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Serpin works with standard Bluetooth (BLE) training sensors — heart-rate straps, power meters, and speed/cadence sensors. Because it uses the standard Bluetooth profiles, it's device-agnostic across brands like Polar, Garmin, Wahoo and Coospo. Each athlete's phone reads its own sensors over Bluetooth (roughly a 10-metre range).

Power (watts) reflects effort instantly, while heart rate lags real effort by 20–30 seconds. Serious cyclists train by power, so Serpin uses it as the primary intensity metric and treats HR as a fallback where a power meter isn't available. Runners can use pace and HR (and increasingly running power).

Connectivity on rural and mountain roads is unreliable by design, so Serpin buffers your telemetry on the device and syncs it when coverage returns — every sample is timestamped so it replays in the correct order. On the coach side, a rider who goes offline shows their last-known position and how stale it is, rather than disappearing.

Open the Sensors tab, tap Pair new device, and select your sensor from the list once it appears. Paired devices reconnect automatically the next time you start a ride, so this is usually a one-time setup. Make sure Bluetooth is on and your sensor is awake (put on the HR strap, spin the cranks, etc.).

Serpin is built for 2–4 hour sessions. It keeps streaming with the screen off using an efficient background service and minimises work on each update, so battery lasts the session. For very long days, a small top-up battery pack is still a good idea.

No. Each athlete's phone reads its own sensors locally and streams the data to the cloud. As a coach you subscribe to the live squad feed — you see everyone's position and effort on one map without any direct Bluetooth connection to their gear.

You can request deletion of your account and associated data at any time by emailing us. You can also revoke Bluetooth, location and camera permissions in your device settings to disable the corresponding features. See our Privacy Policy for full details on your rights.