MizuApp vs Waterday
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MizuApp
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日本の生活に合わせた水分補給トラッカーです。 【主な機能】 ・麦茶・緑茶・烏龍茶・スポーツドリンクなど日本の飲み物に対応 ・500mlペットボトル・350ml缶など日本の一般的なサイズをデフォルト設定 ・水グラスのアニメーションで達成度を視覚的に表示 ・過去7日間のグラフで摂取量を確認 ・1日の目標量をカスタマイズ(1500〜3000ml) 【熱中症対策に】 夏の熱中症予防に、こまめな水分補給をサポートします。 すべてのデータは端末内に保存されます。
Waterday
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Waterday is a simple water tracker. Log every drink with one tap and see how close you are to today's goal on a clear progress ring. One-tap logging Log a cup, mug, or bottle from the presets, or enter a custom amount. Your daily total updates instantly. Goal and progress at a glance A progress ring shows how much of today's goal you've reached, with a little celebration when you hit it. Stay motivated Look back on your hydration with a weekly chart, a monthly heatmap, your goal streak, and your average intake. Home-screen widgets Add a progress-ring widget, or a one-tap logging widget, right on your Home Screen. Reminders Get gentle reminders at a set interval through your waking hours so you never forget to drink. Private by design No account required. Your data stays on your device. Supports ml and fl oz, Dark Mode, and iPad.
Screenshots
Verdict
The clearest difference is update cadence: Waterday at every 3 days against MizuApp's monthly. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
MizuApp ships an update monthly, Waterday every 3 days. The most recent releases landed on November 9, 2026 and October 31, 2026 respectively.
| Parameter | MizuApp | Waterday |
|---|---|---|
| Price | Free | Free |
| Update frequency | Monthly | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.4 — better | 17.0 |
| Further details — not scored | ||
| Size | 37 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | maoko | Daisuke Minami |
In-app purchases
MizuApp
No in-app purchases
Waterday
No in-app purchases









