Fasting Clock vs Fly Robin
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fasting Clock
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Start a fasting timer, close the app, and trust the number when you come back. FastTrkr tracks your intermittent fasting window — 16:8, 14:10, 12:12, 18:6, 20:4 or OMAD — shows elapsed time against your target, then counts down the eating window that follows. Most fasting apps want your email, your weight, your meal photos and a coaching plan. FastTrkr is the opposite: a precise fasting clock with an honest log. The timer is anchored to your iPhone's continuous system clock, so elapsed time stays correct through reboots, timezone changes and clock adjustments. And it records the hours that actually ran — end at 15.2 hours and the log says 15.2, never a rounded-up target. WHAT YOU GET • Open the app 14 hours into a 16:8 and "14:22:07 of 16h" is already on the ring — the clock kept counting while the app was closed • End the fast and an eating-window countdown takes its place, so you know dinner has to land inside the next 7 hours 40 minutes • One local reminder fires the minute your window completes — no fast quietly stretching to 19 hours because you forgot it was running • A day streak, windows-met total and lifetime fast count sit under the ring every time you open the app • Tapped End by accident at hour 3? Edit the start and end times and the session is corrected, with a note field for how it felt • A 14-day bar chart shows your recorded fasting hours at a glance PERFECT FOR • 16:8 beginners who want one number, not a lifestyle program • OMAD and 20:4 practitioners who need a timer that takes long windows seriously • Anyone who quit a fasting app because it demanded an account and a weigh-in first • Shift workers whose windows move — custom hour targets when the standard presets don't fit WHY NOT JUST USE THE CLOCK APP? A plain timer forgets everything when it ends, loses your fast when the phone reboots, and knows nothing about eating windows. FastTrkr survives a reboot mid-fast, logs every session to an editable history, keeps your streak, and tells you when the eating window closes — things a stopwatch will never do. PRIVATE BY DEFAULT No account, no analytics, no ads, no server. Every session is stored on your iPhone and the app works fully offline. Nothing you record ever leaves the device. FastTrkr is a timer, not medical advice. Fasting is not suitable for everyone — read the in-app safety guidance and talk to a clinician if you are unsure. FULL ACCESS FastTrkr Pro unlocks the extended protocols — 18:6, 20:4, OMAD and custom targets up to 23 hours — plus the 14-day hours chart. Choose a weekly or yearly subscription, or a one-time lifetime purchase. Start your first 16:8 tonight — by breakfast the ring will tell you exactly where you stand. Terms of Use: https://leanstudio.asia/terms-of-use Privacy Policy: https://leanstudio.asia/privacy-policy Support: support@leanstudio.asia
Fly Robin
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Fly Robin reads your activity from Apple Health, and a warm little mascot reacts. You step, Robin flies. You sit still, Robin gets sad. — A streak that grows as you move — A warm, friendly mascot — Your data never leaves your device HOW IT WORKS Fly Robin reads your steps, distance, active energy, and exercise minutes from Apple Health — and nothing else. All data stays on your iPhone, never sent to any server. 5 MASCOT MOODS Robin shifts between 5 moods based on your daily progress: • Celebrating — when you crush the goal • Flying — you're doing great • Walking — staying active • Grumpy — falling behind • Sad — streak at risk THE STREAK SYSTEM Hit your daily step goal and your streak grows by 1. Miss a day? You get 3 monthly restores — use one at the last minute to save your chain. GENTLE NUDGES Robin talks to you based on your day: • Morning: "Good morning, let's start" • Afternoon: "We're falling a bit behind" • Evening: "Streak's at risk — a short walk saves it" All notifications are local. Nothing leaves your device. CELEBRATE & SHARE Hit your goal? Confetti rains, Robin cheers, and "Goal hit!" appears on screen. One tap creates a 9:16 share card for Instagram Stories or WhatsApp. ROBIN PLUS — 7 DAYS FREE With Robin Plus, your monthly restores go from 3 to 6. Save your streak more often, build longer chains. Pricing: • Yearly: $19.99/year (~5 months free vs. monthly) • Monthly: $2.99/month • First 7 days free — cancel anytime Local currency set by Apple. PRIVACY FIRST • No personal data collected • Health data stays on device • No third-party analytics • No trackers • All notifications local DEVICE SUPPORT Fly Robin runs on iPhone only. Apple Health required. CONTACT Questions and feedback: flyrobinapp@gmail.com Move with Fly Robin. https://suleturp.github.io/flyrobin.github.io/terms/
Screenshots
Verdict
The clearest difference is in-app purchases: Fasting Clock at none against Fly Robin's 2. Fasting Clock also leads on iOS requirement (17.0 vs 26.0). On price, update cadence, ads 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
Both are free to download. Fly Robin sells 2 in-app purchases, starting at $2.99 per month. Fasting Clock asks for nothing beyond the download.
Fasting Clock ships an update every 4 months, Fly Robin every 2 months. The most recent releases landed on October 11, 2026 and October 16, 2026 respectively.
| Parameter | Fasting Clock | Fly Robin |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone | iPhone |
| Requires iOS | 17.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 3 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | LEAN ASIA CO., LTD | SULE ERDOGAN |
In-app purchases
Fasting Clock
No in-app purchases
Fly Robin
- Robin Plus7 Days trial$2.991 Month
- Robin Plus7 Days trial$19.991 Year









