# OpenCap vs FITSystem

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.

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.

## The numbers

| Metric | OpenCap | FITSystem |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (4 ratings)](https://appshunter.io/ios/app/opencap/id1630513242/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/fitsystem/id6747683029/reviews) |
| Number of ratings | **4** | 2 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Fortnightly** |
| Monetization | Free | Free |
| Size | 6 MB | 33 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Model Health, Inc.](https://appshunter.io/developer/1252127888) | [NuRelm, Inc.](https://appshunter.io/developer/1133984813) |

## What reviewers say

### OpenCap

[App page](https://appshunter.io/ios/app/opencap/id1630513242)

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.

**Highlights:** 3D human movement capture, iOS video recording, Web-based data collection, Biomechanical analysis, Cloud computing integration

**In-app purchases:** none


### FITSystem

[App page](https://appshunter.io/ios/app/fitsystem/id6747683029)

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.

**Highlights:** Research study participation, Requires specialized hardware, NIH-funded project integration

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is OpenCap free?

OpenCap is free to download, with no in-app purchases.

### Is FITSystem free?

FITSystem is free to download, with no in-app purchases.

### Which has better reviews, OpenCap or FITSystem?

OpenCap and FITSystem are both rated 5.0 out of 5 on the App Store, from 4 and 2 ratings respectively.

### Do OpenCap or FITSystem have ads?

Neither OpenCap nor FITSystem shows ads.

### Which is updated more often, OpenCap or FITSystem?

OpenCap ships an update every 7 months, and FITSystem fortnightly. Most recently, OpenCap was updated on September 8, 2026 and FITSystem on September 8, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*