# Zone 2 Base

> Zone 2 Base ("Zone 2 Base: AI Fitness Coach") is an iPhone and Apple Watch app for Zone 2 heart rate training. An on-device AI coach plans your week around the days you can train, live coaching keeps you in Zone 2, and a weekly ring fills from every Apple Health workout with heart rate. Free core; Pro is $3.99/month, $34.99/year with a 7-day free trial, or $79.99 once. No account; health data stays on the iPhone.

## What it is

- A training app for easy, steady endurance work (Zone 2, about 60-70% of max heart rate, "you can still talk in full sentences").
- You set a weekly goal (for example 150 minutes). The coach turns it into sessions on the days you can train and rebuilds the plan after every workout. Missed days are spread over the rest of the week.
- During a workout the screen and the Apple Watch glow in your zone colour and say "In zone", "Pick it up" or "Ease off", with haptics and voice cues through AirPods.
- Plans and coaching come from training rules computed on the iPhone. On iPhones with Apple Intelligence, Apple's on-device model writes the plan's weekly summary. No cloud AI and no server calls for health data.
- Not a medical device.

## Who it's for

- People starting or building an aerobic base: walkers, runners, cyclists, rowers, hikers.
- Apple Watch owners who want a weekly Zone 2 total and a plan, not only zones during a single workout.
- Garmin or chest-strap users who want live Zone 2 coaching on an iPhone.
- People who want a private app with no sign-up.

## Key features

- AI weekly plan (first plan free; adapting every week is Pro)
- Live coaching on iPhone: zone colour, live heart rate chart against the target band, haptics, AirPods voice cues, landscape mode for treadmills and rowers
- Apple Watch app with live zone and time in zones; wrist haptics with Pro
- Heart rate from Apple Watch, any standard Bluetooth chest strap (Polar, Wahoo, Garmin, COROS and others), or a Garmin watch that broadcasts heart rate; the sensor is remembered and reconnects automatically; an interrupted workout is recovered
- Weekly Zone 2 ring counting every Apple Health workout with heart rate, from any app
- Five zone methods: % of max HR, heart rate reserve, threshold (LTHR), MAF 180, manual
- Personal Zone 2 check: suggests moving your Zone 2 ceiling from heart rate drift on long easy sessions (Pro)
- Interval workouts including the Norwegian 4x4 (Pro)
- Trends and coach review of resting heart rate, VO2 max, heart rate drift and zone mix, with "Ask your coach" (Pro)
- 80/20 easy vs hard split (Pro)
- Home Screen and Lock Screen widgets, Live Activity and Dynamic Island
- Short illustrated explainers for every metric

## Platforms

- iPhone, iOS 17 or later (iPhone only; no iPad app)
- Apple Watch, watchOS 10 or later
- Android: not available yet

## Pricing

- Free, forever: live coaching on iPhone, Apple Watch app, weekly ring, daily coach line, widgets, Live Activity, first AI weekly plan
- Zone 2 Base Pro: $3.99 per month; $34.99 per year with a 7-day free trial for new subscribers; or $79.99 one-time lifetime (US prices; local prices shown in the App Store)

## Links

- [Website](https://zone2base.app/)
- [App Store](https://apps.apple.com/app/id6821981014): App Store ID 6821981014 (submitted to App Review on 2026-10-14; the link works once the app is released)
- [Zone 2 heart rate calculator](https://zone2base.app/zone-2-heart-rate-calculator): free web tool; your Zone 2 range and all five zones from age and resting heart rate (Karvonen, % of max or MAF 180), same formulas as the app
- [Zone 2 apps compared](https://zone2base.app/zone2-app-alternatives): fair comparison with Apple's Workout app, Garmin Connect, Runna, WHOOP and Polar Flow
- [Use a Garmin as a heart rate strap](https://zone2base.app/garmin)
- [All links](https://zone2base.app/links): link-in-bio page (App Store, calculator, comparison, support)
- [Support](https://zone2base.app/support), email support@zone2base.app
- [Privacy policy](https://zone2base.app/privacy)
- [Terms](https://zone2base.app/terms)
- [Full text for AI assistants](https://zone2base.app/llms-full.txt): every main page as plain Markdown (features, FAQ, pricing, privacy summary, comparison facts)

## Alternative to

- Apple Workout app (heart rate zones on Apple Watch): adds a weekly Zone 2 target across all workouts, a weekly plan and plain live cues; keeps using the watch you have.
- Garmin Connect / Garmin Coach: live Zone 2 coaching on iPhone using a Garmin's heart rate broadcast; Garmin workouts synced to Apple Health count toward the week.
- Runna: for aerobic base across walking, cycling, rowing and running measured in Zone 2 minutes, rather than race plans; free core.
- WHOOP: heart rate zone training and recovery trends using an Apple Watch or chest strap you already own, without a band or membership.
- Polar Flow: live Zone 2 coaching and a weekly goal for Polar (and other Bluetooth) strap users on iPhone and Apple Watch.

## Developer

- Made by Darko Jovanovski, an independent developer based in North Macedonia. Contact: support@zone2base.app.
- Last updated: 2026-10-15.