NOOPThe band should serve you
You bought the strap. Reading what it measures should not cost a subscription on top. NOOP turns the hardware you already own into something that works for you, not for a billing cycle.
Why we built this
The band is yours.
The data should be too.
You paid for the hardware on your wrist. Your heart rate, your sleep, your recovery, that is about as personal as data gets. We did not think it should sit on a company's servers, locked behind a monthly fee. So we built the app we wanted to use: one that reads your strap, does all the maths on your own device, and asks nothing of you. No account, no cloud, no catch. NOOP is free, and it stays free.
No account
No cloud
Open source
Free forever
What we believe
Three simple convictions.
Your data lives with you
Your most personal signals belong on your device, not in someone else's cloud. NOOP keeps everything local, in a file you own and can export at any time. There is no server to breach, because there is no server.
Good tools can be free
Useful software does not have to be a business with your habits as the product. NOOP is free, open and honest by default. The whole project exists to prove that point.
What those beliefs built
The app, not a pitch.
Every principle above is something you can see on screen. The same numbers the best obsess over, read straight off your band and worked out on your own device.
Today, the feature menu, a score breakdown and settings. Nothing here phones home.
A quieter relationship with your data.
No notifications nudging you toward a renewal. No dashboard you rent. Just your own numbers, on your own device, the morning after. You wake up, you check in, and the rest of it stays out of the way.
The longer life of a band
The most sustainable wearable is the one already on your wrist.
The world made 62 million tonnes of electronic waste in 2022, up 82% since 2010, and it is on track for 82 million tonnes by 2030. Less than a quarter of it, just 22.3%, was formally collected and recycled. A wrist band is a tiny part of that pile, but the logic is the same: about three in ten fitness trackers and smartwatches end up abandoned, often within two or three years, glued shut and awkward to repair.
Here is the part that sits badly with us. A lot of that turnover is not because the hardware failed. It is because a subscription lapsed, or a newer model launched, and a perfectly good sensor on your wrist quietly became e-waste. We did not want to build something that worked that way.
62Mte-waste generated in 2022, up 82% since 2010
82Mtprojected by 2030 on current trends
22.3%formally collected and recycled
~30%of fitness trackers end up abandoned
No forced upgrade. NOOP keeps the strap you already bought useful for years. Nothing here pushes you toward a newer model.
No subscription that can brick it. Cancel a paid app and a band can go dark. NOOP asks for no payment, so there is nothing to lapse.
No data centre per reading. The maths runs on your device, so a glance at your recovery does not spin up a server somewhere.
Open and local, so it can outlive us. The source is public. NOOP does not depend on any one company staying in business.
E-waste figures: UN / ITU / UNITAR Global E-waste Monitor 2024, ewastemonitor.info. Wearable abandonment is an industry estimate. NOOP is not a recycling scheme; keeping hardware alive longer is simply part of why it exists.
Privacy is the spine
Nothing ever leaves your device.
This is not a setting you switch on or a promise on a marketing page. It is how NOOP is built. There is no account, no cloud, no server, so there is nothing to breach, nothing to sell and nothing to leak. Your heart, your sleep, your recovery, the most personal data there is, stay on the device in your hand. You own them, and you can export them whenever you like.
Bluetooth inNOOP reads a strap you own over its private Bluetooth link, on your device.
DecodeFrames are unpacked and checksum-verified locally. No network is ever touched.
Local storeSamples land in an on-device database (SQLite) that lives only on your phone or Mac.
On-device mathsRecovery, strain, sleep and HRV are computed by pure local analytics. Still no server.
Their way: the cloudThe usual route uploads your signals to a company's servers. NOOP simply skips this step.
Your screenThe numbers appear on your device and stop there. Yours to read, keep and export.
One direction, strictly on-device: Bluetooth bytes, decode, local database, local analytics, your screen. Nothing is ever sent off the device. The strap itself holds roughly 14 days of history, which NOOP re-reads locally so your record fills in without a single upload.
No accountnothing to sign up for
No cloudnothing leaves the device
No trackingno analytics, no ads
No servernothing to breach
How it reads the band, honestly. NOOP talks to a strap you own over Bluetooth and never touches WHOOP's or Oura's servers. This is interoperability, not impersonation. The strap's private Bluetooth protocol was understood through open community reverse-engineering and re-verified on real hardware, so NOOP can read the data your own device already records.
None of this changes the spine of the project: it all happens on your device, for you, and stops there. NOOP is an independent project, not affiliated with WHOOP or Oura, and it is not a medical device. The numbers it shows are careful, approximate estimates, and we say so plainly.
What we hold to
The principles, in plain words.
Not a mission statement. A short list of rules the app actually follows, and that you can check for yourself.
01
On-device, always
Every calculation runs on your phone or Mac. Your data is never uploaded, because there is nowhere to upload it to.
02
Free, forever
No paywall, no pro tier, no trial that expires. Every feature works for everyone, at no cost, with no nag.
03
No account
Nothing to sign up for, no email to hand over. You open the app, pair your band, and you are in.
04
You own your data
It sits in a plain file on your device. You can read it, back it up, or export it whenever you like. It is yours to keep.
05
Open and readable
The source and the maths are out in the open. You can read how a score is computed, run it, and check our working.
06
Honest by default
Every score carries a confidence tier. When NOOP cannot compute a number honestly, it shows nothing rather than fake one. No invented statistics.
07
Privacy first, hence anonymous
The project stays anonymous on purpose. No names, no faces, no data on you. We let the work speak for itself.
08
Funded by donations, not data
There is no investor and nothing to sell. The bills are covered by people who choose to chip in, and only ever optionally.
In practice
Quiet by design, honest by default.
These are not slogans on a wall. The app keeps your signals on your device, shows a confidence tier on every score, and stays silent rather than inventing a number it cannot stand behind. Less noise, more truth, and nothing held over you.
On‑deviceevery calculation
Yoursto read and export
Who builds NOOP
A small independent team that lets the work speak.
NOOP is made by a small independent team, in the open, for free. We stay anonymous on purpose. The point was never to put a face or a brand in front of you, it was to build something genuinely yours and then get out of the way. There is no company behind this, no investor to answer to, and no growth target dressed up as a wellness feature. Just the app, the science behind it, and the source you can read.
Keeping NOOP free, anonymous and off the cloud means the project runs on goodwill and the occasional donation, never on your data. We would rather be honest about what the app can and cannot do than impressive about what it claims. NOOP is not affiliated with WHOOP or Oura, and it is not a medical device. The derived numbers are careful approximations of published science, and we say so plainly.
0accounts to create
0cloud servers
0investors to answer to
£0forever
If it is useful to you
Take it, fork it, or help keep it going.
NOOP costs you nothing and never will. The source is open for anyone to read, build or improve. And if the app earns a place in your day, a one-off donation helps cover the bills and the test hardware, with no company in between. Entirely optional, and you will never be asked twice.
Questions, ideas or a bug to report? Reach the project, anonymously and directly, at thenoopapp@gmail.com.