Comparison

Fastly vs Window

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

Head to head
About

Fastly

This app provides a clean and distraction-free timer for intermittent fasting. It tracks your fasting periods in real-time, offers various popular fasting plans, and automatically monitors fasting phases like fat burning and ketosis. View your history with clear statistics and receive smart reminders.

Highlights
  • Clean fasting timer with real-time tracking
  • Multiple intermittent fasting plans
  • Automatic fasting phase tracking
  • Fasting history with statistics
  • Smart reminders for goals
  • Minimalist interface
  • Dark mode support
Features
Read full description

Fastly is a clean, private fasting timer for 16:8, 18:6, OMAD, and custom schedules—without ads, accounts, or distractions. Start a fast with one tap, adjust your start or end time when needed, and see your elapsed time, remaining time, and planned finish at a glance. Fastly keeps the experience focused while giving you the tools you need to understand your routine and track your progress. FOLLOW YOUR FAST See estimated fasting phases based on your elapsed fasting time, including digestion, fat burning, ketosis, and autophagy. Upcoming phase markers make it easy to see what comes next during your fast. TRACK YOUR PROGRESS Review your complete fasting history through clear statistics, charts, and progress insights. Set weight and body fat goals, and optionally connect Apple Health to keep your measurements organized. STAY ON TRACK EVERYWHERE Follow your fasting status from your iPhone, Apple Watch, Home Screen widgets, and complications. Smart reminders help you stay aware of fasting goals and eating windows without unnecessary interruptions. KEY FEATURES • Real-time fasting timer with elapsed and remaining time • Planned fasting end time displayed at a glance • 14:10, 16:8, 18:6, 20:4, OMAD, and custom plans • Estimated fasting phases for digestion, fat burning, ketosis, and autophagy • Upcoming fasting phase markers • Complete fasting history with statistics and charts • Weight and body fat goals with progress benchmarks • Apple Health integration for weight and body fat • Apple Watch app and complications • Home Screen widgets for quick progress checks • Smart fasting and eating-window reminders • Optional private iCloud synchronization • Dark mode and a clean, focused interface PRIVATE BY DESIGN No ads. No third-party analytics. No developer data collection. Your fasting and health information stays on your devices and, when optional synchronization is enabled, in your private iCloud account. IMPORTANT NOTE Fasting phases are estimates based on elapsed time and can vary from person to person. Fastly is intended for general wellness and fasting tracking only. It does not provide medical advice, diagnosis, or treatment. Consult a qualified healthcare professional before making medical or dietary decisions.

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!

Screenshots

Fastly4 screens
Window4 screens

Verdict

The call

The clearest difference is monetization model: Window at free against Fastly's free with in-app purchases. Window also leads on rating (5.0 vs 4.8). Fastly's advantage is ratings volume (92 vs 1). 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. Fastly sells 4 one-off in-app purchases and Window sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Window holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Fastly has 92 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 94% of Fastly's written reviews are positive against 100% of Window's.

UpkeepUpdate frequency

Fastly ships an update every 10 days, Window every 9 days. The most recent releases landed on October 6, 2026 and October 13, 2026 respectively.

Scorecard3 real differences · 7 level
Fastly versus Window: the parameters behind the verdict, then further details
ParameterFastlyWindow
PriceFreeFree
Rating4.8 (92 ratings)5.0 (1 ratings) — better
Positive reviews94.1% of reviews100.0% of reviews — better
Number of ratings92 — better1
Update frequencyEvery 10 daysEvery 9 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, Apple WatchiPhone, iPad
Requires iOS17.617.6
Further details — not scored
Size9 MB7 MB
Age rating12+12+
DeveloperCollweb LLC发发 道

Customer experience

Fastly

All ratings92 ratings
Positive95.7%
Neutral3.3%
Negative1.1%
Written reviews34 reviews
Positive94.1%
Neutral5.9%
Negative0.0%

Window

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

In-app purchases

4 purchases

Fastly

One-time4
  • Coffee$1.99
  • Lunch$4.99
  • Become a Supporter$4.99
Show 1 more
  • Dinner$9.99
1 purchases

Window

One-time1
  • Window Pro$0.99

Questions

Is Fastly free?
Fastly is free to download, with in-app purchases available.
Is Window free?
Window is free to download, with in-app purchases available.
Which has better reviews, Fastly or Window?
Window is rated higher. Fastly averages 4.8 out of 5 from 92 ratings, while Window averages 5.0 from 1 ratings.
Do Fastly or Window have ads?
Neither Fastly nor Window shows ads.
Which is updated more often, Fastly or Window?
Fastly ships an update every 10 days, and Window every 9 days. Most recently, Fastly was updated on October 6, 2026 and Window on October 13, 2026.

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