What devices does Cardiogram work with?

Cardiogram works with many popular smartwatches and phones, but compatibility depends on the device’s operating system, RAM, and optical heart rate sensor support.

📱 Supported phones

iPhones (iOS 15 or later recommended)
Android phones with access to the Google Play Store

❌ Phones without Google Play Services (e.g. some Huawei models) are not supported

⌚ Supported wearables

✅ Apple Watch

All models supported
Requires watchOS 6 or newer
ECG importing supported with Series 4 or later and iOS 17+

✅ Wear OS & Samsung Galaxy Watch

Must run Wear OS 3 or newer
Requires at least 1GB RAM
Must have an optical heart rate sensor
The Cardiogram companion app must be installed and running on the watch

Fully supported models include Samsung Galaxy Watch 4 and newer

✅ Fitbit (including Google Pixel Watch)

Any model with an optical heart rate sensor
Includes Sense, Versa, Charge, and Pixel Watch

✅ Garmin

Supported if the model includes an optical heart rate sensor
Examples: Fenix 5 series, Forerunner, Vivoactive, Venu

🏃‍♂️ Workout importing supported from:

Apple Watch (via Apple Health)
Wear OS watches (via Google Fit)
Fitbit devices (via Fitbit app)

📥 ECG importing (iOS only)

Requires iOS 17+ and Apple Watch Series 4+
ECG must be recorded and saved in Apple Health

❌ Devices not supported

Not currently compatible:

Huawei and Xiaomi smartwatches not running Wear OS
Samsung watches running Tizen OS (pre-2020)
Amazfit, Mi Band, Withings, and other non-standard OS smartwatches
Wear OS watches with less than 1GB RAM
Third-party fitness hardware that:
- Does not use an optical heart rate sensor (e.g. chest straps, bike monitors)
- Is not a smartwatch (e.g. smart scales, rings, or other wellness gadgets)

HR Straps / Bands:

Devices like Polar H10 or Garmin HRM may sync to your watch, but Cardiogram does not support them directly, and results may vary

🔮 Future compatibility

We’re exploring support for smart rings like Oura and other non-watch wearable devices in the future. Stay tuned!

💬 Not sure if your device is supported?

We’re happy to help. Just email [email protected] with your phone and watch model and we’ll confirm compatibility for you.