# My Body Log vs UnDo

The clearest difference is in-app purchases: UnDo at none against My Body Log's 3. UnDo also leads on update cadence (weekly vs every 4 weeks) and iOS requirement (17.6 vs 26.0). My Body Log's advantage is device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. My Body Log sells 3 one-off in-app purchases. UnDo asks for nothing beyond the download.

My Body Log ships an update every 4 weeks, UnDo weekly. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | My Body Log | UnDo |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Weekly** |
| Size | 15 MB | 2 MB |
| Requires iOS | 26.0 | **17.6** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Atadore](https://appshunter.io/developer/1339696719) | [朝峰 陈](https://appshunter.io/developer/1868597907) |

## What reviewers say

### My Body Log

[App page](https://appshunter.io/ios/app/my-body-log/id6755067687)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Thanks | $2.99 | one-time |
| Thanks | $5.99 | one-time |
| Big Thanks | $9.99 | one-time |


### UnDo

[App page](https://appshunter.io/ios/app/undo/id6761196951)

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

**In-app purchases:** none


## Frequently asked questions

### Is My Body Log free?

My Body Log is free to download, with in-app purchases available.

### Is UnDo free?

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

### Do My Body Log or UnDo have ads?

Neither My Body Log nor UnDo shows ads.

### Which is updated more often, My Body Log or UnDo?

My Body Log ships an update every 4 weeks, and UnDo weekly. Most recently, My Body Log was updated on October 30, 2026 and UnDo on October 31, 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.*