# Aiboou vs Mitasu

The clearest difference is iOS requirement: Aiboou at 15.0 against Mitasu's 26.4. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Aiboou sells 1 in-app purchase, starting at $2.99 per month and Mitasu sells 2 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Aiboou ships an update every 9 days, Mitasu every 2 weeks. The most recent releases landed on October 5, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Aiboou | Mitasu |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 2 weeks |
| Size | 57 MB | 17 MB |
| Requires iOS | **15.0** | 26.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 17+ | 4+ |
| Developer | [Kento Fukui](https://appshunter.io/developer/852236897) | [Rakko Inc.](https://appshunter.io/developer/1453118449) |

## What reviewers say

### Aiboou

[App page](https://appshunter.io/ios/app/aiboou/id6783070809)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアムプラン | $2.99 | per month |


### Mitasu

[App page](https://appshunter.io/ios/app/mitasu-water-tracker/id6789154022)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mitasu Pro Weekly | $2.99 | per 7 days |
| Mitasu Pro Annual | $29.99 | per year |


## Frequently asked questions

### Is Aiboou free?

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

### Is Mitasu free?

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

### Do Aiboou or Mitasu have ads?

Neither Aiboou nor Mitasu shows ads.

### Which is updated more often, Aiboou or Mitasu?

Aiboou ships an update every 9 days, and Mitasu every 2 weeks. Most recently, Aiboou was updated on October 5, 2026 and Mitasu on October 2, 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.*