Comparison

Waterfaster vs WaterFast

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

Head to head
About

Waterfaster

Features
Read full description

Water fasting and intermittent fasting, made clear — and no longer something you do alone. Start a fast with one tap and watch the live countdown on your Lock Screen, in the Dynamic Island and on your Home Screen widget. Follow what your body is doing hour by hour — fat burning, ketosis, cellular regeneration — based on published research. FAST TOGETHER — ANONYMOUS BY DESIGN • Live: see how many people are fasting with you right now • Your Circle: add friends with a simple code, follow their fast live, send boosts and friendly nudges • Groups & challenges: chase one goal together — from a 16:8 streak to a 7-day reset • No profiles, no photos, no feed of strangers. You appear under a generated water name unless you choose otherwise. YOU DECIDE WHO SEES YOU Share everything, hide from one specific friend, or go invisible completely. One tap, any time. NEVER LOSE YOUR PROGRESS Link Apple or Google and restore your history, stats and circle on any device. PICK YOUR PROTOCOL • Intermittent: 12:12, 14:10, 16:8, 18:6, 20:4 and OMAD • Water fasting: 24h, 36h, 48h, 72h, 4, 5 and 7 days • Flex: set or move your finish time while the fast is running ALSO INSIDE • Live Activity, Lock Screen and Home Screen widgets • Apple Health: steps, sleep, heart rate, weight and water • Hydration and electrolyte guidance during longer fasts • Streaks, trends and your full weight history • Personal insights and reminders you stay in control of Waterfaster is not medical advice. Talk to your doctor before longer fasts, and never fast on medication without medical guidance. — Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Terms of Service: https://waterfaster.app/terms Privacy Policy: https://waterfaster.app/privacy

About

WaterFast

This app provides a synchronized intermittent fasting timer designed for seamless use across your iPhone and Apple Watch. It offers detailed insights into fasting zones and hydration tracking, with a focus on privacy and a user-friendly experience.

Highlights
  • Synchronized iPhone and Apple Watch timer
  • Fasting zone insights
  • Hydration tracking
  • Multiple fasting plans
  • Streak calendar
  • Data export
Features
Read full description

Some fasting apps charge many times more. WaterFast is a fraction of that — with a 3-day free trial on every plan. You decide. FASTING APPS HAVE A PROBLEM They're either overpriced, bloated with social feeds and AI coaching you never asked for — or they're simple but their Apple Watch app runs a separate countdown that drifts out of sync with your iPhone. Two timers for the same fast. Not optimal. WATERFAST IS DIFFERENT One timer. One source of truth. Your Watch doesn't follow your iPhone — it leads. Start, monitor and end your fast right from your wrist, even with your iPhone in your pocket. When you pick it up, everything matches. Always. To the second. TRY IT ALL FREE FOR 3 DAYS Start a 3-day free trial and unlock everything — no strings attached. Then keep it monthly, yearly, or one-time lifetime. Cancel anytime. EVERYTHING INCLUDED • Every plan: 16:8, 18:6, 20:4, OMAD, 5:2 and fully custom • Start & stop fasts from Apple Watch — it leads, iPhone follows • Live timer with progress ring and fasting zones • Streak calendar — don't break the chain, unlimited history • All Apple Watch complications (circular, corner, inline, rectangular) • Hydration tracking with one-tap logging and daily goal • Full stats: current streak, longest fast, total hours, success rate • Export your data as CSV • No account required BUILT FOR APPLE WATCH — REALLY Most fasting apps treat the Watch as an afterthought. WaterFast was designed wrist-first. The timer state lives in one shared place: start a fast on your Watch during dinner, check the zone on your iPhone the next morning — same fast, same seconds, zero drift. KNOW YOUR FASTING ZONES Track exactly what's happening in your body — from digestion through fat burning and ketosis to autophagy. Each zone explained in plain language, with science-based hour ranges. Educational reference only — not medical advice. HYDRATION, ON YOUR WRIST Log a glass of water with one tap on your Watch, with haptic confirmation, synced instantly to your iPhone and Apple Health. A PRICE THAT RESPECTS YOU WaterFast PRO: monthly, yearly, or one-time lifetime. Every plan starts with a 3-day free trial. We think a fasting timer shouldn't cost more than your streaming service. PRIVATE BY DESIGN No account. No ads. No tracking. Your fasting and hydration data never leaves your device (except to your own Apple Health, if you choose). Start your 3-day free trial and run your first fast in under a minute. --- Medical disclaimer: WaterFast provides educational information about fasting. It is not medical advice. Consult your healthcare provider before starting any fasting protocol, especially if you have a medical condition, are pregnant, or take medication. --- Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Waterfaster4 screens
WaterFast4 screens

Verdict

The call

Waterfaster and WaterFast 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Waterfaster sells 3 in-app purchases, starting at $3.99 per 7 days and WaterFast sells 2 in-app purchases, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Waterfaster ships an update every 11 days, WaterFast weekly. The most recent releases landed on October 5, 2026 and October 6, 2026 respectively.

ScorecardNo meaningful differences
Waterfaster versus WaterFast: the parameters behind the verdict, then further details
ParameterWaterfasterWaterFast
PriceFreeFree
Rating—5.0 (2 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 11 daysWeekly — better
AdsNoNo
In-app purchasesYesYes
Monetization—Freemium
DevicesiPhoneiPhone, Apple Watch — better
Requires iOS16.4 — better17.0
Further details — not scored
Size59 MB3 MB
Age rating17+4+
DeveloperAMIT SolutionsLUIS ORLANDO LAZO GONZALEZ

In-app purchases

3 purchases

Waterfaster

Subscriptions2
  • Waterfaster+3 Days trial$3.997 Days
  • Waterfaster+$44.991 Year
One-time1
  • Lifetime$89.99
2 purchases

WaterFast

Subscriptions1
  • WaterFast PRO Yearly$9.991 Year
One-time1
  • WaterFast PRO Lifetime$24.99

Questions

Is Waterfaster free?
Waterfaster is free to download, with in-app purchases available.
Is WaterFast free?
WaterFast is free to download, with in-app purchases available.
Do Waterfaster or WaterFast have ads?
Neither Waterfaster nor WaterFast shows ads.
Which is updated more often, Waterfaster or WaterFast?
Waterfaster ships an update every 11 days, and WaterFast weekly. Most recently, Waterfaster was updated on October 5, 2026 and WaterFast on October 6, 2026.

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