# Future Swim vs CatAche Diary

The clearest difference is in-app purchases: Future Swim at none against CatAche Diary's 1. CatAche Diary's advantage is update cadence (every 4 days vs every 3 weeks) and iOS requirement (13.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. CatAche Diary sells 1 one-off in-app purchase. Future Swim asks for nothing beyond the download.

Future Swim ships an update every 3 weeks, CatAche Diary every 4 days. The most recent releases landed on November 8, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Future Swim | CatAche Diary |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Size | 59 MB | 27 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Future Swim](https://appshunter.io/developer/1825190568) | [Stefanus van de Wetering](https://appshunter.io/developer/1883002799) |

## What reviewers say

### Future Swim

[App page](https://appshunter.io/ios/app/future-swim/id6748323426)

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

**In-app purchases:** none


### CatAche Diary

[App page](https://appshunter.io/ios/app/catache-diary-headache-log/id6760231940)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Upgrade | $1.99 | one-time |


## Frequently asked questions

### Is Future Swim free?

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

### Is CatAche Diary free?

CatAche Diary is free to download, with in-app purchases available.

### Do Future Swim or CatAche Diary have ads?

Neither Future Swim nor CatAche Diary shows ads.

### Which is updated more often, Future Swim or CatAche Diary?

Future Swim ships an update every 3 weeks, and CatAche Diary every 4 days. Most recently, Future Swim was updated on November 8, 2026 and CatAche Diary on November 5, 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.*