Wrist firmware · reclaimed
The band wakes back up.
OpenStrap Edge pairs over Bluetooth, decodes your band, and computes sleep, recovery, and strain entirely on the phone. No account, no cloud, no subscription tail.
Strain
4.2
/h index
Recovery
87
percent
Sleep
7:42
deep 1:58
01 — Feature parity
Every readout you'd expect. None of the subscription.
Same band, same raw signal, same readouts. OpenStrap Edge reproduces the full feature set entirely on-device — no subscription, no account, no cloud in the loop.
02 — Core readouts
What the band still tells you
The sensor never stopped streaming. OpenStrap Edge reads the same raw signal the subscription used to interpret — and does the math locally. These are the three metrics that keep working, computed on the phone, no server in the loop.
Sleep
7:42
deep 1:58 · rem 1:34 · rest 4:10
Stages reconstructed from raw PPG and motion, scored against your own rolling baseline.
Recovery
87%
hrv 48ms · resting hr 52 · variability up
An overnight readiness index blending heart-rate variability, resting rate, and sleep depth.
Strain
4.2
peak 6.9 · load 21.4 · 24h window
Exercise load normalized to a 0–21 scale, so a hard session and a walk stay comparable.
03 — Local first
Your data never leaves the wrist to the cloud.
There is no server to audit, no account to compromise. Decoding and scoring run in-process on your phone and results live only in local storage. If the phone dies, the data dies with it — by design.
04 — Open source
Read the decoder. Ship your own.
The full stack — BLE pairing, signal decode, and metric models — is MIT licensed and public. Fork it, audit the math, or contribute a new band profile. No gated algorithms, no proprietary blobs.
05 — Compatibility
OpenStrap Edge is an independent, open-source tool. Tested on the hardware below.
06 — The strap
Keep a spare on your wrist.
The app stays free forever — this is the only thing you can buy. A replacement strap for your generation-4 band, ready to ship when orders open.
- Generation-4 compatible fit
- Sweatproof, all-day wear
OpenStrap Edge Strap
Generation-4 compatible
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