Live Activity iPhone
On your Lock Screen, without unlocking.
Elapsed time, your goal, and the current stage, right on your Lock Screen. It follows you into the Dynamic Island while you use other apps, and you can end the fast from there.
A fasting timer. That’s it.
Start a fast, watch the ring fill, and fix the times when life gets in the way. No account, no ads, and no subscription required.
Free on iPhone and Android. Apple Watch and Wear OS with Pro.
The timer
Pick a plan.
Press start.
Every popular schedule is one tap away, or set any length you like. One ring shows how far you’ve come. Tap it to see time elapsed, time left, or percent done.
16:816 hours
18:618 hours
20:420 hours
OMAD23 hours
5:224 hours
CustomAny length
Started before you opened the app?
Move the start time back, even in the middle of a fast. The ring catches up instantly.
Ending early, or late?
Change the end time as you stop, early or late. Your history records what actually happened.
Reminders, not nagging.
Optional nudges when you start, at halfway, and when you reach your goal. Nothing else.
Your history
Forgot the timer?
Fix it in two taps.
Life doesn’t run on a timer. Nistis lets you put your history right, and keeps your streak honest while you do.
- Change any start or end time, on any day
- Log a fast you never tracked: tap the day, add it
- Keep a note and a mood with every fast
- Your streak recalculates itself after every edit
Free and unlimited. Always.
Fasting stages
See where you are.
A simple timeline of the stages commonly associated with fasting, counted from your last meal. Nistis shows you where you are, and makes no promises about your body.
Digesting
0–4hYour last meal is still being digested.
Post-absorptive
4–8hThe meal is absorbed and your body turns to its reserves.
Glycogen depletion
8–12hStored sugar runs down.
Fat burning
12–16hMore of your energy comes from fat.
Ketosis ramp
16–24hKetones rise as fat becomes the main fuel.
Deep ketosis
24h+Ketosis continues as the fast goes on.
General information, not medical advice. Individual responses vary.
Nistis Pro
Your fast, everywhere you look.
Lock Screen, Home Screen, and your wrist. Pro puts your fast wherever you’ll see it — for one payment, yours for good.
Apple Watch & Wear OS iPhone & Android
Start and end from your wrist.
A full watch app that puts your fast on the watch face. On Android, a Wear OS app with a tile too.
Widgets iPhone & Android
A glance is all it takes.
Home Screen and Lock Screen widgets in every size, with your ring, goal time, and streak. One widget is free; Pro unlocks them all.
Apple Health iPhone
Weight and water, kept in step with the Health app.
iCloud sync iPhone
Your history on every Apple device, through your own private iCloud.
Trends iPhone & Android
Monthly and yearly trends, completion rate, and average fast length.
Import & export iPhone & Android
Bring your history from Zero or a spreadsheet, and take it with you any time.
On Android, your history is also part of your phone’s Google backup, so it comes back on a new phone.
Pricing
Free. Or pay once.
The timer is free and always will be. If you want more, unlock Pro with a single payment.
Nistis
Free
The complete timer. No trial, no catch.
- 16:8, 18:6, 20:4, OMAD, 5:2, and custom fasts
- Unlimited history, with editing and backfill
- The fasting stages timeline
- Streaks and weekly stats
- Start, halfway, and goal reminders
- A Home Screen widget
- Light and dark mode
Nistis Pro
$29.99once
Every feature, on every screen. Yours to keep.
- Everything in Free, plus:
- Apple Watch and Wear OS apps, with your fast on the watch face
- Live Activity and Dynamic Island
- Every widget style, including the Lock Screen
- iCloud sync across your Apple devices
- Apple Health sync for weight and water
- Trends and advanced stats
- Import from other apps, export to a spreadsheet or a backup file
- Extra accent colors
Prefer smaller payments? Pro is also $2.99 a month or $14.99 a year, with a 7‑day free trial. Upgrade inside the app, whenever you like.
Free stays free.
Whatever ships free stays free. We put that in writing, and we mean forever.
Less than a year of the usual subscription.
Most fasting apps bill you every year. Pro is one payment, and then it’s yours.
Prices in US dollars. The App Store and Google Play set prices in other countries, so yours may differ.
The fine print
No account. No ads.
Nothing collected.
Open it and start. Your fasts stay on your phone: there’s no Nistis account and no Nistis server. On iPhone, sync runs through your own private iCloud. On Android, your history is part of your phone’s own Google backup.
No account, no ads.
Nothing to sign up for, nothing sponsored, and no notifications trying to win you back.
We collect nothing.
No analytics, no tracking, nothing sold. Check Nistis’s privacy details on the App Store or Google Play, or read the policy. It’s short.
Works offline.
Everything lives on your device. Nistis never needs a connection to time a fast or keep your history.
Nistis is built and supported by one person, who reads every email. Say hello.
Questions
Good questions.
Do I need to create an account?
No. There’s nothing to sign up for and nothing to sign in to. Open the app and start your first fast.
Can I bring my history from another app?
Yes. Import from Zero’s export or any spreadsheet. Your first import is free, so you can move in before you decide on Pro.
Does it work without a connection?
Completely. Timing a fast, editing your history, and seeing your stats all work offline, every time.
Is this medical advice?
No. Nistis is a timer, not a medical device. Talk to your doctor before you start fasting, especially if you have a medical condition, are pregnant, or take medication.
Start your next fast
in under a minute.
Download Nistis, pick a plan, press start. No sign-up in between.