Support

How can we
help?

Quick answers below. If you're still stuck, email us and a real person will reply, usually within two working days.

Privacy

What stays on your phone, and what doesn't.

Terms

Subscriptions, cancelling and the fine print.

Sensors and devices

My chest strap won't connect

Wet the contacts and put the strap on: most straps sleep until they feel a heartbeat. Then go to Train → Heart rate from → Pair a strap. Zone2 Engine connects only to the strap you've pinned, so other people's straps at the gym won't interfere. If it still doesn't show, make sure it isn't connected to another app or your watch at the same time.

How do I use my Garmin watch?

On the watch, turn on heart rate broadcast (on most Garmin models: hold the menu button → Sensors & Accessories → Wrist Heart Rate → Broadcast Heart Rate, or start it from the controls menu). It then appears in Zone2 Engine like a chest strap. The in-app Devices guide shows the steps.

The Apple Watch app doesn't start the workout

Open Zone2 Engine on the watch once so it can finish setup, and check that Health permissions are allowed for both iPhone and Watch in iOS Settings → Health → Data Access & Devices.

The app closed during a workout

Open it again and tap Recover. Your heart rate readings up to that point are kept.

Zones, plan and ring

My Zone 2 feels too easy or too hard

Go to Settings → Heart rate zones. You can switch method (% of max, heart rate reserve, threshold, MAF 180 or manual) or set your numbers by hand. Pro users also get the personal Zone 2 check, which suggests a new ceiling after long, easy sessions.

Why does my plan wording look simpler than in the screenshots?

The AI-written plan uses Apple Intelligence, which needs a supported iPhone with Apple Intelligence turned on in iOS Settings. On other iPhones, the plan has the same sessions and numbers with simpler wording.

A workout from another app didn't count

Only workouts with heart rate data count. Check the workout in the Health app has heart rate samples, and that Zone2 Engine has read access to Workouts and Heart Rate.

My widget looks out of date

It refreshes when a new workout lands in Health. Make sure Background App Refresh is on for Zone2 Engine in iOS Settings → General → Background App Refresh.

Pro and your data

How do I cancel Pro?

iOS Settings → your name → Subscriptions → Zone2 Engine → Cancel. You keep Pro until the end of the period you paid for.

I bought Pro but it's not unlocked

Open the Pro screen and tap Restore purchases, signed in with the same Apple ID you bought with.

How do I get a refund?

Purchases are handled by Apple, so refunds are requested at reportaproblem.apple.com.

How do I delete my data?

Settings → Delete all app data removes everything Zone2 Engine stores. There's no account and nothing on our servers to delete. Workouts saved to Apple Health stay in Health, where you can delete them yourself.