Comparison

StayFasted vs Vow Fasting

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

Head to head
About

StayFasted

Features
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StayFasted is the fasting app that actually keeps you going. Most fasts don't end because of the plan. They end in one hard half hour. StayFasted is built around that half hour: a timer you can trust, a guide to what to expect, and a check-in that answers back. A TIMER FOR EVERY FAST 16:8 Ā· 18:6 Ā· 20:4 Ā· One Meal a Day Ā· 36h Ā· 48h Ā· 72h. One button starts it. Forgot to start? Move the start time in seconds. Your fast also shows on your Lock Screen, in the Dynamic Island, in widgets and on Apple Watch. KNOW WHAT TO EXPECT, HOUR BY HOUR For each part of a fast: what is generally understood, what people often feel, and what tends to help. Timing differs from person to person. General information, not medical advice. CHECK IN WHEN IT GETS HARD Mood, hunger and energy in a few taps. With Pro, an AI replies to what you wrote, how you feel and why you started. It runs on your iPhone, and it never pushes you to carry on. BREATHE Short breathing sessions for the moment a craving arrives, and a guided deep rest for when you need to lie down for ten minutes. On your phone and on your wrist. FLUIDS AND ELECTROLYTES Log water, coffee and tea in one tap. See whether you are keeping an even pace through the day. Electrolyte reminders for longer fasts. END IT WELL Stop whenever you choose. A refeed guide walks you back to food gently, from liquids to normal meals. SEE YOUR PATTERNS Insights in plain words from your own data, always honest about how much data they are based on. Progress photos on a timeline. A monthly report you can share with your doctor or coach. APPLE WATCH See your fast, start or end it, log water, check in and breathe. APPLE HEALTH Optional. Reads weight, steps, sleep, resting heart rate and active energy. Saves weight, water and mindful minutes. You choose what to share. YOUR FASTING DATA STAYS ON YOUR PHONE No account and no sign-up. Your fasts, check-ins, photos and notes are stored on your iPhone. Three optional features use the internet, only if you turn them on: weather, scanning a drink's barcode, and Apple Music playlists. FREE - Timer for every fasting length - The hour-by-hour guide - Check-ins, fluid tracking and the refeed guide - Two breathing sessions - Apple Watch, widgets and Live Activities - Your last 10 fasts and 7 days of charts PRO - AI replies on every check-in - All breathing sessions and deep rest - Full analytics and a monthly report with PDF - Unlimited history, journal, measurements and supplements - Rhythm planner, drink scanner, photo comparison - Health Labs scanner for InBody, DEXA and blood panels - CSV export Pro: $5.99 a month or $39.99 a year. Lifetime: $49.99, one payment. StayFasted gives general information about fasting and is not medical advice. Talk to your doctor before you start fasting, especially if you are pregnant, under 18, have diabetes or an eating disorder, or take medication. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdevstandard/ Privacy Policy: https://stayfasted.app/privacy

About

Vow Fasting

Read full description

Vow is a refined intermittent fasting tracker built for calm daily discipline. Start a fast, follow your progress, and understand each stage as your body moves through metabolic phases like digesting, fat burning, ketosis, and autophagy. Vow keeps fasting focused with a precise timer, clear progress, thoughtful reminders, and a minimal dark design made for daily practice. Whether you follow 16:8, 18:6, 20:4, 24-hour fasts, or custom fasting goals, Vow helps you track every session with clarity. FEATURES • Elegant fasting timer with real-time progress • Intermittent fasting plans including 16:8, 18:6, 20:4, and 24h • Metabolic phase tracking from digesting to fat burning, ketosis, and autophagy • Fasting history, streaks, and weekly insights • Custom and extended fasting durations • Goal reminders and phase update notifications • Minimal dark interface with premium themes • Home Screen widgets and Live Activity support Vow Pro Unlock extended fasting protocols, custom durations, premium themes, advanced insights, and premium widgets. Vow is not medical advice. If you have a medical condition, are pregnant, under 18, or have a history of eating disorders, consult a healthcare professional before fasting. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://vowfasting.com/privacy

Screenshots

StayFasted4 screens
Vow Fasting4 screens

Verdict

The call

StayFasted and Vow Fasting 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 Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. StayFasted sells 3 in-app purchases, starting at $5.99 per month and Vow Fasting sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

StayFasted ships an update every 3 weeks, Vow Fasting fortnightly. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

ScorecardNo meaningful differences
StayFasted versus Vow Fasting: the parameters behind the verdict, then further details
ParameterStayFastedVow Fasting
PriceFreeFree
Update frequencyEvery 3 weeksFortnightly — better
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, Apple Watch — betteriPhone
Requires iOS18.017.6 — better
Further details — not scored
Size9 MB13 MB
Age rating4+4+
DeveloperJason DuvalFILIP LUCCA KEJSER DAMICI

In-app purchases

3 purchases

StayFasted

Subscriptions2
  • Pro Monthly$5.991 Month
  • Pro Annual$39.991 Year
One-time1
  • Lifetime Access$49.99
2 purchases

Vow Fasting

Subscriptions2
  • Vow Pro Monthly$4.991 Month
  • Vow Pro Annual$39.991 Year

Questions

Is StayFasted free?
StayFasted is free to download, with in-app purchases available.
Is Vow Fasting free?
Vow Fasting is free to download, with in-app purchases available.
Do StayFasted or Vow Fasting have ads?
Neither StayFasted nor Vow Fasting shows ads.
Which is updated more often, StayFasted or Vow Fasting?
StayFasted ships an update every 3 weeks, and Vow Fasting fortnightly. Most recently, StayFasted was updated on October 28, 2026 and Vow Fasting on October 25, 2026.

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