# Waterday vs MIZU 水分記録・水を飲むリマインダー

The clearest difference is in-app purchases: Waterday at none against MIZU 水分記録・水を飲むリマインダー's 1. Waterday also leads on ads (none vs shown) and update cadence (every 3 days vs every 9 days). On price, device support and iOS requirement there is nothing between them.

Both are free to download. MIZU 水分記録・水を飲むリマインダー sells 1 one-off in-app purchase. Waterday asks for nothing beyond the download.

Waterday ships an update every 3 days, MIZU 水分記録・水を飲むリマインダー every 9 days. The most recent releases landed on November 10, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Waterday | MIZU 水分記録・水を飲むリマインダー |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 days** | Every 9 days |
| Size | 8 MB | 1 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Daisuke Minami](https://appshunter.io/developer/1762826742) | [Kenichi Kato](https://appshunter.io/developer/6780769174) |

## What reviewers say

### Waterday

[App page](https://appshunter.io/ios/app/waterday-water-tracker/id6792476155)

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

**In-app purchases:** none


### 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 Waterday free?

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

### 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 Waterday 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; Waterday does not.

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

Waterday ships an update every 3 days, and MIZU 水分記録・水を飲むリマインダー every 9 days. Most recently, Waterday was updated on November 10, 2026 and MIZU 水分記録・水を飲むリマインダー on November 6, 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.*