Biru vs Mitasu
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Biru
This app offers a straightforward way to track your daily water intake. It features a clean interface, quick logging options, and home screen widgets for easy access. It also includes Apple Watch integration and optional Apple Health syncing.
- One-tap drink logging
- Customizable quick-add sizes
- Ad-free and subscription-free
- Apple Watch app and complications
- Home screen widgets
- Personalized daily goal suggestions
- Optional Apple Health sync
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I was looking for a simple water tracker. One that let me open the app, tap a button to add my drink, and get back to my life. What I found were apps filled with ads, cluttered dashboards, and constant pressure to buy a subscription. I wanted a tool, not a chore. So I built Biru. Biru is the water tracker I always wanted. It's built on one core idea: tracking your water should be fast, simple, and completely frustration-free. WHY BIRU IS DIFFERENT • NO CLUTTER, PURE FOCUS Your day is a single rising wave. Your total sits in the middle and inverts as the water covers it. That's the whole screen — nothing else gets in your way. • GET IN, GET OUT, GET HYDRATED Log a drink with one tap. Set up to three quick-add sizes to match the bottles and glasses you actually use, in millilitres or fluid ounces. You're done in seconds. • NO ADS. NO SUBSCRIPTIONS. NO PAYWALLS. Every feature in Biru is free, forever. There's an optional tip jar if you'd like to support development, but it unlocks nothing — the app is already complete without it. • ON YOUR WRIST Biru comes with a full Apple Watch app. Log a drink without your phone, pick another size, or check your week. Add a complication to any watch face — the large one shows the same rising water as the app. • ON YOUR HOME SCREEN Five widget styles in small and medium. Tap a size to log it without opening the app, or see your last seven days at a glance. Press and hold any widget to choose which sizes it offers. • A SIMPLE, SMART START Answer a few quick questions and Biru suggests a personal daily goal based on your weight, age, activity and climate. It's a starting point, not a rule — adjust it whenever you like. • OPTIONAL APPLE HEALTH SYNC Turn Health on and your drinks are saved alongside the rest of your data. Leave it off and Biru works exactly the same. • BUILT IN THE OPEN Biru has a roadmap inside the app. Suggest a feature, report a bug, vote on what matters to you, and see what's coming next. If you've been searching for a water tracker that respects your time and your focus, your search is over.
Mitasu
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Hydration that feels good. Mitasu is a simple tracker for your daily water intake, where every glass fills the whole screen with water. The level rises as you drink, and the scene shifts as you get closer to your goal. You don't count it. You fill it. A calm, ambient design that makes you want to drink a little more every time you look. —— ◆ Features ◎ An ambient water surface that rises as you drink ◎ A background that shifts with the time of day — morning, day, evening, night ◎ One-tap quick add, plus custom amounts for anything else ◎ Estimate your daily goal from your body weight ◎ Reminders within the hours you choose, so you never forget ◎ Apple Health integration that logs your water intake ◎ Monthly heatmap and weekly chart to review your habits (Pro) ◎ Log a glass in seconds from Apple Watch ◎ Home Screen and Lock Screen widgets show your progress ◎ Interactive logging from widgets and a Lock Screen Live Activity (Pro) ◎ Works in ml or fl oz —— ◆ Perfect For ・Anyone building a habit of drinking more water ・People who want to stay hydrated without chasing numbers ・Apple Health users who want their water data in one place ・Apple Watch owners who want to log a glass in seconds —— Don't count it. Fill it. Mitasu turns daily hydration into a calm, beautiful habit. —— Mitasu Pro (subscription) unlocks your full history beyond 3 days, monthly heatmaps, streaks, averages, custom reminders, and editable quick-add presets. Eligible new subscribers can start with a free trial. Plans renew automatically until canceled in App Store settings at least 24 hours before renewal. —— Terms of Use (EULA): https://rakko.app/mitasu-terms-and-conditions/ Privacy Policy: https://rakko.app/mitasu-privacy-policy/
Screenshots
Verdict
The clearest difference is update cadence: Mitasu at every 2 weeks against Biru's every 6 weeks. Biru's advantage is iOS requirement (18.5 vs 26.4). 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. Biru sells 3 one-off in-app purchases and Mitasu sells 2 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.
Biru ships an update every 6 weeks, Mitasu every 2 weeks. The most recent releases landed on November 5, 2026 and October 25, 2026 respectively.
| Parameter | Biru | Mitasu |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 6 weeks | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free | — |
| Devices | iPhone, Apple Watch | iPhone, Apple Watch |
| Requires iOS | 18.5 — better | 26.4 |
| Further details — not scored | ||
| Size | 6 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | JudeWorks | Rakko Inc. |
In-app purchases
Biru
- Tip a Drop$0.99
- Tip a Glass$2.99
- Tip a Bottle$4.99
Mitasu
- Mitasu Pro Weekly3 Days trial$2.997 Days
- Mitasu Pro Annual7 Days trial$29.991 Year









