# StudyTodo vs Retain

The clearest difference is ads: Retain at none against StudyTodo's shown. StudyTodo's advantage is device support (3 vs 1). On price, in-app purchases and iOS requirement there is nothing between them.

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

## The numbers

| Metric | StudyTodo | Retain |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 10 days | — |
| Size | 39 MB | 43 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Tatsuya Sato](https://appshunter.io/developer/1879974502) | [HonestyVision](https://appshunter.io/developer/1804536258) |

## What reviewers say

### StudyTodo

[App page](https://appshunter.io/ios/app/studytodo/id6759635529)

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

**In-app purchases:** none


### Retain

[App page](https://appshunter.io/ios/app/retain-revision-tracker/id6799671289)

**In-app purchases:** none


## Frequently asked questions

### Is StudyTodo free?

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

### Is Retain free?

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

### Do StudyTodo or Retain have ads?

StudyTodo shows ads; Retain does not.

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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.*