# Open Bridge vs DietGen

The clearest difference is device support: DietGen at 3 against Open Bridge's 1. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly every 5 weeks. The most recent releases landed on September 18, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Open Bridge | DietGen |
| --- | --- | --- |
| 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 5 weeks | Every 5 weeks |
| Monetization | Free | — |
| Size | 41 MB | 82 MB |
| Requires iOS | 16.4 | **15.6** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Sage Bionetworks, a Not-For-Profit Research Organization](https://appshunter.io/developer/972180603) | [Yibin Wang](https://appshunter.io/developer/1851268866) |

## 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


### DietGen

[App page](https://appshunter.io/ios/app/dietgen/id6754987805)

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

**In-app purchases:** none


## Frequently asked questions

### Is Open Bridge free?

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

### Is DietGen free?

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

### Do Open Bridge or DietGen have ads?

Neither Open Bridge nor DietGen shows ads.

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

Open Bridge ships an update every 5 weeks, and DietGen every 5 weeks. Most recently, Open Bridge was updated on September 18, 2026 and DietGen on September 19, 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.*