Common questions
One person reads this inbox, so replies are not instant — usually a day, sometimes two. Bug reports about a number that looks wrong get answered first.
support@bakuscience.com — for anything at all. If you are already in the beta, the feedback option inside the app is faster, because it attaches the context needed to look the problem up.
Which devices does Baku work with?
An Apple Watch, an Oura ring, or a Garmin — and most other trackers besides. Baku reads Apple Health, so anything that writes there can feed it: sleep, heart rate, resting heart rate, respiratory rate, blood oxygen, steps and active energy.
Garmin works this way. Turn on Apple Health syncing in the Garmin Connect app and your nights and sessions arrive in Baku like any other source. One caveat worth stating: HRV does not cross that bridge — Garmin does not publish heart-rate variability to Apple Health. Rather than invent a number, Baku drops the HRV term for those days and reweights what it did measure, and your baseline stays internally consistent because it is built from your own history either way.
Oura connects directly rather than through Apple Health, so its sleep staging and measured HRV arrive at full fidelity. An Apple Watch publishes HRV to Apple Health, so it arrives measured too.
Last night hasn’t shown up. What’s wrong?
Usually nothing — the night has not left your device yet. Baku can only read what your watch or ring has already handed over, and each of them hands it over differently.
On an Oura ring, the night waits for the Oura app. This is Oura’s design, not a Baku bug: their API publishes activity and stress in the background, but sleep is only staged once you open the Oura app. One morning we timed it — the day’s activity and six hours of ring wear were available at 10:36, and the night itself did not appear until 11:01, a few minutes after the app was opened. Open Oura and Baku is notified within about thirty seconds.
The quick tell: if today’s activity is showing in Baku but the night is missing, that is exactly this. The ring is syncing fine and Oura simply has not staged the sleep yet.
On an Apple Watch or a Garmin, the watch writes to Apple Health when it next syncs with your iPhone — usually a moment after you unlock the phone with the watch nearby. Baku also refreshes sleep, HRV and resting heart rate in the background, so most mornings it is already there before you open the app.
If it is still missing: pull down on the Today screen to force a sync. Failing that, Settings → Re-sync history re-pulls the recent window from scratch.
And if a night genuinely never arrives — the ring was charging, the watch was off — Baku leaves it out rather than scoring it. A night that was not measured is not a bad night, and it never gets filled in with a zero.
Why can’t I see a readiness score yet?
Readiness is built on seven nights of your sleep, so it arrives once that week is behind it. Until then the app shows a count of the nights still to go, so you always know where you are.
Some things take longer. Biological age appears earlier but carries a visible range that narrows as data arrives.
Can I wear two devices at once?
Yes, and it is handled deliberately. A watch and a ring measure the same night differently — not randomly, but with a systematic offset. Baku calibrates per device and attributes each night to the source that actually measured it, so switching hardware does not read as a change in you.
Where is my data stored, and is it private?
Health data is stored in a Postgres database hosted on Railway, in the United States. Connections require TLS, and access tokens for connected services such as Oura are encrypted at rest with a separate key, so a database dump alone does not hand anyone your Oura account.
It is never sold, never shared, and never used for advertising — there is no advertising side to the business. The daily written summary is produced by a model running on your iPhone, so that text is never generated in a datacentre.
How do I export or delete my data?
Both are in the app, and neither requires emailing anyone. Settings → Export my data writes the whole record to a file you can keep. Settings → Delete my data permanently removes every synced measurement, derived score, baseline and experiment.
Deletion is immediate and irreversible — there is no 30-day grace period and no copy retained. To remove the account itself as well, use Settings → Delete my account.
What does Baku actually measure?
Sleep architecture and timing, heart-rate variability, resting heart rate, respiratory rate, blood oxygen, training load, VO₂max, and a biological-age estimate built from those. Everything is scored against your own history rather than a population chart.
Is there an Android version?
No, and there is no date. Baku is iOS only. Apple Health is an iOS framework, and it is where most of the data comes from, so an Android version would be a different app rather than a port. It is not being worked on today.
How do I get in, and what is the current state?
Baku is in private beta, distributed through TestFlight and invited in small waves so the first users’ real data can be looked at properly before the next group arrives. Join the waitlist and you will get an invitation when a wave opens.
Something is wrong, or a number looks incorrect.
Please report it — wrong numbers are the useful bug reports. There is a feedback option inside the app that attaches the context automatically, which is the fastest route. Otherwise email support@bakuscience.com with your device, iOS version, and the date the number looked wrong, so the exact night can be checked.