NOOP is free, and it stays free. Nothing here is a paywall.
NOOP is a standalone, fully offline companion app for WHOOP straps (4.0 and 5.0). It pairs directly with the strap over Bluetooth, stores everything on your own device in SQLite, imports your existing WHOOP CSV and Apple Health history, and computes recovery, strain, HRV, and sleep locally — no WHOOP account, no cloud, no subscription. That includes every feature: live data, breathing biofeedback, the haptic interval timer, automations, importing your whole history, and all of the analytics. There is no "pro" tier, no trial, no locked screen, and no nag. The app never asks you to pay to do anything.
This page exists only because people kept asking how to chip in. If the app saved you a subscription and you want to, you can. If you don't, nothing changes — and you'll never be asked twice. The same addresses are shown in-app under the Support screen, each with a scan-to-donate QR code.
Honestly, though — if you can, please do. Keeping NOOP free, anonymous, and off the cloud means there's no company, no subscription, and no investor behind it — just one person covering the bills out of pocket. A little support genuinely decides whether the Windows, Android, and iOS builds get finished, and it's the difference between this being a one-off and an ongoing thing. Crypto is the only way to contribute, on purpose: staying anonymous rules out PayPal, Patreon, or anything with a name attached. That's not a hurdle — it's quick, global, and private for both of us.
Not affiliated with WHOOP. NOOP is an independent, unofficial interoperability project. It is not affiliated with, endorsed by, or connected to WHOOP, Inc. "WHOOP" is used only to identify the hardware NOOP talks to. NOOP is not a medical device — derived metrics are approximations, not clinical data. See
../DISCLAIMER.md.
You don't have to, and the project is built so you never need to. But the work is ongoing and unpaid, and donations go toward more of it:
- A Windows build — bringing the same offline, local-first experience to PC.
- An Android app — the protocol facts NOOP relies on are portable; an Android target is the next platform after macOS and iOS.
- More features and polish — deeper analytics, broader strap coverage, and improvements to the existing screens.
- Test hardware and time — straps, devices, and the hours to keep the reverse-engineering work current as firmware changes.
Donations are a thank-you, not a transaction. Nothing about the app, your data, or your access depends on them.
All four are standard receiving addresses on their respective networks. Pick whichever you already hold — there's no preference. Always copy the address in full and double-check the first and last characters before sending. Crypto transactions are irreversible, and only ever send a coin to its matching network.
| Coin | Network | Address |
|---|---|---|
| BTC | Bitcoin | bc1qn2gkl7wslwpws06mvazjn2uu689zlkv7kg3kf5 |
| ADA | Cardano | addr1qxsju3y0mlke2h6h2g6qgnq4r3jstngtyjxs0nnp5zrv28zv8p5rgzruxyjz33j9k23pffta8z639e2snjdd4vcetfqsn4vwr3 |
| ETH | Ethereum | 0xd64D508b531c4b1297Ca4023C774e0E97aA67B7F |
| XRP | XRP Ledger | rpvijHi2nVY9WWAJhojsAX5tJmHdmLtFhq |
Bitcoin (BTC)
bc1qn2gkl7wslwpws06mvazjn2uu689zlkv7kg3kf5
Cardano (ADA)
addr1qxsju3y0mlke2h6h2g6qgnq4r3jstngtyjxs0nnp5zrv28zv8p5rgzruxyjz33j9k23pffta8z639e2snjdd4vcetfqsn4vwr3
Ethereum (ETH)
0xd64D508b531c4b1297Ca4023C774e0E97aA67B7F
XRP (XRP Ledger)
rpvijHi2nVY9WWAJhojsAX5tJmHdmLtFhq
The ETH address is a standard EVM address, so it also receives on Ethereum-compatible networks if that's what your wallet uses — but when in doubt, send on Ethereum mainnet. The XRP Ledger uses destination tags for some exchange accounts; this is a self-custodied address and needs no destination tag.
- Not a subscription. One-off, whenever you like, never recurring.
- Not required. Every feature works fully without paying anything.
- Not a license. You don't owe anything to use, fork, or build NOOP — see
../ATTRIBUTION.mdfor the open-source work it stands on. - Not tied to your data. NOOP has no server and no account. There is nothing to "unlock" and no record of who has or hasn't donated.
If you'd rather contribute without money, that's just as welcome: open an issue, file a bug, send a pull request, or help test on hardware you own. That kind of help moves the project forward as much as anything.
Questions, feedback, or bug reports: thenoopapp@gmail.com
NOOP is built on prior open-source reverse-engineering — chiefly
johnmiddleton12/my-whoop (WHOOP
4.0 protocol) and b-nnett/goose (WHOOP 5.0
protocol). It exists so that someone who owns a WHOOP strap can read their own
biometric data from their own device, on a machine they control. Keeping it free
and unpaywalled is the whole point. Donations help, but the project's promise —
your strap, your data, your machine — never has a price tag attached.
Thank you for even reading this far.