Comparison

Fasting Window vs Sleep Flight

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

Head to head
About

Fasting Window

Features
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Record your own fasting times, without an account. YOUR TIMES IN ONE WINDOW - Read your planned time to eat again, with its date - Correct an active start within the past 24 hours - Choose no goal to record elapsed time without a planned time - Keep your selected 16:8, 18:6, 20:4, OMAD or Custom preset (Custom is saved as 16 hours) - Receive a reminder at your chosen goal, when notifications are allowed - End at any time, including before your chosen goal KEEP YOUR RECORDS - See actual lengths and summaries from your last 90 records - Correct the end time of records that ended within the past 24 hours - Existing local records and settings are preserved SAFETY INFORMATION This is a time record, not a medical tool. It does not measure metabolism or provide medical advice. Goals are personal settings, not recommendations to fast longer. Talk with a healthcare professional before considering fasting, especially if you are under 25, pregnant or breastfeeding, take insulin or diabetes medicines, take medicines that require food, have a seizure disorder, work night shifts or operate heavy machinery. If you have or have had an eating disorder, avoid fasting and consult a healthcare professional. If you feel unwell, stop regardless of your goal and seek professional advice. Sources: NIH News in Health, To Fast or Not to Fast, December 2019; https://newsinhealth.nih.gov/2019/12/fast-or-not-fast Johns Hopkins Medicine, Intermittent Fasting: What is it, and how does it work?, updated April 7, 2026; https://www.hopkinsmedicine.org/health/wellness-and-prevention/intermittent-fasting-what-is-it-and-how-does-it-work

About

Sleep Flight

Features
Read full description

Turn your daily sleep into an anticipated journey. Sleep Flight is not just an alarm—it's a gamified flight system designed to cure bedtime procrastination. We use a fun, immersive flight experience to help you put your phone down, fall asleep on time, and wake up gently. [ Core Flight Experience ] Exclusive Boarding Pass: Set your target sleep time (Takeoff) and wake-up time (Landing). The system generates a unique boarding pass for your flight, making self-discipline feel like a ritual. On-Time Takeoff: When it's time for bed, the flight enters "Cruise Mode". Put your phone down and drift into deep sleep accompanied by pure, relaxing white noise. Gentle Landing: No more sudden jump scares. Sleep Flight wakes you up smoothly with gradually increasing, comforting sounds at your target time. Flight Log: Automatically track your sleep duration and routine. Every consistent night turns into visible "flight mileage". [ Who is this flight for? ] "Phone addicts" who want to sleep early but end up doomscrolling. Students and professionals who need a strong routine for morning productivity. Anyone looking to improve sleep quality with a sense of relaxation and ritual. Ready to fly to sweet dreams tonight? Have a pleasant journey!

Screenshots

Fasting Window4 screens
Sleep Flight4 screens

Verdict

The call

The clearest difference is update cadence: Sleep Flight at every 4 days against Fasting Window's every 2 months. Fasting Window's advantage is iOS requirement (13.0 vs 26.0). On price, ads, in-app purchases and device support 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Fasting Window ships an update every 2 months, Sleep Flight every 4 days. The most recent releases landed on October 24, 2026 and October 19, 2026 respectively.

Scorecard2 real differences · 4 level
Fasting Window versus Sleep Flight: the parameters behind the verdict, then further details
ParameterFasting WindowSleep Flight
PriceFreeFree
Update frequencyEvery 2 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better26.0
Further details — not scored
Size21 MB45 MB
Age rating4+4+
DeveloperHeungYeol KimChengdu Zhixiang Technology Company Limited

In-app purchases

None

Fasting Window

No in-app purchases

None

Sleep Flight

No in-app purchases

Questions

Is Fasting Window free?
Fasting Window is free to download, with no in-app purchases.
Is Sleep Flight free?
Sleep Flight is free to download, with no in-app purchases.
Do Fasting Window or Sleep Flight have ads?
Neither Fasting Window nor Sleep Flight shows ads.
Which is updated more often, Fasting Window or Sleep Flight?
Fasting Window ships an update every 2 months, and Sleep Flight every 4 days. Most recently, Fasting Window was updated on October 24, 2026 and Sleep Flight on October 19, 2026.

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