Your fasting routine, made simple.
A clear timer and daily windows. Start when you are ready; choose what works for your day.
Free on iPhone and Android
A private fasting routine that fits your life.
Start with a useful free timer. Choose a daily window, log what is useful and look back at your history. No account. No ads. Your routine stays on your device.
Free to start. Optional Premium features are labelled in the app.
- Platform
- iPhone · Android
- Price
- Free
- Account
- Not required
- Your data
- Stays on device
Real app · Sample data
Keep the details that help.
Log water or weight when useful. Your saved history gives you a place to look back.
Preview of our next updateNo account.
No ads.
Your fasting records stay on your device. The useful core works offline, too.
How Fasta protects your privacyPreview of our next update · Fasta 1.0.5
A little more room for you.
These features are being prepared for our next release and are not yet available in the public app.
A Today screen that feels like yours.
Personal cards, weight-free mode and companion preferences will be free. Choose what you see and leave out what you do not need.
A moment to pause.
Free breathing, grounding and reflection sessions will offer one, three or five minutes, with room to pause or stop.
A view of your next week.
Compare two complete weeks of saved activity and explore a weekly schedule for free. Saving and using an editable schedule will require Premium, safety review and confirmation. It will never start a fast automatically.
Most people don't quit fasting because they lack discipline. They quit because the app kept asking for more on the day they had least to give.
Fasta is built the other way round. Some days it tells you to go gentle — and counts that as a good day too.
01The day
A fast, plotted.
Six stages, six colours — the same model the app runs against your live timer. Scroll and watch the hours pass.
0h 00mAnabolic
| Reaches at | Stage | What is happening |
|---|---|---|
| 0h | AnabolicDigesting | Your body is breaking down and storing nutrients from your last meal. Insulin is high; you are not yet burning fat. |
| 4h | CatabolicSwitching fuel | Glycogen stores begin to deplete and your body slowly switches from sugar to fat for fuel. |
| 12h | Fat BurnBurning fat | Insulin is lower and your body may rely more on stored fuel. |
| 18h | KetosisKetones rising | Ketones may begin rising, which some people experience as steadier energy. |
| 24h | AutophagyCellular cleanup | Your body may increase cellular recycling processes during longer fasts. |
| 48h | Deep FastGrowth & repair | Beyond the one-day axis above. Extended fasting is advanced — break gently and avoid pushing without medical guidance. |
8Daily windows
6Fasting stages
0Accounts required
100%Kept on your device
02How it works
Three things, then it gets out of the way.
Pick a window you'll keep
Start at 12:12 or 13:11 if fasting is new — you sleep through most of it. Move up to 16:8 when it stops feeling like a stretch.
Start it and forget it
The ring keeps running on your Lock Screen, in a Live Activity and on your Apple Watch. Water and weight are one tap each.
Let it learn your rhythm
After a handful of fasts, Fasta reads your pattern and starts suggesting the window that fits the day in front of you.
03Inside
Every screen here is the real thing.
Captured from the shipping build, not a designer's mock-up.
Know exactly where you are.
One ring, one number, one next step. The stage name under the timer tells you what your body is actually doing right now — not a vague progress bar.
- 01 Live stage tracking from Anabolic through to Deep Fast
- 02 Streak, next scheduled fast and today's readiness on one screen
- 03 Works with the app closed, on a plane, with no signal
Eight windows. One that fits.
Each plan says plainly what it asks of you and which stage it reaches, so you can choose on evidence rather than on ambition.
- 01 12:12, 13:11, 14:10, 16:8, 18:6, 20:4, OMAD and custom
- 02 Every plan shows the stage it reaches before you commit
- 03 Editable weekly schedules with Premium
The rare app that says: go easier.
Recent fasting load, hydration and how long you've been at it turn into one score out of 100 — and a suggestion sized to the day, which is sometimes shorter than the plan.
- 01 A daily readiness score with the reasons written out
- 02 An adaptive suggestion you can accept in one tap
- 03 A rhythm profile that names the pattern you actually keep
A coach that never leaves your phone.
Ask why today is hard, when to break the fast, or how to refeed well. It answers using your own history, on a compatible iPhone, powered by Apple Intelligence. Android offers local coach-style summaries.
- 01 Runs on-device — questions aren't sent to a Fasta server
- 02 Knows your fasts, energy, hydration and plateaus
- 03 Prompts to start from when you don't know what to ask
A year of consistency, in one grid.
Not a leaderboard, not a feed. Just the honest shape of your last 365 days, and the totals that prove the habit is real.
- 01 365-day grid, lifetime totals and your longest fast
- 02 Trophies, daily check-in and Twin Fast with a partner
- 03 Detailed reports and CSV exports with Premium
04What you get
The whole list, in one table.
See what is included and choose the features that help you.
Apple Health, Apple Watch, Lock Screen widgets and Live Activities require supported Apple devices. Android offers optional Health Connect, a home screen widget and an ongoing fast notification. Check each feature’s access label in your app.
| Capability | Free | Premium |
|---|---|---|
| Tracking | ||
| Fasting timer with live stage tracking | ||
| Daily presets: 13:11 to 20:4, plus custom | ||
| Water and weight logging | ||
| Optional Apple Health / Health Connect sync | ||
| Streaks, basic progress and history | ||
| Basic weekly recap | ||
| Guidance | ||
| Daily readiness score and adaptive suggestion | ||
| Private on-device coach | ||
| Editable weekly schedules | ||
| Detailed reports | ||
| Your data | ||
| Works with no account and no signal | ||
| CSV export | ||
| Time Capsule, Year in Review and reflections | ||
Apple Watch, iPhone widgets and Live Activities require supported Apple devices. Android includes a home screen widget and optional Health Connect integration. Check availability on your device.
05The difference
Consistency, not escalation.
The usual fasting app
Category norm- An account before you've tracked a single hour
- Longer is always better, and the streak is the point
- A social feed you did not ask to be in
- Your health history on somebody else's server
Fasta
This app- Open it and start — there is no sign-up screen
- A readiness score that will tell you to go shorter
- No feed, no comparison, no audience
- Your history stays on the device you're holding
06Privacy
Health data you never handed over.
Fasting is intimate data — when you eat, what you weigh, how you felt about it. The safest place for that is the phone in your pocket, so that's the only place Fasta keeps it.
No account server
There is no Fasta account, and no Fasta server that receives your fasts, weight, water, measurements, mood or reflections.
No advertising trackers
No ads and no third-party advertising analytics in the app. This website loads no third-party scripts or fonts either.
Kept only while you keep it
Data lives in the app's private sandbox for as long as the app is installed. Delete individual records, wipe everything with Delete local data, or just uninstall — there is no server copy to chase. The full privacy policy sets out retention and deletion in detail.
07Pricing
A useful free routine. More when you need it.
Fasta
Free
No account, no card, no trial clock.
- Fasting timer with live stage tracking
- Daily presets from 13:11 to 20:4, plus custom
- Water and optional weight logging; supported health sync
- Basic weekly recap, progress and history
- Time Capsule, Year in Review and reflections
Fasta Premium
OptionalSee the current offer
Price, period, any trial and renewal terms are shown in your app store before you buy, and vary by country.
- Private on-device coach
- Editable weekly schedules
- Detailed reports and CSV export
- Additional themes and timer styles
Fasta is free to download. Premium is an auto-renewing subscription managed through your Apple or Google account and can be cancelled there at any time. Rated 17+ on the App Store. Fasta is not medical advice — if you are pregnant, under 18, managing a medical condition, taking medication affected by food timing, or have a history of disordered eating, speak with a qualified health professional before fasting.
08Questions
The things people actually ask.
Do I need an account to use Fasta?
No. There is no sign-up and no login. Your fasts, weight, water, measurements, mood, readiness history and reflections live on your device, and there is no Fasta account server that receives them.
How much does Fasta cost?
Fasta is free to download and the core tracker is free to use. Premium is an optional subscription managed through your app store — price, period, any available trial and renewal terms are shown in your app store before you purchase, and they vary by country.
Is Fasta available on Android?
Yes. Get Fasta on Google Play for Android 8.0 or later. Apple Watch and Apple Intelligence features require supported Apple devices.
Does the coach send my data to a server?
No. Coach context is processed on your device. Apple Intelligence responses require a compatible iPhone; Android provides local coach-style summaries. Your questions and fasting history are not sent to a Fasta server.
Which fasting windows does Fasta support?
13:11, 14:10, 16:8, 18:6 and 20:4, plus custom daily windows. One-week schedule starters are free; Premium adds editable weekly schedules.
Does Fasta work on Apple Watch?
Yes. Fasta includes an Apple Watch app, Lock Screen and Home Screen widgets, and Live Activities, so a running fast is visible without opening the app. Fasta requires iOS 15.1 or later.
Can I get my data out — or delete it?
Both. Premium includes CSV export of your fasting history. For deletion, remove individual records in the app, use Delete local data to wipe your local profile, logs, history, check-ins, recaps and schedules, or uninstall Fasta to remove its app-private data entirely. There is no Fasta account server holding a copy. See the privacy policy for the full retention and deletion terms.
Is intermittent fasting safe for everyone?
No, and Fasta is not medical advice. If you are pregnant, under 18, managing a medical condition, taking medication affected by food timing, or have a history of disordered eating, speak with a qualified health professional before fasting. Read the terms for the full position.
Start where you actually are.
Twelve hours counts. So does the day you decide to go shorter. Fasta is free on the App Store and Google Play. No account required; Premium is optional.
Choose your store. No account required.
Not faster. Fasta.
iOS 15.1+ · Android 8.0+ · English · For adults 18+