Comparison

HydroRing vs MIZU 水分記録・水を飲むリマインダー

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

HydroRing

Read full description

Tap once to log a drink and watch your ring fill up. See how much water you've had today at a glance. A simple hydration tracker that's easy to stick with, even on busy days. KEY FEATURES - One-tap logging: set your favorite amounts as buttons, or enter a custom amount - Progress ring: turns gold when you go past your goal - See how much is left to reach today's goal - Choose what you're drinking (water, tea and more) - Confetti and haptics when you hit your goal - Daily streaks and 13 badges to earn - Calendar view of your past days - Weekly chart, average intake, goal days and best streak - Reminder notifications at the times you choose - Daily goal from 500 ml to 5000 ml - Switch between ml and oz - Available in English and Japanese GREAT FOR - Anyone who gets busy and forgets to drink water - Building a daily water habit - Seeing how coffee and tea fit into your day - People who gave up on trackers that ask for too much input - Staying on top of your water intake in hot or dry weather PRIVACY - No account needed - Your logs are stored only on your iPhone or iPad and are never sent to a server - No tracking - To show our other apps, the app reads public App Store information (your logs are never sent) PLEASE NOTE HydroRing is a wellness app for logging everyday drinks. It is not a medical device or a medical app. Please talk to a doctor or other qualified professional about your health.

About

MIZU 水分記録・水を飲むリマインダー

Features
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■ MIZU は、水を飲む習慣をつくるための、シンプルな水分記録アプリです 飲んだらタップするだけ。 今日の水分量がリングで満ちていき、目標までの残りがひと目でわかります。 【できること】 ・ワンタップで記録(200ml / 350ml / 500ml) ・押し間違えても、すぐ取り消せます ・今日の合計と目標達成率をリングで表示 ・決めた時間帯に、決めた間隔でリマインダー通知 ・7日 / 14日 / 30日のグラフで振り返り ・1日平均・達成した日数・連続達成日数がわかります ・目標量は 1,000〜4,000ml のあいだで自由に設定 【こんな方に】 ・水を飲むのをつい忘れてしまう方 ・毎日の水分量を記録しておきたい方 ・むくみや体調管理が気になる方 ・トレーニングやダイエット中の方 ・シンプルで見やすい水分記録アプリをお探しの方 【安心ポイント】 ・記録はすべて端末の中に保存されます ・会員登録・ログインは不要です ・ユーザーのトラッキングは行いません 【広告なし版について】 アプリ内の「広告なしにする」から一度お買い上げいただくと、 広告が消え、アクセントカラーの変更と記録の書き出し(CSV)が使えるようになります。 今日から、水を飲む習慣を。 お問い合わせ: kk.apps.support@gmail.com

Screenshots

HydroRing4 screens
MIZU 水分記録・水を飲むリマインダー3 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 4 level
HydroRing versus MIZU 水分記録・水を飲むリマインダー: the parameters behind the verdict, then further details
ParameterHydroRingMIZU 水分記録・水を飲むリマインダー
PriceFreeFree
Update frequencyEvery 6 weeksEvery 9 days — better
AdsNo — betterYes
In-app purchasesYesYes
DevicesiPhone, iPad — betteriPhone
Requires iOS16.0 — better17.6
Further details — not scored
Size2 MB1 MB
Age rating4+4+
DevelopertorankiriteKenichi Kato

In-app purchases

1 purchases

HydroRing

One-time1
  • HydroRing Premium$3.99
1 purchases

MIZU 水分記録・水を飲むリマインダー

One-time1
  • 広告なし+全機能$1.99

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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