Top 9 Best Planetary Gear Design Software of 2026

eAssistant is built around planetary gear train synthesis flows where the user defines stage architecture and design intent, then validates kinematics and ratios for power-flow planning. It also provides design input parameters that map cleanly to gear-geometry inputs used in CAD modeling and documentation cycles. The software favors deterministic calculations over interactive visual sketching, so results stay consistent across runs when the same parameters are reused.

A key tradeoff is that eAssistant does not replace full mechanical CAD features for gear solids, so tooth profile detail and assembly phasing still depend on the CAD side. It works best when a team needs a standardized planetary stage parameter set, like for a stepped-planetary arrangement used across multiple variants. It also fits engineering groups that want to reduce manual ratio math before committing to expensive CAD and documentation steps.

MITCalc performs planetary gear train synthesis and sizing using spreadsheet-style calculations for kinematics, contact, and bending checks. It covers gear mesh geometry inputs such as module or diametral pitch, pressure angle, and profile shift, then computes capacity checks like ISO 6336 style stress results and contact risk indicators.

For CAD workflows, it focuses on producing design calculation outputs rather than driving a parametric solid model automatically. The workflow fits teams that prefer repeatable calculation sheets and engineering review over tight CAD co-simulation.

Hexagon ZAR5 is positioned for teams that repeatedly configure planetary stage variants such as simple and compound layouts and need consistent calculation outputs. The tool helps manage core design inputs such as module or diametral pitch choices, pressure angle selection, and backlash specifications while generating meshing geometry references. It also connects design results to practical CAD export paths so teams can move from synthesis into modeling and check workflows. Governing the iterative loop is a major theme, since changes to stage parameters propagate through kinematic and geometry outputs.

A tradeoff appears in the hands-off CAD integration layer, since ZAR5 is strongest at gear-train synthesis and analysis and less centered on end-to-end mechanical modeling. The best fit is early-to-mid design where tooth-count selection and profile shift decisions must be evaluated quickly, then passed into CAD or verification tooling for detailed stress work. Teams that require deep, manual CAD feature construction inside the same environment may find round-tripping overhead more noticeable than in CAD-native gear modeling approaches.

Planetary Gear Maker focuses on planetary stage synthesis workflows where tooth counts, module or diametral pitch, and mesh geometry choices drive downstream geometry generation. Output is geared to CAD handoff with export formats intended for continuing work in a desktop CAD environment rather than finishing the entire mechanical design inside the tool. The marketplace packaging also signals deployment as a design plugin style workflow rather than a full simulation suite.

KISSsoft concentrates on planetary gear train synthesis and sizing for sun–planet–ring architectures.

Gleason GEMS targets planetary gear train synthesis and design for engineers working from Gleason gear technologies, with emphasis on generating gear geometry inputs that drive analysis and manufacturing readiness. The workflow focuses on tooth selection, profile-shape parameters like pressure angle, and gear mesh geometry so the design can move from sizing to durability checks.

MASTA at smartmt.com runs planetary gear train design calculations and generates synthesis results for sun planet ring architectures. The workflow focuses on tooth-count selection, kinematic analysis, and downstream geometry outputs needed for gear mesh definition.

GearTeq targets planetary gear train synthesis and kinematic analysis, then pushes the results into gear sizing workflows built around sun, planet, and ring architecture. The distinct part is a gear-teardown style workflow that couples tooth-count selection logic with gear mesh geometry inputs so geometry decisions trace back to the train concept.

MESYS Shaft Calculation centers on shaft and drivetrain sizing workflows rather than full planetary train synthesis inside one continuous CAD-to-rating loop. The tool supports parametric calculation inputs that convert gear and shaft geometry choices into stress, deformation, and strength checks tied to rotating parts.