| Bangle.js 2 | Polar Vantage V3 | |
|---|---|---|
| Score | 85/100 (Great) | 55/100 (Good) |
| Official API | Open API (25/25) | Open API (25/25) |
| Data export ⚡ | Local raw files (25/25) | Full account export (15/25) |
| Gadgetbridge / open firmware ⚡ | Supported (20/20) | Not supported (0/20) |
| Home Assistant | None (0/15) | None (0/15) |
| Subscription | Not needed (15/15) | Not needed (15/15) |
| Subscription | None | None |
⚡ = where they differ.
Bangle.js 2
Open-source, hackable JavaScript smartwatch. Full Gadgetbridge support and no account at all. The gold standard for data ownership, traded off against polish and sensors.
API · Export · Home Assistant
Polar Vantage V3
Polar AccessLink is a public API you can register for. Data is exportable from Polar Flow. No subscription. Gadgetbridge supports only Polar's HR straps.
API · Export · Home Assistant
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Scores come from each device's cited sources, last verified 2026-10-20. See how we score.
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