Short version

Baseline does not collect any data. There is no server. The app
makes no network requests. Your health data stays on your iPhone.

This is verifiable: the published app’s binary is scanned in CI to
confirm zero references to URLSession,
NSURLConnection, or CFNetwork before each
release. The App Store privacy nutrition label
— “Data Not Collected” — is factual.

What data does Baseline access?

With your explicit Apple Health permission, Baseline reads the
following categories only on your device, only for the
purpose of computing your insights:

• Steps, distance, active energy, exercise time, stand hours
• Workouts and workout intensity
• Resting heart rate, heart rate variability (HRV), respiratory
  rate, VO₂ max
• Body mass
• Sleep duration, sleep stages, sleep efficiency, sleep score
• Mental state (mood), alcoholic beverages, caffeine, when
  available from Apple Health or third-party apps you’ve
  connected

Baseline never requests write access to Apple Health.
Your Health app data is not modified by Baseline.

Where is your data stored?

Two places, both on your iPhone:

• Apple Health — your existing Health database.
  Baseline reads from it; we don’t touch it.
• A local SQLite file inside Baseline’s app
  sandbox. This stores derived daily summaries, the insights
  Baseline has generated, and any mood or alcohol entries you’ve
  logged in the app. iOS encrypts it at rest along with the rest
  of your app data.

Nothing is uploaded. Nothing is synced to iCloud unless you
explicitly include the app in an iCloud backup of your phone — and
even then, Apple’s encryption applies.

What about third-party apps?

Baseline can analyze data that other apps (like MyFitnessPal,
Strava, AutoSleep, Whoop, Oura) write to Apple Health. Those apps’
own privacy practices are separate from Baseline. Baseline only ever
sees the data they have already chosen to write to your Apple
Health.

Baseline does not share data with those apps. It does not send
data to their servers. It does not communicate with them at all
except through Apple Health’s local read APIs.

Analytics, crash reporting, ads

Baseline does not include any third-party analytics SDK,
advertising network, or marketing identifier. There is no code in
the app that reaches the network — no data is uploaded, ever.

Baseline has an optional, off-by-default
diagnostics setting. If you turn it on, the app records a small
local log of feature-usage events and Apple MetricKit performance
summaries (for example, crash counts and peak memory) on your
device only. Declining stores nothing; turning it off again deletes
the log. Nothing in this log is transmitted by the app — the only
way it leaves your phone is if you export the file yourself via the
iOS share sheet and choose to send it to us.

Separately, if Baseline crashes, iOS may send a crash report to
Apple per your device’s standard “Share with App Developers”
setting. Apple may share an anonymized version with us if you’ve
opted in at the system level.

How to delete your data

Inside the app: Settings → Delete all data.
This clears Baseline’s local SQLite database, all stored insights,
all logged mood/alcohol entries, and resets the onboarding flag. The
app behaves as if freshly installed afterward.

To delete the app entirely: long-press the Baseline icon on your
Home Screen → Remove App → Delete App. iOS removes the app’s entire
sandbox, including the database.

Neither action affects your Apple Health data. To remove
Baseline’s access to Apple Health: open Apple’s Health app →
Sharing → Apps and Services → Baseline → Turn Off All.

Children’s privacy

Baseline is not directed at children under 13. If you are a
parent and a child under 13 has installed Baseline, you can delete
it as described above. Because Baseline collects no data and has no
account system, there is nothing for us to delete on your behalf.

Changes to this policy

If we ever materially change Baseline’s data practices —
including ever adding a network connection — this page will be
updated and the change will be called out in the app’s
What’s New in the next release. You’ll have the
opportunity to review before updating.

Contact

Questions about this policy: Please use our main homepage to send us a note.