Fasting protocols
16:8, 18:6, 20:4, OMAD and custom windows — which suits your week.
Fasting, Southeast Asian waySee what's inside
Fast In Real Time.
An intermittent fasting tracker that actually understands how Southeast Asia eats, prays and fasts — with a built-in AI coach, real food data, and a Ramadan mode that's free forever.
App Store · Releasing to everyoneSeptember 2026
Google Play · Releasing to everyoneSeptember 2026
Free to start · No account needed to try · Ramadan Mode free forever
Fasting Timer
Most fasting apps are built for someone else's diet.
Most give you a timer and nothing else.
FastLah gives you the timer, the science, the food, and a coach.
The timer
Fast In Real Time
- A live fasting ring that intensifies as you go, with fire levels and a glowing animated core.
- Full fasting-phase timeline so you know exactly when you enter fat-burning, ketosis and autophagy.
- Milestone alerts the moment you hit them.
- Edit or backfill any fast — life happens.
Fasting Timer
The whole picture
Every Win Tracked
- Weight trend, water intake, and a mood and energy journal in one dashboard.
- Resting heart rate synced from Apple Health.
- Calendar heatmap of every fast you've logged.
- Advanced correlation insights and a fully customisable dashboard.
Progress Dashboard
The coach
Your AI Coach
- Ask real fasting questions in plain language and get grounded, personalised answers.
- Knows your fasting history and your goals.
- Available every day, whenever the question comes up.
- Stays strictly on fasting, nutrition and wellbeing.
AI Coach
The food
Eat With Real Data
- Break-fast food logging built into the timer flow.
- Full meal and macro tracker.
- Barcode scanning for packaged foods.
- Search a global food database covering local and international products.
Food Log
The habit
Stay In It
- Streaks with streak freezes for the days life happens.
- Achievement badges as you go.
- Challenges with a global leaderboard.
- Motivation, hydration and milestone reminders that arrive when they help.
Challenges
Ramadan Mode
Ramadan Ready
- Accurate prayer times for your country.
- Suhoor and Iftar timings, set to your location.
- A Ramadan calendar for the whole month.
- Ramadan-specific challenges and learning content.
- A members' community feed for the month.
Free every Ramadan. Every year. No subscription.
Ramadan Mode is opt-in — FastLah stays a normal fasting app until you turn it on.
Ramadan Mode
Learn library
Master The Fast
An in-app library that explains the why behind every hour of your fast.
What happens hour by hour
From glucose to fat-burning to autophagy, explained plainly.
Hydration
How much water, when, and what counts during a fast.
Breaking a fast safely
What to eat first, and why the first meal matters.
Fasting and training
Timing workouts around a fasting window.
Ramadan guidance
Suhoor, Iftar and staying steady through the month.
Learn Library
Community & safety
A community that stays kind.
Moderation isn't fine print here — it's built into the feed.
Every post can be reported or hidden.
Any member can be blocked instantly.
Community guidelines are enforced.
Heavily-reported posts are withheld automatically.
Pricing
Start free. Go Ultimate when ready.
Free
Everything you need to start.
US$0
- Core fasting timer & phases
- Water, weight & mood logging
- Break-fast food logging
- 1 active challenge
- Ramadan Mode, always
App Store · Releasing to everyoneSeptember 2026
Google Play · Releasing to everyoneSeptember 2026
Most popular
FastLah Ultimate
The full picture, plus your coach.
US$39.99/ year
Save 16% · Best value — works out to about US$3.33 a month
Everything in Free, plus:
- AI Coach for daily fasting questions
- Full meal & macro tracker
- Unlimited fasting history
- Advanced correlation insights
- Customisable dashboard
- Unlimited challenges + global leaderboard
- CSV / PDF export for your doctor
App Store · Releasing to everyoneSeptember 2026
Google Play · Releasing to everyoneSeptember 2026
| Feature | Free | Ultimate |
|---|---|---|
| Core fasting timer & phases | Included | Included |
| Water, weight & mood logging | Included | Included |
| Break-fast food logging | Included | Included |
| 1 active challenge | Included | Included |
| Ramadan Mode, always | Included | Included |
| AI Coach for daily fasting questions | Not included | Included |
| Full meal & macro tracker | Not included | Included |
| Unlimited fasting history | Not included | Included |
| Advanced correlation insights | Not included | Included |
| Customisable dashboard | Not included | Included |
| Unlimited challenges + global leaderboard | Not included | Included |
| CSV / PDF export for your doctor | Not included | Included |
Prices shown in USD. You'll see your local price in the App Store. Subscription renews automatically unless cancelled at least 24 hours before the period ends. Manage or cancel anytime in your Apple account settings.
Loved in SEA
What fasters say
Fasting & Ramadan · 2026
“Way better — and cheaper — than Zero.”
“Finally an app that knows what sahur is.”
“The AI coach actually answers like a human.”
“Logged nasi lemak without fighting the search bar.”
“Ramadan Mode alone is worth the download.”
“Cleanest fasting timer I've used on iPhone.”
“Switched from three apps to just this one.”
“My streak is at 41 days. Never happened before.”
“Way better — and cheaper — than Zero.”
“Finally an app that knows what sahur is.”
“The AI coach actually answers like a human.”
“Logged nasi lemak without fighting the search bar.”
“Ramadan Mode alone is worth the download.”
“Cleanest fasting timer I've used on iPhone.”
“Switched from three apps to just this one.”
“My streak is at 41 days. Never happened before.”
FAQ
Good questions, honest answers.
Official addresses
This is the official FastLah site
FastLah is reachable on several domains, and every one of them serves this same official website. Whichever you land on, you're in the right place — anything outside this list is not run by us.
- fastlah.appPrimary home of FastLah
- fastlah.comGlobal address
- fastlah.asiaSoutheast Asia
- fastlah.sgSingapore
- fastlah.idIndonesia
fastlah.app is our canonical address, so search engines index the site once even though all five domains work.
FastLah is a wellness and habit-tracking app, not a medical device, and does not provide medical advice, diagnosis or treatment. Talk to a qualified healthcare professional before starting any fasting programme, especially if you are pregnant or breastfeeding, under 18, diabetic, taking medication, or have a history of eating disorders.
Your next fast starts now.
App Store · Releasing to everyoneSeptember 2026
Google Play · Releasing to everyoneSeptember 2026
iPhone, iPad and Android · Releasing to everyone in September 2026