# マイメダカ日記 vs JoyFish

The clearest difference is in-app purchases: マイメダカ日記 at none against JoyFish's 2. マイメダカ日記 also leads on device support (3 vs 1) and iOS requirement (10.0 vs 17.0). JoyFish's advantage is update cadence (monthly vs every 11 months). On price and ads there is nothing between them.

Both are free to download. JoyFish sells 2 in-app purchases, starting at $0.99 per month. マイメダカ日記 asks for nothing beyond the download.

マイメダカ日記 ships an update every 11 months, JoyFish monthly. The most recent releases landed on October 26, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | マイメダカ日記 | JoyFish |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Monthly** |
| Size | 13 MB | 8 MB |
| Requires iOS | **10.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Satoru Nakamura](https://appshunter.io/developer/1242833473) | [笛 姜](https://appshunter.io/developer/1561507357) |

## What reviewers say

### マイメダカ日記

[App page](https://appshunter.io/ios/app/id1307960112)

**Features:** macOS Compatibility

**In-app purchases:** none


### JoyFish

[App page](https://appshunter.io/ios/app/joyfish-growth-tracker/id6736854347)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $0.99 | per month |
| Lifetime Premium | $3.99 | one-time |


## Frequently asked questions

### Is マイメダカ日記 free?

マイメダカ日記 is free to download, with no in-app purchases.

### Is JoyFish free?

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

### Do マイメダカ日記 or JoyFish have ads?

Neither マイメダカ日記 nor JoyFish shows ads.

### Which is updated more often, マイメダカ日記 or JoyFish?

マイメダカ日記 ships an update every 11 months, and JoyFish monthly. Most recently, マイメダカ日記 was updated on October 26, 2026 and JoyFish 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.*