BaseMile
A free, open source heart rate running coach that runs entirely on the phone.
- Type
- Studio product
- Role
- Design, development and open source release
- Year
- 2026
- Platform
- Mobile app
- Run types
- 3
- Trends tracked over time
- 4
- Accounts, servers or sync
- 0
Overview
BaseMile is a running coach for the cardio days of the Foundational Fitness week from Andrew Huberman's book Protocols. It pairs with a Bluetooth chest strap, speaks cues with the phone's own voice and turns each run into clear trends. It is an independent project, not affiliated with or endorsed by Andrew Huberman or Huberman Lab.
Challenge
Most fitness apps want an account, a subscription and the cloud. A heart rate coach also has to keep talking with the phone in a pocket, the screen off and no signal.
Approach
We built three run types: Long runs in Zone 2 under a MAF ceiling, Medium runs at 75 to 85% of max heart rate, and Brief runs as 30/60 repeats or a 4x4. Everything runs on the phone, with no account, no server, no sync and no AI.
Outcome
Released as open source on 18 October 2026 under the GPL-3.0, with a signed Android APK on GitHub. It is tested on Android, and iPhone builds can be made from the source.
Key features
Three run types
Long runs in Zone 2 under a MAF ceiling, Medium runs at 75 to 85% of max, and Brief runs as 30/60 repeats or a 4x4.
Live heart rate from a chest strap
Pairs with any standard Bluetooth heart rate strap. The Garmin HRM-Dual is the tested one.
Spoken cues that work offline
Cues use the phone's own voice, so the coach keeps talking with no signal and, on Android, with the screen off.
Voice Mode
A hands free screen that holds a strict heart rate band and tells you when you drift out of it.
Trends, routes and tests
MAF pace, decoupling, training load and weekly Zone 2 minutes, a heat map of your routes, and tests such as resting and max heart rate.
Your runs stay on the phone
No account, server or sync. The only network use is weather, elevation and map tiles, and weather and elevation can be switched off.
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