No. 13 of 59 ·Motion Capture Software

OpenCap

Web · iPhone

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Freedom report

Two barsScore 6.4

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely2 of 6 device platforms
DocumentedPlans, terms and facts published

OpenCap is ranked #13 of 59 in motion capture software on Freedom251. It runs on iOS, Web. There is a free plan.

OpenCap plans and pricing

All plans

OpenCap Free Free for academic or nonprofit non-commercial research or educational use · commercial entities must contact the authors opencap.ai · 5 Oct 2026

Compared on motion capture software

Free plan: Yes
Body tracking: Yes
Export formats: JSON, TRC, MOT
Supported platforms: iOS, Web

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The record

Purpose: OpenCap estimates 3D human movement kinematics and forces from smartphone video for biomechanical analysis.
Capture modes: It offers multi-camera capture and a beta monocular setup that records with one iPhone.
Outputs: The platform provides joint angles, moments, and muscle forces through musculoskeletal dynamics.
Workflow: Users record with iOS devices, review and download data through a web app, and process videos on cloud servers.
Analysis utilities: OpenCap provides Python utilities for further analysis, including estimating kinetics.
Use cases: The site lists walking, sit-to-stand, squats, drop jumps, treadmill running, and jumping as example movement analyses.
Validation: The maker says OpenCap has been validated against marker-based systems.
Security: The maker says data is encrypted in transit and at rest and that its infrastructure is HIPAA-compatible.
Data access: OpenCap's terms say the development team can view submitted data, including videos, and may use it for algorithm development.
Data sharing: Investigators must obtain participant consent, and participants can choose among several levels of public data sharing, including no public sharing.
Commercial use: The service terms prohibit use by commercial entities, including for research, and direct interested entities to contact the authors.
Device requirements: The multi-camera instructions require at least two iOS devices and say iPhones, iPads, and iPods released in 2018 or later are supported.
Monocular requirements: The monocular instructions require one iPhone for recording and say no calibration step is needed.
Support: The contact page directs technical questions to the multi-camera or monocular forums before emailing and says Android is not supported.
Price from: Free

Where it ranks on Freedom251

Best Motion Capture Software in 2026#13 of 59

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Sources

opencap.ai· checked 5 Oct 2026
opencap.ai/terms-conditions· checked 5 Oct 2026
opencap.ai/get-started· checked 5 Oct 2026
opencap.ai/get-started· checked 5 Oct 2026
opencap.ai/contact· checked 5 Oct 2026