Comparison

Auto Sleep Detector & Tracker vs FastOnce

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

Head to head
About

Auto Sleep Detector & Tracker

Automatically track sleep duration and patterns using your phone's sensors. Get personalized insights and recommendations to improve your rest without wearables or subscriptions. All your data stays securely on your device.

Highlights
  • AI-powered sleep tracking
  • No wearables required
  • Privacy-first design
  • Detailed sleep analytics
  • Apple Health integration
  • Personalized sleep insights
Features
Read full description

Understand when you may have slept—even if you forgot to start a timer. Sleep Detector notices how long the app has been away. When you return after a long interval, it creates an editable sleep estimate for review. App-away time alone is not treated as proof of sleep: low-confidence estimates always wait for your confirmation. For more context, optionally connect Apple Health and the Apple Watch companion. Sleep stages and selected recovery signals can refine a candidate; only periods you confirm are written back to Health when sync is enabled. REVIEW BEFORE SAVING • Inspect estimated start and end times • See confidence and evidence details • Edit, confirm, or dismiss each estimate • Review history, trends, and daily wellness context APPLE WATCH + HEALTH • View last night's duration and stages on your wrist • Refresh on demand—no continuous sensor workout • Read Health data only after permission • Write only confirmed sleep periods • Avoid duplicate Health entries PRIVATE BY DESIGN • No account • No advertising or tracking • No cloud sleep profile • On-device storage and analysis • User-initiated JSON and CSV export BATTERY CONSCIOUS Sleep Detector records lightweight app lifecycle timestamps instead of running a continuous background sensor session. iOS may suspend apps; the estimate is completed when Sleep Detector is reopened. Sleep Detector supports awareness and journaling. It is not a medical device and does not diagnose sleep disorders. Results depend on available evidence and user confirmation.

About

FastOnce

Features
Read full description

One giant button. That is the whole app. Tap it to start a fast, tap it to end. A real 24-hour clock face shows exactly where your fast sits in the day, not an abstract bar. Available in English, Spanish, French, Arabic, Russian, Hindi and Ukrainian. RAMADAN Switch on Ramadan mode and the timer stops being a number of hours you picked. Your fast runs from suhoor to iftar, worked out on the phone for wherever you are, and both times move a few minutes every day exactly as they really do. Six calculation methods: Umm al-Qura, Dubai, the Egyptian General Authority, the Muslim World League, Karachi and North America. The one used where you are is chosen for you. Everything is computed on the device from your location, so it works with no signal at all and nothing is sent anywhere. Ramadan mode appears in the app as the month comes round. WHY FASTONCE Nearly every fasting app rents you a timer. You answer a quiz, hand over an email, then pay monthly for a clock. FastOnce asks for none of that. No account, no sign-up, and it opens straight onto the button. WHAT YOU GET, FREE A dial that actually reads as time The ring wraps a 24-hour wall clock, so you can see at a glance that your fast ends at 8pm rather than decoding a percentage. Plans that fit your day 12:12, 14:10, 16:8, 18:6, 20:4 and OMAD, or set your own hours. You can also pick the time you want to finish and the length is worked out for you. It keeps going by itself When your fast ends the eating window opens, and when that closes the next fast begins. Weeks can pass without opening the app. Forgot to hit start Backdate the start time and the ring, the stages and every reminder recalculate instantly. Stages, explained in plain language Blood sugar drop, fat burning, ketosis and autophagy, each with a short friendly explanation. No clinical claims, no scare tactics. Your calendar, your streaks, your totals A month calendar of completed fasts, current and longest streaks, and your totals. Free, and staying free. Gentle nudges, only if you want them Optional pings at the halfway mark, at each stage, when your fast completes, and short encouragement while you are in it. Quiet overnight. A home-screen widget Your current fast at a glance without opening anything. FASTONCE PRO, ONE PAYMENT Pro is a single purchase. No subscription, nothing renews. It adds three things and nothing else: Charts and trends Hours per day, how often you reach your goal, your weekly average, and the hour you actually start. Export your log Every fast you have finished, as a spreadsheet file that leaves the app and is yours to keep. Still no account, still offline Pro changes what you can see, not where it lives. PRIVACY No account, no analytics, no advertising, no server of ours. Nothing you record ever leaves your iPhone, and neither does your location. The only time FastOnce talks to anything is when you buy Pro, which goes through the App Store. FastOnce shares general wellbeing information, not medical advice. Talk to a doctor before changing your eating habits.

Screenshots

Auto Sleep Detector & Tracker4 screens
FastOnce4 screens

Verdict

The call

The clearest difference is update cadence: FastOnce at every 6 days against Auto Sleep Detector & Tracker's monthly. Auto Sleep Detector & Tracker's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 17.0). On price, ads and in-app purchases 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

Auto Sleep Detector & Tracker ships an update monthly, FastOnce every 6 days. Both last shipped on September 9, 2026.

Scorecard3 real differences · 7 level
Auto Sleep Detector & Tracker versus FastOnce: the parameters behind the verdict, then further details
ParameterAuto Sleep Detector & TrackerFastOnce
PriceFreeFree
Rating1.0 (1 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings1 — better—
Update frequencyMonthlyEvery 6 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPod, Apple Watch — betteriPhone
Requires iOS15.1 — better17.0
Further details — not scored
Size40 MB6 MB
Age rating4+4+
DeveloperSimpliXio Pte. Ltd.Andrii Zakharov

In-app purchases

None

Auto Sleep Detector & Tracker

No in-app purchases

None

FastOnce

No in-app purchases

Questions

Is Auto Sleep Detector & Tracker free?
Auto Sleep Detector & Tracker is free to download, with no in-app purchases.
Is FastOnce free?
FastOnce is free to download, with no in-app purchases.
Do Auto Sleep Detector & Tracker or FastOnce have ads?
Neither Auto Sleep Detector & Tracker nor FastOnce shows ads.
Which is updated more often, Auto Sleep Detector & Tracker or FastOnce?
Auto Sleep Detector & Tracker ships an update monthly, and FastOnce every 6 days. Most recently, Auto Sleep Detector & Tracker was updated on September 9, 2026 and FastOnce on September 9, 2026.

Other comparisons