with workflow standardization, supplier onboarding, and system integration.
Best for: Fits when enterprises need coordinated modernization across mainframes, cloud estates, and distributed application teams.
Unisys
enterprise_vendorUnisys provides legacy modernization services specializing in mainframe migration, ClearPath transformation, and legacy workload cloud adoption.
ClearPath Forward ePortal exposes MCP and OS 2200 application functions through REST and SOAP interfaces.
Unisys modernizes mainframe estates with particular depth in its own ClearPath MCP and OS 2200 environments. ClearPath Forward ePortal exposes legacy application functions through REST and SOAP interfaces without requiring immediate replacement of core transaction logic.
- +ClearPath Forward supports MCP and OS 2200 estates without forcing immediate core replacement.
- +ePortal exposes legacy transactions through REST and SOAP services.
- +Unisys combines modernization delivery with infrastructure and managed operations.
- –ClearPath specialization limits relevance for IBM Z, distributed COBOL, and non-Unisys estates.
- –Engagements depend heavily on Unisys architects and tailored discovery.
- –Customer-facing delivery is consultative rather than self-service.
Enterprise modernization program teams
Migrate legacy systems with operational handoff
Phased migration completed
Infrastructure and cloud leaders
Maintain continuity during hybrid modernization
Managed operational continuity
Show 2 more scenarios
Workplace and endpoint teams
Centralize endpoint operations for legacy users
Centralized device coverage
Coordinates endpoint support, device monitoring, remediation, and operational coverage across user fleets.
Enterprise IT service desk leaders
Unify regional service desk workflows
More consistent incident handling
Unifies service desk ownership with shared workflows and escalation paths across business units.
Best for: Fits when organizations need to extend Unisys ClearPath workloads without replacing core transaction logic.
DXC Technology
enterprise_vendorDXC offers legacy modernization services focused on mainframe migration, legacy workload transformation, and enterprise application modernization.
COBOL and z/OS services combine code assessment, conversion, testing, and staged migration support.
DXC Technology pairs legacy modernization with long-term infrastructure and application operations, distinguishing it from firms focused mainly on short transformation programs. Its delivery covers application portfolio assessment, mainframe modernization for COBOL and z/OS estates, and cloud migration across hybrid environments.
- +Deep z/OS and COBOL experience supports complex mainframe estates.
- +Combines modernization delivery with application and infrastructure operations after migration.
- +Industry practices cover insurance, banking, healthcare, and public-sector workloads.
- –Large delivery model can create heavier governance and slower decision cycles.
- –Consulting-led execution offers fewer self-service controls than software-led competitors.
- –Portfolio breadth can make ownership and workstream boundaries harder to define.
Enterprise transformation architects
Coordinate modernization across platforms and middleware
Interdependent estate modernized
Multinational enterprise IT teams
Support employees across multi-country workplaces
Coordinated regional support
Show 2 more scenarios
Organizations completing cloud programs
Shift to managed cloud operations after migration
Steady-state cloud operations
Transfers monitoring, incident handling, change control, and cloud operations into steady-state support.
Airline technology and ops teams
Run passenger and operational systems under governance
Coordinated operational workflows
Coordinates operational workflows with integration and run-phase governance for interdependent systems.
Best for: Fits when large enterprises need mainframe modernization tied to ongoing infrastructure and application operations.
Deloitte
enterprise_vendorDeloitte's technology consulting practice offers legacy modernization strategy, mainframe migration, and legacy ERP transformation services.
Deloitte’s mainframe modernization practice links automated code analysis with dependency mapping and staged migration planning for complex COBOL estates.
Deloitte fits large enterprises with fragmented COBOL estates, multiple business units, and a need for consulting-led modernization governance. Its distinct strength is combining application portfolio assessment with cloud architecture, operating-model design, and industry-specific controls rather than delivering code conversion alone. Teams can use Deloitte for mainframe modernization, API enablement, automated testing, and staged production cutovers, but delivery depends heavily on assigned specialists, client decision speed, and program governance.
- +Industry-specific controls support regulated banking, healthcare, and public-sector estates.
- +Global delivery teams cover architecture, engineering, testing, and change management.
- +Automated code analysis can prioritize dependencies inside large legacy estates.
- +API enablement supports staged exposure of core transactions.
- –Engagements can become consulting-heavy before engineering throughput is visible.
- –Large programs require strong client-side product ownership and architecture decisions.
- –Delivery quality can vary by partner mix, geography, and subcontracting model.
- –Smaller migrations may receive less attention than enterprise transformation programs.
Supply chain technology leaders
Modernize EDI and partner connectivity
Structured partner connectivity
Marketing analytics stakeholders
Model channel effects for budget planning
Budget planning insights
Show 2 more scenarios
Technology finance and controllership
Design IT accounting and close workflows
Close workflows documented
Maps technology costs, assets, accruals, and depreciation into controlled close processes.
Regulated deal teams and finance leaders
Produce review-ready valuation documentation
Defensible valuation outputs
Creates valuation outputs using discounted cash flow and market approaches with supporting assumptions.
Best for: Fits when regulated enterprises need a global team to coordinate mainframe, cloud, architecture, testing, and operating-model change.
Cognizant
enterprise_vendorCognizant provides legacy modernization services covering mainframe migration, legacy application reengineering, and cloud-native transformation.
Cognizant Mainframe Modernization Factory combines automated code analysis, transformation workflows, testing, and staged cutover for large estates.
Cognizant differentiates through a delivery model combining mainframe engineering, cloud migration, and industry-specific implementation teams. Delivery extends from portfolio assessment through code conversion, test automation, data movement, and production cutover across hybrid estates. Industry teams add domain controls for banking, insurance, healthcare, and manufacturing, while multi-vendor programs require substantial client governance.
- +Automated code analysis supports COBOL estate assessment, transformation, testing, and staged cutover.
- +Industry teams provide domain patterns for banking, insurance, healthcare, and manufacturing workloads.
- +Skygrade provides cloud assessment and migration workflows for complex application estates.
- –Multi-vendor delivery can create coordination overhead across architecture, engineering, and testing teams.
- –Smaller teams may find Cognizant's enterprise delivery model heavier than their governance capacity.
- –Public materials provide limited detail on reusable API catalogs and administrator-facing controls.
- –Success depends on client-side ownership for data decisions, testing sign-off, and cutover governance.
Enterprise CIO application teams
Modernize legacy apps and run structured migration
Release execution delivered
Enterprise engineering and operations teams
Transform DevOps delivery processes for estates
More consistent delivery
Show 2 more scenarios
Supply chain integration teams
Modernize legacy B2B interfaces and EDI flows
Supported B2B data flows
Maps data, onboard trading partners, modernizes interfaces, and supports ongoing B2B operations.
Global HR and payroll organizations
Transition multi-country HR and payroll operations
Clear processing oversight
Runs or transitions multi-country payroll and HR processes with governance, reporting, and exception handling.
Best for: Fits when large enterprises need a partner for mainframe estates, regulated workloads, and multi-stream cloud programs.
Conclusion
After evaluating 10 legacy modernization, Hexaware stands out as our overall top pick — it scored highest across our combined criteria of features, ease of use, and value, which is why it sits at #1 in the rankings above.
Use the comparison table and detailed reviews above to validate the fit against your own requirements before committing to a tool.
How to Choose the Right Legacy Modernization
This guide compares Hexaware, Infosys, Accenture, IBM Consulting, Tata Consultancy Services, Capgemini, Cognizant, DXC Technology, Unisys, and Deloitte across application assessment, code transformation, cloud migration, testing, and delivery governance.
Hexaware ranks first for combining RapidX code comprehension with Amaze cloud transformation automation, while the other providers differ in mainframe specialization, operating models, integration scope, and delivery structure.
What Legacy Modernization Covers Across Code, Platforms, and Operations
Legacy modernization is the controlled change of aging applications, runtimes, data stores, and operating models without losing required business behavior. It can involve code comprehension, COBOL transformation, API exposure, cloud migration, automated testing, staged cutover, or continued operation of core transaction systems.
Hexaware combines RapidX code understanding with Amaze cloud transformation automation, while Unisys uses ClearPath Forward ePortal to expose MCP and OS 2200 functions through REST and SOAP. These approaches distinguish broad estate transformation from targeted integration that preserves an existing transaction core.
Legacy Modernization Criteria for Code, Platforms, and Delivery
Legacy modernization providers differ in how they interpret old code, automate transformation, expose transaction functions, and manage migration delivery. These differences affect application risk, testing effort, and the amount of client architecture work required.
Code comprehension and transformation automation
Hexaware RapidX applies AI-assisted code comprehension, virtual subject-matter expertise, and automated testing to difficult legacy estates. IBM Consulting uses watsonx Code Assistant for Z to explain COBOL, guide transformation tasks, and support human review.
Assessment-to-cloud sequencing
Accenture myNav connects automated workload assessments with target architectures and migration sequencing. Hexaware Amaze extends transformation into cloud landing zones, code conversion, serverless deployment, and automated release processes.
Mainframe and operating-model coverage
DXC Technology combines COBOL and z/OS modernization with application and infrastructure operations after migration. Capgemini ADMnext places application engineering, cloud operations, automation, and managed services within one delivery framework.
Transaction exposure without core replacement
Unisys ClearPath Forward ePortal exposes MCP and OS 2200 application functions through REST and SOAP interfaces. The approach preserves ClearPath transaction logic while adding access for newer applications.
Estate-scale conversion and staged cutover
Tata Consultancy Services MasterCraft TransformPlus automates analysis, documentation, and conversion across supported legacy languages and target architectures. Cognizant Mainframe Modernization Factory combines code analysis, transformation workflows, testing, and staged cutover for large estates.
Governance across regulated workstreams
Infosys combines Topaz code analysis and automated test creation with Cobalt cloud infrastructure and operating-model services. Deloitte adds industry-specific controls and coordinates architecture, engineering, testing, and change management for banking, healthcare, and public-sector estates.
Decision Points for Mainframe, Distributed Application, and API Modernization
The choice depends first on the estate shape and the required change pattern. IBM Consulting and DXC Technology address IBM Z and z/OS depth, while Unisys targets ClearPath environments and Hexaware covers broader application and cloud transformation.
Choose replacement, transformation, or controlled exposure
Select Unisys when existing MCP or OS 2200 transaction logic should remain in place and new REST or SOAP access is the immediate requirement. Select Hexaware, TCS, or Cognizant when code conversion, application restructuring, or staged cutover is part of the target state.
Match the provider to the runtime estate
IBM Consulting and DXC Technology suit IBM Z, COBOL, and z/OS estates that require specialist operating knowledge. Unisys suits ClearPath estates, while Accenture, Infosys, Capgemini, and Hexaware cover mixed mainframe, custom application, cloud, and infrastructure portfolios.
Choose automation depth against business-rule complexity
Hexaware RapidX and Infosys Topaz focus on code understanding, documentation, and test creation before engineering changes begin. TCS MasterCraft TransformPlus and Cognizant Mainframe Modernization Factory place more emphasis on repeatable conversion and staged delivery, but undocumented business rules still require application-owner validation.
Decide between assessment-led sequencing and operating-model consolidation
Accenture myNav suits programs that need workload assessment linked directly to target architecture and migration sequence. Capgemini ADMnext and Infosys Cobalt suit enterprises that want modernization delivery connected to cloud operations and ongoing service management.
Set governance capacity before selecting delivery scale
Large programs from Accenture, IBM Consulting, Deloitte, and Cognizant require client architecture ownership, product decisions, and coordination across multiple workstreams. Smaller modernization teams may prefer the narrower ClearPath specialization of Unisys or a defined z/OS operating scope from DXC Technology.
Enterprise Profiles That Benefit from Legacy Modernization Services
These providers serve different combinations of runtime specialization, regulatory control, cloud transformation, and continuing operations. The strongest match depends on the application estate and the internal capacity available for architecture, testing, and business-rule validation.
Regulated enterprises with large mixed estates
Hexaware, Infosys, Accenture, and Deloitte support combinations of custom applications, mainframes, cloud infrastructure, testing, and operating-model change. Their delivery scope suits financial services, insurance, healthcare, and public-sector organizations with multiple governance stakeholders.
IBM Z and COBOL estate owners
IBM Consulting and DXC Technology provide IBM Z, z/OS, COBOL, dependency analysis, conversion, testing, and migration support. IBM Consulting adds watsonx Code Assistant for Z, while DXC Technology connects modernization with continuing infrastructure and application operations.
ClearPath organizations preserving core transaction logic
Unisys supports MCP and OS 2200 estates through ClearPath Forward and ePortal. REST and SOAP exposure can extend existing transactions without requiring immediate replacement of the core system.
Enterprises coordinating modernization with managed operations
Capgemini, Infosys, and TCS cover combinations of application engineering, cloud operations, data systems, testing, and integration workstreams. These providers fit organizations that need delivery and post-migration operations coordinated across distributed teams.
Common Errors in Legacy Modernization Provider Selection
Provider scope does not guarantee a workable modernization path. Each program must account for undocumented dependencies, human validation, operating ownership, and the client decisions required across architecture and application teams.
Treating code conversion as a substitute for business-rule validation
TCS MasterCraft TransformPlus, IBM watsonx Code Assistant for Z, and Cognizant automation still require manual remediation, regression testing, and application-owner review for complex or undocumented rules.
Selecting a broad global provider without assigning client architecture ownership
Accenture, IBM Consulting, Deloitte, and Infosys can involve multiple delivery teams and workstreams. A named client architecture office must control target decisions, dependencies, and acceptance criteria.
Choosing a mainframe specialist for a nonmatching runtime
DXC Technology and IBM Consulting center on IBM Z and z/OS, while Unisys centers on MCP and OS 2200. The runtime inventory must match the provider's actual platform expertise before contract scope is defined.
Expecting API exposure to deliver full application modernization
Unisys ClearPath Forward ePortal adds REST and SOAP access to existing MCP and OS 2200 functions. API exposure extends transactions but does not replace the underlying application logic or resolve undocumented dependencies.
How We Selected and Ranked These Providers
We evaluated each provider's application assessment, code transformation, cloud migration, testing, automation, and delivery governance capabilities. We weighted features at 40 percent, ease of use at 30 percent, and value at 30 percent.
We compared documented capabilities across RapidX, Amaze, Topaz, myNav, watsonx Code Assistant for Z, MasterCraft TransformPlus, ADMnext, and ClearPath Forward. Hexaware ranked first because RapidX combines AI-assisted legacy code comprehension with Amaze automation across cloud landing zones, code conversion, serverless deployment, and release processes.
Frequently Asked Questions About Legacy Modernization
How do legacy modernization services connect older applications to newer systems?
Which providers support mainframe modernization without an immediate full rewrite?
When should an enterprise use a staged migration instead of a single cutover?
How do providers handle data migration during application modernization?
How are SSO, security controls, and compliance requirements incorporated into delivery?
What administrative controls are needed to manage a large modernization program?
Where do legacy modernization services fall short for heterogeneous estates?
What technical capabilities distinguish the providers beyond standard cloud migration?
How should an enterprise begin evaluating a legacy modernization service?
Tools reviewed
Primary sources checked during evaluation.
Referenced in the comparison table and product reviews above.
Funding and competing interests
This study was co-funded by several of the vendors assessed in it. No single vendor funded it. Funders could propose the market studied.
They had no role in selecting vendors, setting or weighting criteria, analysing data or drawing conclusions, and they received the same factual-accuracy check as every other vendor assessed.
Market definition, inclusion rules and criteria weights were fixed by an editor before research began and did not change afterwards. Editorial process →
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