# М99 Test vs Open Bridge

The clearest difference is update cadence: Open Bridge at every 5 weeks against М99 Test's every 2 months. М99 Test's advantage is iOS requirement (9.0 vs 16.4). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

М99 Test ships an update every 2 months, Open Bridge every 5 weeks. The most recent releases landed on October 16, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | М99 Test | Open Bridge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/open-bridge/id1578358408/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | — | Free |
| Size | 26 MB | 41 MB |
| Requires iOS | **9.0** | 16.4 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [REMspace inc.](https://appshunter.io/developer/902926761) | [Sage Bionetworks, a Not-For-Profit Research Organization](https://appshunter.io/developer/972180603) |

## What reviewers say

### М99 Test

[App page](https://appshunter.io/ios/app/99-test/id1543843761)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is М99 Test free?

М99 Test is free to download, with no in-app purchases.

### Is Open Bridge free?

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

### Do М99 Test or Open Bridge have ads?

Neither М99 Test nor Open Bridge shows ads.

### Which is updated more often, М99 Test or Open Bridge?

М99 Test ships an update every 2 months, and Open Bridge every 5 weeks. Most recently, М99 Test was updated on October 16, 2026 and Open Bridge on October 6, 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.*