Comparison

Window vs Fast12

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

Head to head
About

Window

This intermittent fasting timer helps you build healthy eating habits with real-time progress tracking and motivational animations. View your fasting status on the Lock Screen and Dynamic Island without opening the app. Track your history, streaks, and success rate with local data storage and no ads.

Highlights
  • One-tap fasting start
  • Real-time progress tracking
  • Dynamic Island & Live Activities integration
  • Preset and custom fasting durations
  • Fasting history and statistics
  • Local data storage
Features
Read full description

Window is a beautifully designed intermittent fasting timer that helps you build healthy eating habits effortlessly. 【CORE FEATURES】 • One-tap to start fasting with real-time progress tracking • Stunning progress ring animation showing completion percentage • Preset durations: 12/14/16/18/20/24 hours • Custom duration for flexible fasting plans 【DYNAMIC ISLAND & LIVE ACTIVITIES】 • Real-time fasting progress on Lock Screen and Dynamic Island • Check remaining time without opening the app • Beautiful countdown animations to keep you motivated 【HISTORY & STATISTICS】 • Complete fasting history records • Track total fasts, streak days, and average duration • Monitor your success rate and witness your progress 【PRIVACY FIRST】 • All data stored locally on your device • No personal information collected • No ads, no tracking 【ONE-TIME PURCHASE】 • No subscriptions, no hidden fees • Unlock all features with a single purchase • Support indie development Start your fasting journey today. Window is here to help you achieve a healthier lifestyle!

About

Fast12

Build a sustainable fasting routine with a simple timer and personalized coaching. Track your fasting window, hydration, and sleep to understand your body's rhythms. Features AI meal scanning and meal guidance to support your eating window.

Highlights
  • Simple fasting timer
  • Beginner-friendly 12-hour fast
  • Smart fasting insights
  • Personal coaching
  • Hydration tracking
  • AI Meal Photo Scanner
  • Apple Watch support
Features
Read full description

Fast12 helps you build a simple, sustainable fasting routine - starting with the easiest win: a 12-hour overnight fast. Close the kitchen at night, wake up feeling more in control, and build a healthy rhythm without extreme diets, complicated meal rules, or constant calorie maths. Whether you are new to intermittent fasting or want a calmer way to stay consistent, Fast12 gives you the tools to track your fasting window, understand your body, and make better daily choices. WHY FAST12? • Simple fasting timer Start, pause, complete and track your fasting windows with a clear, easy-to-use timer. • Beginner-friendly 12-hour fasting Fast12 is built around a gentle overnight fasting routine, helping you create consistency before chasing longer fasting windows. • Smart fasting insights See how your sleep, hydration, weight, energy and fasting habits connect over time. • Personal coaching Get guidance designed to help you improve your routine, stay consistent, and understand what may be affecting your progress. • Hydration tracking Log water, set daily goals, and spot when thirst may be mistaken for hunger. • Sleep and recovery insights Understand how sleep quality may influence cravings, energy and fasting consistency. • Ai Meal Photo Scanner Snap a quick photo to automatically estimate calories and log your daily meals. • Meal guidance Access fasting-friendly meal ideas and fast-breaking guidance to support your eating window. • Progress and streaks Build momentum with streaks, milestones and progress tracking that help you stay motivated. • Apple Watch support Track your fast from your wrist and keep your routine visible throughout the day. • Widgets, Live Activities and Dynamic Island Follow your fasting progress from your Home Screen, Lock Screen or Dynamic Island. • Privacy-first by design Your health and fasting data stays on your device. No account required. FASTING MADE SIMPLE Fast12 is not about perfection. It is about building one repeatable habit: finish eating, rest, sleep, and start again in the morning. Use Fast12 to: • Track 12:12, 14:10, 16:8 and other fasting schedules • Log meals instantly with AI photo scanning • Reduce late-night snacking • Build a consistent eating rhythm • Monitor hydration, sleep, energy and weight trends • Understand your fasting phases • Stay motivated with streaks and achievements • Get personalised insights based on your routine • Use Apple Watch, widgets and Live Activities for easy tracking BUILT FOR REAL LIFE Many fasting apps focus on advanced fasting windows, strict challenges or complicated routines. Fast12 is designed for people who want a simpler first step. Start with a realistic overnight reset. Build consistency. Then adjust your fasting schedule when you are ready. IMPORTANT HEALTH INFORMATION Fast12 is a wellness and habit-tracking app. It does not provide medical advice, diagnosis or treatment. Intermittent fasting is not suitable for everyone, including some people who are pregnant, breastfeeding, under 18, underweight, have a history of eating disorders, or have certain medical conditions. Speak to a qualified healthcare professional before starting intermittent fasting, changing your diet, or using Fast12 for weight management. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://fast12.d-app.online/privacy.html

Screenshots

Window4 screens
Fast124 screens

Verdict

The call

The clearest difference is monetization model: Window at free against Fast12's freemium. Window also leads on iOS requirement (17.6 vs 26.0). On price, review sentiment, update cadence and ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Window sells 1 one-off in-app purchase and Fast12 sells 2 in-app purchases, starting at $12.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Window ships an update every 9 days, Fast12 every 10 days. Both last shipped on October 13, 2026.

Scorecard2 real differences · 8 level
Window versus Fast12: the parameters behind the verdict, then further details
ParameterWindowFast12
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings1 — better—
Update frequencyEvery 9 days — betterEvery 10 days
AdsNoNo
In-app purchasesYesYes
MonetizationFree — betterFreemium
DevicesiPhone, iPadiPhone, Apple Watch
Requires iOS17.6 — better26.0
Further details — not scored
Size7 MB29 MB
Age rating12+17+
Developer发发 道D App Online Ltd

Customer experience

Window

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Fast12

Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Window

One-time1
  • Window Pro$0.99
2 purchases

Fast12

Subscriptions2
  • Fast12 Premium Monthly$12.991 Month
  • Fast12 Premium Annual7 Days trial$49.991 Year

Questions

Is Window free?
Window is free to download, with in-app purchases available.
Is Fast12 free?
Fast12 is free to download, with in-app purchases available.
Do Window or Fast12 have ads?
Neither Window nor Fast12 shows ads.
Which is updated more often, Window or Fast12?
Window ships an update every 9 days, and Fast12 every 10 days. Most recently, Window was updated on October 13, 2026 and Fast12 on October 13, 2026.

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