# URUOI vs みずたま

The clearest difference is in-app purchases: みずたま at none against URUOI's 3. みずたま also leads on update cadence (every 3 days vs every 10 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. URUOI sells 3 in-app purchases, starting at $0.99 per month. みずたま asks for nothing beyond the download.

URUOI ships an update every 10 days, みずたま every 3 days. The most recent releases landed on September 10, 2026 and August 31, 2026 respectively.

## The numbers

| Metric | URUOI | みずたま |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 3 days** |
| Monetization | — | Free |
| Size | 17 MB | 63 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [HeberekeKomachi](https://appshunter.io/developer/1868863528) | [Hayato Tsuchikawa](https://appshunter.io/developer/1863967283) |

## What reviewers say

### URUOI

[App page](https://appshunter.io/ios/app/uruoi/id6757776163)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| もっとURUOIプラン（月額） | $0.99 | per month |
| もっとURUOIプラン（年額） | $9.99 | per year |
| ずっと！URUOIプラン | $49.99 | one-time |


### みずたま

[App page](https://appshunter.io/ios/app/id6765880982)

This app helps you stay hydrated by tracking your water intake with a cute, interactive companion. It gamifies the process with a character that reacts to your progress, making hydration fun and motivating. Enjoy a visually pleasing and minimalist experience focused solely on water consumption.

**Highlights:** Interactive character that reacts to hydration progress, Customizable reminders, Home screen widgets, Daily, weekly, and monthly statistics, Streak tracking, Preset drink registration, Data privacy focused

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

**In-app purchases:** none


## Frequently asked questions

### Is URUOI free?

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

### Is みずたま free?

みずたま is free to download, with no in-app purchases.

### Do URUOI or みずたま have ads?

Neither URUOI nor みずたま shows ads.

### Which is updated more often, URUOI or みずたま?

URUOI ships an update every 10 days, and みずたま every 3 days. Most recently, URUOI was updated on September 10, 2026 and みずたま on August 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.*