# Open Bridge vs BiAffect3

The clearest difference is update cadence: Open Bridge at every 5 weeks against BiAffect3's every 4 months. 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 Open Bridge against 4.9 for BiAffect3. Both are backed by a comparable volume of ratings — 5 and 7 respectively.

Open Bridge ships an update every 5 weeks, BiAffect3 every 4 months. The most recent releases landed on October 6, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Open Bridge | BiAffect3 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/open-bridge/id1578358408/reviews)** | [4.9 (7 ratings)](https://appshunter.io/ios/app/biaffect3/id6451423106/reviews) |
| Number of ratings | 5 | **7** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 4 months |
| Monetization | Free | Free |
| Size | 41 MB | 30 MB |
| Requires iOS | 16.4 | **16.1** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Sage Bionetworks, a Not-For-Profit Research Organization](https://appshunter.io/developer/972180603) | [University of Illinois](https://appshunter.io/developer/422670617) |

## What reviewers say

### Open Bridge

[App page](https://appshunter.io/ios/app/open-bridge/id1578358408)

Contribute your data to scientific research studies focused on cognition. Complete scheduled activities, similar to puzzles or memory tests, directly on your phone. Your identity is protected as the app collects data solely for research purposes.

**Highlights:** Contribute data for research studies, Complete scheduled cognitive activities, Activities resemble puzzles and memory tests, Data used solely for research, Protects user identity, Developed by non-profit research organizations

**In-app purchases:** none


### BiAffect3

[App page](https://appshunter.io/ios/app/biaffect3/id6451423106)

This app helps you track your mood and cognitive function using your iPhone's keyboard and sensor data. It analyzes typing patterns to provide insights into mental health and assists researchers in developing better diagnostic tools for mood disorders.

**Highlights:** Mood tracking, Neurocognitive functioning assessment, Keystroke dynamics analysis, Sensor data collection, Mental health insights, Research participation

**In-app purchases:** none


## Frequently asked questions

### Is Open Bridge free?

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

### Is BiAffect3 free?

BiAffect3 is free to download, with no in-app purchases.

### Which has better reviews, Open Bridge or BiAffect3?

Open Bridge is rated higher. Open Bridge averages 5.0 out of 5 from 5 ratings, while BiAffect3 averages 4.9 from 7 ratings.

### Do Open Bridge or BiAffect3 have ads?

Neither Open Bridge nor BiAffect3 shows ads.

### Which is updated more often, Open Bridge or BiAffect3?

Open Bridge ships an update every 5 weeks, and BiAffect3 every 4 months. Most recently, Open Bridge was updated on October 6, 2026 and BiAffect3 on October 24, 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.*