Comparison

HydroRing vs MizuApp

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

MizuApp

Features
Read full description

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 ・定期リマインダーで水分補給を忘れない(時間帯設定可) ・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。

Screenshots

HydroRing4 screens
MizuApp4 screens

Verdict

The call

The clearest difference is in-app purchases: MizuApp at none against HydroRing's 1. On price, update cadence, ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. HydroRing sells 1 one-off in-app purchase. MizuApp asks for nothing beyond the download.

UpkeepUpdate frequency

HydroRing ships an update every 6 weeks, MizuApp monthly. The most recent releases landed on October 17, 2026 and October 19, 2026 respectively.

Scorecard1 real difference · 5 level
HydroRing versus MizuApp: the parameters behind the verdict, then further details
ParameterHydroRingMizuApp
PriceFreeFree
Update frequencyEvery 6 weeksMonthly — better
AdsNoNo
In-app purchasesYesNo — better
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.0 — better16.4
Further details — not scored
Size2 MB37 MB
Age rating4+4+
Developertorankiritemaoko

In-app purchases

1 purchases

HydroRing

One-time1
  • HydroRing Premium$3.99
None

MizuApp

No in-app purchases

Questions

Is HydroRing free?
HydroRing is free to download, with in-app purchases available.
Is MizuApp free?
MizuApp is free to download, with no in-app purchases.
Do HydroRing or MizuApp have ads?
Neither HydroRing nor MizuApp shows ads.
Which is updated more often, HydroRing or MizuApp?
HydroRing ships an update every 6 weeks, and MizuApp monthly. Most recently, HydroRing was updated on October 17, 2026 and MizuApp on October 19, 2026.

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