NOOP FAQ: your questions, answered

NOOP is a free, independent companion app for WHOOP straps. It connects to a WHOOP 4.0, 5.0 or MG strap over Bluetooth, stores everything on your own phone or Mac, and calculates its own recovery (Charge), strain (Effort) and sleep (Rest) scores on the device, with no WHOOP account and no cloud.

NOOP is made by an anonymous group of volunteer developers who publish as NoopApp, building on earlier community work that documented how WHOOP straps communicate. The project lives at github.com/ryanbr/noop. This guide site is run separately and isn't part of the project.

Yes. NOOP costs nothing, has no subscription, no in-app purchases and no ads.

Its full source code is public, under the PolyForm Noncommercial 1.0.0 license. That lets anyone read, run, change and share it for personal and other non-commercial use, but not sell it, which is why the developers call it source-available rather than open source.

No. NOOP is independent and isn't affiliated with, endorsed by or connected to WHOOP, Inc. The name WHOOP is only used to say which straps it works with.

NOOP never signs in to WHOOP, so it doesn't need a WHOOP account to work. You do need a WHOOP strap you own. The developers ask that you only use NOOP with your own device and not in breach of any agreement that applies to you.

No. NOOP doesn't log in to WHOOP, bypass a paywall or remove any copy protection. It reads data a strap you own sends over Bluetooth, and calculates its own scores from it.

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No. Its numbers are estimates worked out on your device from published methods. They aren't clinically validated and aren't medical advice.

The WHOOP 4.0 is fully supported: live heart rate, history sync, and Charge, Effort and Rest. The WHOOP 5.0 and MG stream live heart rate today; their deeper sleep and recovery data is still being decoded.

Partly. Live heart rate works and is confirmed on real straps. Recovery, sleep stages, blood oxygen and some other overnight data are still being worked out, so those screens can be empty or rough. Importing your WHOOP export fills in your history.

Experimentally, on iPhone and Android. It reads overnight heart rate, Oura's own sleep stages, skin temperature and motion. HRV and breathing rate can't be read from the ring's data. In the standard setup NOOP takes over the ring, so the Oura app can no longer control it until you factory-reset it.

Standard Bluetooth heart-rate straps, such as chest straps, work as an experimental extra: they stream live heart rate and HRV, but not the sleep and recovery data a WHOOP provides.

Android phones with Android 8.0 or newer, iPhones with iOS 17 or newer, and Macs with macOS 13 or newer (Apple silicon or Intel). All need Bluetooth.

No. On a Windows or Linux computer, install NOOP on your phone instead.

You can install it on several, but a strap stays paired with only one device at a time. To move your data between devices, use a backup. See Move NOOP to a new device.

Publishing in the stores needs a developer account tied to a real identity, and NOOP's developers keep the project anonymous. So it's installed directly instead: an APK on Android, SideStore or AltStore on iPhone, and a downloaded app on Mac.

The full source code is public, and every download on this site comes from NOOP's official GitHub releases. Your device will still warn you because NOOP isn't signed by a store developer account; that's about the missing signature, not anything in the app. The real risk is fake copies, so only download from the official source.

Play Protect flags apps from developers it doesn't know. Tap More details, then Install anyway. If that button is missing, see the other fixes.

Only once, to set up SideStore or AltStore. After that, SideStore installs, updates and refreshes NOOP on the phone by itself.

No. SideStore and AltStore use Apple's free developer signing with your own Apple ID. Nothing about your iPhone changes.

Apps signed with a free Apple ID last 7 days. SideStore or AltStore renews them in the background; if it didn't, open it and tap Refresh All. Your data is kept. More

It isn't. NOOP isn't notarized by Apple, so macOS flags the download. Use Open Anyway in System Settings → Privacy & Security, or run xattr -dr com.apple.quarantine /Applications/NOOP.app in Terminal. Step by step

Usually the official WHOOP app is still holding it. Fully close the WHOOP app, wear the strap close to your device, and scan again. A 5.0 or MG also needs pairing mode: tap it until its lights flash blue.

WHOOP straps don't appear in phone or Mac Bluetooth settings. That's normal. Pair them from inside NOOP.

Not with one strap at the same moment. The strap keeps its secure link with one app at a time, so while it's paired with NOOP, the WHOOP app won't get its data.

Close NOOP or turn off Bluetooth on that device, then pair the strap in the WHOOP app again. It may need setting up there from scratch. Your NOOP data stays where it is.

A few minutes. The strap sends roughly its last two weeks of stored data while it's close to your device. Live heart rate shows straight away.

Not unless you set something up to. NOOP has no server, no account and no tracking. The only automatic connection is a daily update check, which sends no health data and can be turned off in Settings → About. Every detail

No. There are no analytics, crash reporting, ad identifiers or tracking libraries in the app.

NOOP relies on your device's own encryption (FileVault, iPhone and Android data protection) and keeps its database in private app storage. Backups and exports you make are plain, unencrypted files.

On Android, use Backup & Sync with a daily auto-backup. On iPhone and Mac, use Settings → Backup & restore → Export…. Backup guide

Yes. Request a data export from WHOOP and import the .zip in NOOP's Data Sources. It takes about a minute. Import guide

Nothing until you add your own AI provider. Then it sends your question and, only with separate consent, short summaries of recent metrics, straight to the provider you chose. A local model keeps everything on your network.

NOOP's three daily scores, each 0 to 100: Charge is recovery, Effort is strain and Rest is sleep. How they work

Charge needs at least four nights of HRV to learn your baseline. Don't tap Recalibrate baseline while you wait; it restarts the count. Importing your WHOOP export skips the wait.

67 or higher is green (well recovered), 34 to 66 is yellow, and under 34 is red. It's relative to your own normal.

NOOP uses the lowest steady level of your night; WHOOP's figure is closer to your whole-night average. A gap of 5 to 8 bpm is normal.

WHOOP's formulas are private. NOOP calculates its own scores with published methods, so they move the same way but rarely match exactly. Days imported from a WHOOP export show WHOOP's own values.

Yes: a weekly Fitness Age (a comparison of your fitness with the typical person, not a biological age) and a daily Stress score from 0 to 3. Details

On Android, install the new APK over the old one. On iPhone, SideStore or AltStore updates it from NOOP's source. On Mac, replace the app in Applications. Your data stays in every case.

No. It checks once a day for a new version and tells you, but it never installs anything. On iPhone, SideStore or AltStore can install updates for you.

In NOOP's release notes on GitHub, and in the app under What's new after each update.

NOOP's GitHub sometimes has a testing pre-release for people helping to test new changes. Most people should use the stable release linked on this site.

No. Updating keeps everything. Only uninstalling deletes NOOP's data, because there's no cloud copy.