Water Requirement vs HydroDay
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Water Requirement
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This is an app that lets you easily and simply record your hydration. You can obtain the temperature and humidity of your current location and use them as a reference for the amount of hydration you need for that day. Why not start recording your hydration volume today to maintain your health? ・Simple and easy-to-read screen ・No complicated operations ・Records hydration intake up to one month in advance ・Automatically displays weather information for your current location. On hot or dry days, the amount of water lost through sweating increases. Try to drink more water.
HydroDay
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HydroDay : A Minimal, Private Hydration Tracker This is a simple yet precise hydration tracking app designed to help you understand your daily drinking habits No accounts, no cloud, no tracking — all data stays securely on your device Stay hydrated, build healthy habits, and see your progress across days, weeks, and months. - Beautiful & Effortless Tracking - Quick input for instant logging - Intuitive icons for different cup sizes Clean daily dashboard that updates automatically Weekly & Monthly Insights - Visual summaries that reveal your hydration patterns - Goal vs. actual tracking for each day - Tap into any date to view detailed logs Edit & Delete Anytime - Fix incorrect entries in one tap - Easily adjust past records Privacy You Can Trust - All data is stored only on your device - Works fully offline - Your hydration journey is yours alone
Screenshots
Verdict
Water Requirement and HydroDay are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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.
| Parameter | Water Requirement | HydroDay |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 months | — |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 16.2 — better | 17.0 |
| Further details — not scored | ||
| Size | 17 MB | 37 MB |
| Age rating | 12+ | 4+ |
| Developer | Yuta Endo | Geonung Cheong |
In-app purchases
Water Requirement
No in-app purchases
HydroDay
No in-app purchases









