OpenCap vs FITSystem
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OpenCap
Capture 3D human movement data using your iOS device's camera. Analyze biomechanics through a comprehensive system including an app, web platform, and cloud computing.
- 3D human movement capture
- iOS video recording
- Web-based data collection
- Biomechanical analysis
- Cloud computing integration
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OpenCap is a software system to measure 3D human movement from iOS device videos. It comprises an iOS app for video capture, a web app for data collection and visualization, and scalable cloud computing for biomechanical analysis from video.
FITSystem
This mobile application is designed for a specific research study, requiring specialized hardware for use. It is intended for participants involved in the NIH-funded research project.
- Research study participation
- Requires specialized hardware
- NIH-funded project integration
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This is a mobile application for a research study, NIH# 1R44HD114504-01A1 (https://reporter.nih.gov/search/XNP6X_5iVUqNwWVyJoAJHg/project-details/10920281). Using and testing the app requires hardware provided to research participants.
Screenshots
Verdict
The clearest difference is update cadence: FITSystem at fortnightly against OpenCap's every 7 months. OpenCap's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 17.6). On price, rating, ratings volume and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for OpenCap against 5.0 for FITSystem. Both are backed by a comparable volume of ratings — 4 and 2 respectively.
OpenCap ships an update every 7 months, FITSystem fortnightly. Both last shipped on September 8, 2026.
| Parameter | OpenCap | FITSystem |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) | 5.0 (2 ratings) |
| Number of ratings | 4 — better | 2 |
| Update frequency | Every 7 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 17.6 |
| Further details — not scored | ||
| Size | 6 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | Model Health, Inc. | NuRelm, Inc. |
Customer experience
OpenCap
FITSystem
In-app purchases
OpenCap
No in-app purchases
FITSystem
No in-app purchases
