NOOP

Your strap. Your data. Your machine. Offline, on-device, no cloud.

_{Now in the all-new Liquid Metal design: one living look across iPhone, Android and Mac.}

_{GitHub down? Every release is mirrored at noop.fans — same downloads, release for release, as a fallback.}

_{NOOP is free, account-free and ad-free — and it costs us real money to keep running (servers + development time). Only a handful of people chip in. If NOOP’s earned a place on your wrist, buy us a coffee ☕ — it genuinely keeps the lights on.}

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_{The all-new Liquid Metal look: living liquid scores, a sky that moves with your day, rebuilt on every screen. The same Today on iPhone and Android, and a metric’s own trend. One design across iPhone, Android & Mac.}

Keeping NOOP alive

NOOP is free, forever — no account, no cloud, no subscription, every feature unlocked, no nag. That doesn't change.

But here's the honest reality, up front: NOOP is built and maintained by one person, out of pocket. Building interoperability support for WHOOP's hardware — and keeping up as its firmware changes — takes real time and real test hardware. The project continues if the people who use it help fund it. If that doesn't happen, it can't. No drama, no guilt — just the maths of an unfunded project.

📰 Featured in AOL · Yahoo · Android Authority · TechRadar · BGR · Android Central · Android Police · Notebookcheck · Trusted Reviews — and used by thousands. If even a small fraction of them tipped, NOOP's future would be secure for a long time to come.

If NOOP saves you a subscription, or you just want WHOOP 5.0/MG support finished and the work to keep going, chipping in is what genuinely decides that. It's optional, one-off, and tied to nothing about your data or access — there's no server and no record of who has or hasn't.

How to donate — 2 minutes, even if you've never touched crypto

Donations are crypto-only, on purpose: staying anonymous (for the project and for you) rules out PayPal, Patreon, or anything with a name attached. If you don't already hold any:

1. Install a mainstream exchange app — Coinbase, Binance, Kraken, or Cash App (Cash App handles Bitcoin directly).
2. Buy some Bitcoin (BTC) or Ethereum (ETH) — a suggested $50+ genuinely keeps the project alive (it's a fraction of a year's WHOOP subscription). Anything is appreciated, but $50+ is what moves the needle.
3. Tap Send / Withdraw, paste the matching address below, and send. That's it. (Only ever send a coin to its own network.)

⚠️ XRP donors: this address requires the destination tag 3338312747. XRP sent without the tag cannot be credited and may be lost — most wallets and exchanges have a "Destination Tag" field, paste it there.

Each address also has a scan-to-donate QR code in the app under Support (and they're listed in docs/DONATIONS.md). Always copy the full address and double-check the first and last characters; crypto transactions are irreversible, and only ever send a coin to its own network.

Can't or would rather not? Also genuinely valued: ⭐ star this repo, file a good bug report, share a strap log, test on hardware you own, or just tell another WHOOP user. That moves NOOP forward too. Want to help directly? → Roadmap & help wanted lists exactly what we need — some of NOOP's biggest blockers are data only your strap can provide (a single raw frame capture can unlock a feature for everyone on that firmware).

Download

Pre-built apps you can run right now:

First launch on macOS. NOOP is not notarized by Apple — notarization needs a paid Apple Developer ID tied to a real identity, which doesn't fit an anonymous, free project. The app is sandboxed and ad-hoc code-signed, and the full source is here to inspect. Because it isn't notarized, macOS Gatekeeper blocks it on first open (you may see "damaged" or "unverified developer" — that's the download quarantine flag, not real damage). To open it, do one of these once:

• Terminal (most reliable): drag NOOP.app to Applications, then run xattr -dr com.apple.quarantine /Applications/NOOP.app and open NOOP normally.
• No Terminal: double-click NOOP (it'll be blocked), then open System Settings → Privacy & Security, scroll to the bottom, and click "Open Anyway" next to NOOP. (On macOS 14 and earlier you can also right-click the app → Open.)

Prefer to avoid this entirely? Build from source — see Quickstart.

Installing on Android (Play Protect blocked it?). NOOP isn't on the Play Store — it's an unsigned, source-available APK you sideload, because the project is anonymous and has no paid Play identity to publish or sign under. So Android treats it as an "unknown app" and Google Play Protect may warn or block on install (most stubbornly on stock Pixel / recent Android). Nothing is wrong with the file — it's just missing a Play signature. To get it on:

• Tap "Install anyway." When the warning appears, choose More details → Install anyway.
• No "Install anyway" button? It can vanish after a first install + uninstall. Grant the source directly: Settings → Apps → Special app access → Install unknown apps, pick the browser or file manager you're installing from, turn on "Allow from this source", then open the APK again.
• Still blocked by Play Protect? It's your call to make for an unsigned app you trust: open the Play Store → your profile icon → Play Protect → ⚙ Settings, toggle "Scan apps with Play Protect" off, install NOOP, then switch it back on.
• Reinstalling is safe. Uninstalling and installing again won't hurt anything — NOOP keeps all data on-device with allowBackup=false, so a reinstall simply starts fresh. There's no cloud copy to lose either way.

Prefer to build it yourself? See docs/BUILD.md.

Everything runs offline. The only feature that ever uses the network is the optional AI Coach, and only with your own API key.

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 and Apple Health history, and computes recovery, strain, HRV, and sleep locally, with no WHOOP account and no WHOOP cloud.

It is built on prior community interoperability work and exists for one reason: to let someone who owns a WHOOP strap read their own biometric data from their own device, on a machine they control.

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. Use it only with a device you own, and not in breach of any agreement that applies to you. NOOP is not a medical device; every derived metric is an approximation, not clinical data. See DISCLAIMER.md.

Contents

• Why NOOP
• Features
• Platform status
• Architecture
• Quickstart (macOS)
• How your data flows
• Privacy
• Attribution
• Support (optional)
• Disclaimer
• License
• Docs

Why NOOP

You bought the strap. The biometric stream it produces is yours. NOOP is built on that premise:

• Own your data. NOOP reads heart rate, R-R intervals, SpO₂, skin temperature, respiration, accelerometer/gravity, battery, and event data straight off the strap over Bluetooth and writes it to a local SQLite database. Nothing is uploaded anywhere.
• Account-free and local. NOOP never logs into a WHOOP account and never hits a WHOOP server. It does not bypass any login, paywall, or DRM; it simply talks to a device you own and reads data you generated.
• Bring your history. Already have years of data in the official app or in Apple Health? Import the WHOOP CSV export and/or your Apple Health export.xml once, and it's permanently on your machine.
• Transparent math. Recovery, strain, HRV, and sleep are recomputed on-device from documented, citable methods (Task Force 1996 HRV, Karvonen %HRR, Edwards / Banister TRIMP, Tanaka HRmax, and so on). The algorithms are approximations of — not reproductions of — any proprietary model, and every analyzer file documents exactly what it does.