# HydroRing vs MIZU 水分記録・水を飲むリマインダー

The clearest difference is ads: HydroRing at none against MIZU 水分記録・水を飲むリマインダー's shown. MIZU 水分記録・水を飲むリマインダー's advantage is update cadence (every 9 days vs every 6 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. HydroRing sells 1 one-off in-app purchase and MIZU 水分記録・水を飲むリマインダー sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

HydroRing ships an update every 6 weeks, MIZU 水分記録・水を飲むリマインダー every 9 days. The most recent releases landed on October 17, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | HydroRing | MIZU 水分記録・水を飲むリマインダー |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 9 days** |
| Size | 2 MB | 1 MB |
| Requires iOS | **16.0** | 17.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [torankirite](https://appshunter.io/developer/1883564850) | [Kenichi Kato](https://appshunter.io/developer/6780769174) |

## What reviewers say

### HydroRing

[App page](https://appshunter.io/ios/app/hydroring-water-tracker/id6760393366)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HydroRing Premium | $3.99 | one-time |


### MIZU 水分記録・水を飲むリマインダー

[App page](https://appshunter.io/ios/app/mizu/id6797004270)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告なし＋全機能 | $1.99 | one-time |


## Frequently asked questions

### Is HydroRing free?

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

### Is MIZU 水分記録・水を飲むリマインダー free?

MIZU 水分記録・水を飲むリマインダー is free to download, with in-app purchases available.

### Do HydroRing or MIZU 水分記録・水を飲むリマインダー have ads?

MIZU 水分記録・水を飲むリマインダー shows ads; HydroRing does not.

### Which is updated more often, HydroRing or MIZU 水分記録・水を飲むリマインダー?

HydroRing ships an update every 6 weeks, and MIZU 水分記録・水を飲むリマインダー every 9 days. Most recently, HydroRing was updated on October 17, 2026 and MIZU 水分記録・水を飲むリマインダー on October 9, 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.*