Fastly vs Fasting Clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fastly
This app helps you track intermittent fasting with a clean interface, customizable plans, and motivational features. Monitor your body's response through different fasting zones and visualize progress with charts and widgets. Your data remains private, stored locally or optionally via iCloud.
- Customizable fasting plans (16:8, OMAD, etc.)
- Real-time circular timer and zone tracking
- Motivational streaks, badges, and calendar heatmap
- Weight tracking with trend visualization
- Home screen widgets and Live Activities
- Optional iCloud sync and CSV export
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Intermittent fasting, without the clutter. Fastly is a clean, private fasting timer built for people who want to stick to 16:8, OMAD, or any plan they choose — with beautiful widgets, real-time zone tracking, and zero ads or accounts. Start a fast in one tap. Watch your body move through five fasting zones — from catabolism to deep autophagy. Build streaks, earn badges, and see your progress in charts that actually make sense. FASTING, YOUR WAY • Pick from 16:8, 18:6, 20:4, OMAD, 5:2, or build a custom plan • Live circular timer with elapsed, remaining, and target • Edit past fasts or log a forgotten one manually • End a fast by voice with the Siri shortcut SEE YOUR BODY'S RESPONSE • Five fasting zones: Anabolic, Catabolic, Fat Burning, Ketosis, Autophagy • Clear guide explains what's happening at each stage • Gentle notifications when you enter a new zone STAY MOTIVATED • Streaks and weekly summaries • 20 unlockable badges for consistency and milestones • Calendar heatmap shows every fast at a glance • Full history with notes on each session TRACK YOUR WEIGHT • Log in kg or lbs in one tap • Visualize trends over weeks, months, or years • Combined timeline of fasts and weight changes WIDGETS + LIVE ACTIVITIES • Home Screen widgets in Small, Medium, and Lock Screen sizes • Live Activity keeps your fast visible on the Lock Screen and Dynamic Island • Real-time countdown and zone status — no need to open the app YOUR DATA STAYS YOURS • Optional iCloud sync across iPhone and iPad • No account, no ads, no tracking • CSV export anytime (Pro) FASTLY PRO Unlock the full experience: • Unlimited history (free tier shows last 30 days) • Widgets • Trend, Eating Window, Fasting Pattern, and Weight charts • 30-day and yearly insights • CSV export of all your data PRIVACY FIRST Your data lives on your device (and optionally your private iCloud). We don't collect, sell, or share anything. Ever. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://23apps.org/privacy/fastly
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
Screenshots
Verdict
The clearest difference is in-app purchases: Fasting Clock at none against Fastly's 1. Fastly's advantage is device support (3 vs 1). On price, update cadence, ads and iOS requirement 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. Fastly sells 1 in-app purchase, starting at $2.99 per year. Fasting Clock asks for nothing beyond the download.
Fastly ships an update every 3 months, Fasting Clock every 4 months. The most recent releases landed on October 24, 2026 and October 11, 2026 respectively.
| Parameter | Fastly | Fasting Clock |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 months — better | Every 4 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | — |
| Devices | iPhone, iPad, Apple Watch — better | iPhone |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 6 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Tejas Patel | LEAN ASIA CO., LTD |
In-app purchases
Fastly
- Fastly Pro$2.991 Year
Fasting Clock
No in-app purchases









