Know your window
See whether you're fasting or eating and how much time remains. No mental countdown.
FastTempo for iPhone + Apple Watch
Track your fasting
on Apple Watch.
A quick look at your wrist. Your current window, time remaining, and a way to switch between eating and fasting when your day changes.
Watch controls require Premium.
iOS 26+ · watchOS 26+ · Paired iPhone required for setup.
Real app captures. Device frames are illustrative.
Change it from your wrist
With Premium, scroll below the timer and tap the Eat/Fast control when you start or finish eating.
Keep status on your watch face
Add a FastTempo complication to a compatible face for a glance at your current status.
Your routine, with fewer checks
Set up on iPhone.
Check in on your Watch.
Your iPhone is the place to choose your schedule and review your history. Your Watch keeps the current window in view.
Read the Apple Watch setup guideChoose your eating window
Download FastTempo on your iPhone, complete onboarding, and review the subscription options.
Open FastTempo on your Watch
Install the Watch app using the paired iPhone's Watch app if needed. Open FastTempo on both devices and check your current state.
Check the timer. Tap when you change windows.
With Premium, tap Eat when you start eating and Fast when you finish. The control is below the timer. If your timer is paused, manage pause settings on your iPhone.
Before you download
A few useful details
What do I need to use FastTempo on Apple Watch?
A paired iPhone running iOS 26 or later and an Apple Watch running watchOS 26 or later. Use the iPhone for onboarding, schedule settings, and subscription setup.
Do Watch controls require Premium?
Yes. Switching between eating and fasting on Apple Watch requires FastTempo Premium subscription access. Review current prices, trial eligibility, renewal terms, and any commitment on the purchase screen in the iPhone app before subscribing.
Does Apple Watch automatically detect a fast?
No. FastTempo tracks the windows you set and the changes you make. When you start or finish eating, use the Eat/Fast control. With Premium, you can also enable automatic schedule-based start and stop on your iPhone.
Can I use it without my iPhone?
Set up FastTempo on your paired iPhone first. Watch and iPhone updates depend on their connection. After a disconnection, open both apps and confirm that their eating or fasting state agrees.
Can I put the timer on my watch face?
Yes. Add a FastTempo complication to a compatible watch face to see your status. Available complication styles depend on the face and position. The setup guide walks you through the options.
Need installation steps or help with syncing? Read the full guide or contact FastTempo support.
Keep your window in view
Your next check can be a glance.
Get FastTempo for your iPhone and Apple Watch.
Watch controls require Premium. Review subscription terms in the app.