Halo privacy policy

Developer: Han Kim · app id com.hankimproduction.baseline · last updated November 11, 2026

Short version: I never get your data. Halo has no account, no analytics and no server of mine behind it, so there is nowhere for your readings to go.

Apple Health

You choose what Halo may read on Apple's permission screen. It can ask for heart rate, resting heart rate, breathing rate, wrist temperature, blood oxygen, heart rate variability, sleep, steps and other activity, the walking measures, cardio fitness, weight and your workouts. Reading is all it can do. It has no way to add to Health or change what's there.

What it does with them: it works out your usual range for each measure, on the phone, and shows today against that. Nothing here is used for ads or sold, and since I don't have the data I couldn't share it if I wanted to.

What's kept on the iPhone

One value per day per measure, in the app's own storage, so it doesn't have to reread years of Health every time. That file is encrypted with your passcode like the rest of the phone and I've marked it to stay out of iCloud and computer backups. Notes you write and names you give your eras are kept on the phone too.

Apple Watch, widgets, Lock Screen

These don't read Health themselves. The iPhone app hands them a small summary (today's values, your usual ranges, 30 days of ring positions) and with the watch that goes straight from phone to watch.

The subscription

Halo Plus is bought through the App Store, which is the only part of the app that goes online. Apple takes the payment and tells the app whether a subscription is active. I don't see your name, your card or your Apple Account.

Alerts

Off until you turn them on. They're local notifications made on the phone, so no push server exists.

Getting rid of it

Delete everything, in the app's Settings, wipes what Halo stored. So does deleting the app. Apple Health itself isn't touched either way. If you'd rather keep the app but cut off its access: iPhone Settings, Privacy & Security, Health, Halo.

Kids

The app collects nothing from anyone, children included.

Contact

If any of the above changes I'll update this page before the app changes. Email me at hankimproduction@gmail.com.