FastOnce vs Water
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FastOnce
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One giant button. That is the whole app. Tap it to start a fast, tap it to end. A real 24-hour clock face shows exactly where your fast sits in the day, not an abstract bar. Available in English, Spanish, French, Arabic, Russian, Hindi and Ukrainian. RAMADAN Switch on Ramadan mode and the timer stops being a number of hours you picked. Your fast runs from suhoor to iftar, worked out on the phone for wherever you are, and both times move a few minutes every day exactly as they really do. Six calculation methods: Umm al-Qura, Dubai, the Egyptian General Authority, the Muslim World League, Karachi and North America. The one used where you are is chosen for you. Everything is computed on the device from your location, so it works with no signal at all and nothing is sent anywhere. Ramadan mode appears in the app as the month comes round. WHY FASTONCE Nearly every fasting app rents you a timer. You answer a quiz, hand over an email, then pay monthly for a clock. FastOnce asks for none of that. No account, no sign-up, and it opens straight onto the button. WHAT YOU GET, FREE A dial that actually reads as time The ring wraps a 24-hour wall clock, so you can see at a glance that your fast ends at 8pm rather than decoding a percentage. Plans that fit your day 12:12, 14:10, 16:8, 18:6, 20:4 and OMAD, or set your own hours. You can also pick the time you want to finish and the length is worked out for you. It keeps going by itself When your fast ends the eating window opens, and when that closes the next fast begins. Weeks can pass without opening the app. Forgot to hit start Backdate the start time and the ring, the stages and every reminder recalculate instantly. Stages, explained in plain language Blood sugar drop, fat burning, ketosis and autophagy, each with a short friendly explanation. No clinical claims, no scare tactics. Your calendar, your streaks, your totals A month calendar of completed fasts, current and longest streaks, and your totals. Free, and staying free. Gentle nudges, only if you want them Optional pings at the halfway mark, at each stage, when your fast completes, and short encouragement while you are in it. Quiet overnight. A home-screen widget Your current fast at a glance without opening anything. FASTONCE PRO, ONE PAYMENT Pro is a single purchase. No subscription, nothing renews. It adds three things and nothing else: Charts and trends Hours per day, how often you reach your goal, your weekly average, and the hour you actually start. Export your log Every fast you have finished, as a spreadsheet file that leaves the app and is yours to keep. Still no account, still offline Pro changes what you can see, not where it lives. PRIVACY No account, no analytics, no advertising, no server of ours. Nothing you record ever leaves your iPhone, and neither does your location. The only time FastOnce talks to anything is when you buy Pro, which goes through the App Store. FastOnce shares general wellbeing information, not medical advice. Talk to a doctor before changing your eating habits.
Water
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Water is a calm, beautifully designed water tracker built around a real fluid surface that tilts as you move your phone and ripples every time you log a drink. No clutter and no noise, just a living glass of water that fills up as you hit your daily goal. FEATURES - One tap logging: quick-add buttons plus a Custom sheet for exact amounts, with your own presets - Smart reminders: gentle notifications spread through the day, tuned to how much water you still need - Full water log: every entry grouped by day, swipe to delete, tap a day to see the details - Monthly calendar: progress rings show how consistent your hydration habit really is - Metric and imperial units: switch between milliliters and US fluid ounces anytime - Personal profile: age, weight and height help put your daily goal in context - Clean white journal: today's log and the monthly calendar live in a crisp white sheet that glides up from the bottom - Native iOS design: Liquid Glass buttons, haptic feedback on every tap, smooth spring animations throughout WHY WATER Most hydration trackers are noisy: streak counters, badges, social feeds. Water strips all that away and keeps the one thing that matters, how close you are to your goal right now, shown as an actual body of water that moves, catches light and responds to your phone's tilt. It is a water tracker and drink reminder built to feel calm to look at, every single day. Set your daily water intake goal in milliliters or ounces, pick a reminder schedule, and let Water do the rest. Your data stays on your device.
Screenshots
Verdict
FastOnce and Water are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases 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.
FastOnce ships an update every 6 days, Water weekly. The most recent releases landed on September 9, 2026 and September 13, 2026 respectively.
| Parameter | FastOnce | Water |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 6 days — better | Weekly |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone | iPhone |
| Requires iOS | 17.0 | 16.4 — better |
| Further details — not scored | ||
| Size | 6 MB | 39 MB |
| Age rating | 4+ | 4+ |
| Developer | Andrii Zakharov | Supafast Tech LLC |
In-app purchases
FastOnce
No in-app purchases
Water
No in-app purchases









