No cloud copy exists
The score is computed on your phone and watch. cowe has no server holding your HRV history — so there is no remote database to breach, sell or subpoena.
Health data that never leaves the device
An on-device recovery app for Apple Watch.
An on-device recovery app is one that computes your readiness score on your own iPhone and Apple Watch instead of on a company's server — and cowe is exactly that. It reads the HRV, resting heart rate and sleep your watch already records and turns them into one calm morning number, computed 100% locally. No cloud upload, no account, no separate band.
Lock the $15 founding price.
Recovery you own, on the Apple Watch you already have — pay once, no subscription. Join free now and lock $15 before it rises to $24.99 at launch.
One calm morning recovery score — computed on your own device from the signals your Apple Watch already records.
What does "on-device" actually mean here?
It means the math runs where the data already lives. Your overnight signals sit inside Apple Health on hardware you own; cowe reads them there, scores them there, and shows you the result — without ever copying them off the device. Concretely, on-device for cowe means:
No account to create
No email, no password, no profile in someone else's system. You grant Apple Health read access on your own device and that is the whole setup.
Works with no connection
Because nothing has to round-trip to a server, your morning reading appears in airplane mode, with no Wi-Fi, or off the grid entirely.
Why keep recovery data on the device instead of the cloud?
Because the safest data is the data that was never uploaded. Recovery metrics — how your heart and nervous system behave overnight — are some of the most intimate signals a phone can hold. The on-device model removes the whole class of risk that comes from a third party storing them.
- Nothing to leak in a breach you can't control
- Nothing to quietly resell to data brokers
- Nothing that vanishes when a company shuts a server down
- No subscription needed to keep a server running
That last point matters: a cloud recovery service has to charge you forever to pay for the servers your data sits on. cowe has no server, so it can be a one-time purchase with no subscription instead. The privacy model and the pricing model are the same decision.
What does cowe read to build the score on-device?
The same three signals your Apple Watch already records each night — read against your own baseline, not a stranger's average, and all without leaving the device.
Heart-rate variability
A read on how taxed your system was overnight. It is noisy night to night, so cowe weighs the trend against your personal baseline rather than reacting to one morning.
Resting heart rate
Steadier than HRV and read alongside it. Together they form the readiness picture, always compared to where your own numbers usually sit.
Sleep
Duration and consistency are the foundation of recovery. cowe treats the trend as directional — and is honest enough to tell you when it isn't confident yet.
New to these signals? See what your Apple Watch already tracks — a free explainer, no signup.
Is this the same as an Apple Watch recovery app?
Yes — "on-device" is the privacy angle on the broader category. If you want the full picture of how the score is built, what the morning number means and how it compares to other approaches, start with the pillar guide to the Apple Watch recovery app. The on-device design is also what makes cowe a genuinely private recovery app rather than one that merely promises privacy in a policy while still syncing to a cloud.
Common questions
Does my data ever go to the cloud?
No. cowe has no server and no account. Your signals stay inside Apple Health on your devices, and the score is computed there.
Do I need an account or login?
No sign-up, no email, no password. Grant Apple Health read access on your own device and you're set up.
Does it work offline?
Yes. The score is computed locally, so it appears in airplane mode or with no signal — the watch you own already holds the data.
Is cowe a medical device?
No. cowe is a wellness and fitness tool — a readiness signal against your own baseline. It does not diagnose, treat or prevent any condition.
How much does it cost?
cowe is a one-time purchase of $24.99 — no subscription, ever. Waitlist members lock the founding price of $15 before launch.
Keep your recovery data where it belongs — on your device.
One calm morning readiness number, computed 100% on-device. No cloud, no account, no subscription. Join the waitlist and lock the founding price.
- Pre-launch · watchOS + iOS
- 100% on-device
- Pay once