Supported devices
NOOP talks to the hardware you already own, straight over Bluetooth. No bridge box, no account, no Oura or WHOOP app sitting in the middle. WHOOP is the tested path, and the list is growing one honest step at a time.
The support matrix
We would rather tell you exactly where each band stands than paint everything green. Here is the honest state of play.
Every path above is local Bluetooth only, or an offline file you already hold. Nothing is uploaded, nothing needs an account, no vendor app sits in the middle. NOOP is an independent project and is not affiliated with WHOOP or Oura.
How the connection works
NOOP pairs with your band the same way a heart-rate monitor pairs with a bike computer. The signals land on your phone or Mac, and that is where they stay.
NOOP reads your strap over Bluetooth Low Energy directly. There is no companion bridge, no vendor login screen and no middle service to go through.
Heart rate, HRV and motion become Charge, Effort and Rest using on-device engines. The maths happens on the same device that holds the data.
There is no server to sign in to and nothing is ever uploaded, so there is nothing to breach. Your heart and your sleep stay on your device. Use NOOP fully offline, in flight mode if you like.
How NOOP speaks to a band
A strap you own broadcasts over Bluetooth. NOOP reads those bytes, checks them, decodes them and stores them on your phone or Mac. The pipeline only ever flows one way, and it never reaches a server, because there is no server.
Read it left to right: Bluetooth in, your screen out, and not a single hop off your device in between. The struck-through step is the one a subscription app needs and NOOP never takes.
The protocol, plainly
Each strap hides its real data behind its own Bluetooth service rather than a standard profile. That protocol was understood through open community reverse engineering, then re-verified on real hardware. Each generation does it a little differently.
The 4.0 exposes a hidden Bluetooth service alongside the standard ones. NOOP triggers a quiet, no-PIN bond, then reads its data frames. Every frame is wrapped in a 0xAA envelope with a small header check and a full payload check, so a corrupt read is caught and dropped, never shown to you.
The 5.0 and MG moved to a different Bluetooth service with an encrypted link and a different header check. NOOP brings the bond up first, then reads live heart rate today, with the deeper metrics being mapped against real straps rather than guessed. Same local, on-device, no-account model as the 4.0.
The privacy spine
No account. No cloud. No server, so there is nothing to breach. No tracking, no analytics, no ads. The most personal data there is, read straight off your band and kept on hardware you own.
NOOP is an independent, open project and is not affiliated with WHOOP or Oura. Not a medical device. Decoded values are approximate, local estimates. Protocol details understood through open community reverse engineering and re-verified on hardware you own.
You hold the keys
Connecting a band is a setting on your own phone or Mac. You choose what to pair, what to read and what to keep. There is no profile in a vendor cloud and no sign-in wall before you can see your own numbers.
Whether you wear a WHOOP, slide on an Oura ring, or strap a chest belt across for a hard session, it all reads into one calm app that you own outright. No second account, no second subscription.
Device by device
Exactly what you get today, and what is still being built. We mark the gaps as plainly as the wins.
The reference device, tested end to end
This is the path everything else is measured against. NOOP reads the 4.0 over local Bluetooth and computes the full set of scores from its raw signals, on your device.
Newest generation, deepening
The 5.0 and MG connect and stream live heart rate today. The richer derived metrics are being built out as we verify each one against real hardware rather than guessing.
Read locally, no Oura app
NOOP speaks to the ring directly over Bluetooth, with no Oura account and no cloud sync. It is early and labelled beta, and capability varies by generation, but it already pulls real signals onto your device.
Polar, Wahoo, Coospo, Garmin HRM and more
Any strap that broadcasts the standard Bluetooth heart-rate service works for live sessions. NOOP reads beat-to-beat heart rate and R-R intervals, the raw material for HRV, with no vendor app at all.
One app, every band
A WHOOP, an Oura ring or a chest belt all feed the one place. Your day, your scores and the maths behind them, read straight off the band and shown on a screen you own.
Real screens from NOOP. The same app reads a WHOOP, an Oura ring and a generic Bluetooth strap, all locally.
Import lane
Some bands are easier to read after the fact than live. NOOP can import the history you already own, completely offline. For the Xiaomi Smart Band, it reads the data the Mi Fitness app has already saved on your phone, no Xiaomi account and no Bluetooth pairing needed.
On the roadmap, said plainly
Got a band you would like NOOP to read, or a question about how it talks to yours? Drop a line to thenoopapp@gmail.com or open an issue on GitHub.
Get NOOP
Free on Mac, Android and iPhone. No store account, no card, no catch.
NOOP