Zone 2 Base

An AI coach that plans your week and keeps you in Zone 2, on iPhone and Apple Watch.

Join the free beta (TestFlight)

Free to start. iPhone (iOS 17+) and Apple Watch (watchOS 10+). No account.
Opens Apple's TestFlight. If you don't have it, your iPhone will offer to install it first (free), then tap Accept and Install.

• WebsiteWhat it does, pricing, FAQ
• Zone 2 heart rate calculatorFree: your Zone 2 range in seconds
• Zone 2 apps comparedApple Workout, Garmin, Runna, WHOOP, Polar
• Use your GarminBroadcast heart rate to your iPhone
• SupportHelp and answers
• Email ussupport@zone2base.app
• PrivacyHealth data stays on your iPhone
• TermsTerms of use

© 2026 Zone 2 Base. Not a medical device.