Privacy

Styll plays calm focus music that is generated on your device. This page covers the website at styll.net and the Styll app on Google Play and the App Store. Both work the same way. Last updated 10 November 2026.

The short version

Styll does not track you. It has no ads, no analytics and no third-party scripts. Your music, focus hours and settings stay in your browser or app. An account is optional, and only the focus hours and saved mixes of a signed-in account leave your device.

What stays on your device

Sounds are composed live on your device. Nothing is recorded, downloaded from a stream or sent anywhere to be played. Your settings, saved mixes and focus hours are kept in your browser’s storage or in the app.

Apple Health

If you connect Apple Health in the Styll app, it reads your heart rate, resting heart rate and heart rate variability to pace the breathing and music at the start of a session, and to show your heart rate before and after it. It can also save your listening time to Health as Mindful Minutes. These readings are used on your device only. They are never sent to us or anyone else, they are not used for ads, and they are not sold. Health readings are not part of your account or its sync.

On the website, an Apple Shortcut can open Styll with the readings in the page address. That address stays in your browser history on your device, and Styll removes the readings from the address bar as soon as it reads them.

Microphone

Styll does not use the microphone.

Optional account

You can sign in with an email address and password, or with Google. Styll uses Google Firebase Authentication for this. It stores your email address and an account identifier, plus the focus hours and saved mixes you choose to keep in your account, so they appear on your other devices. Google processes sign-in under its own privacy policy. You can use Styll fully without an account.

Who else handles data

The only service that receives data from Styll is Google Firebase, and only for signed-in accounts. The website and the apps load nothing from other companies. Paintings and textures are part of the app itself.

What Styll never collects

Styll does not collect your location, contacts, photos, advertising identifiers, or any recording of the room. It does not sell data, and it does not use data to show you ads.

Children

Styll is not aimed at children under 13, and it does not knowingly collect information from them. An account needs an email address, so a parent or guardian should set one up if a child wants to use one.

Deleting your data

Clear Styll’s data from your browser, or delete the app, and everything kept on your device is gone. To delete a signed-in account, open the account dialog and choose Delete account, then tap it again to confirm. That removes the account and the focus hours and saved mixes stored with it. Anything kept only in your browser stays until you clear it.

Using Styll’s code and sounds

Styll’s code, its generated sounds, its design and its written text are the work of Ashish Saragadam and are protected by copyright. Nothing on this page or in the app gives you a licence to them beyond using Styll as intended. You may not copy, sell, rent, or redistribute the app or any part of it, and you may not reverse engineer, decompile, disassemble, or attempt to extract the source code, models or sound-generation logic of the app, except where the law allows this despite such a restriction. The painting images are separate: each keeps the licence of its museum source, and `dist/art/credits.json` lists it. This section is a summary; the full terms of use, if published, take precedence.

Changes and contact

When this page changes, the date above changes with it. Questions about privacy go to hello@styll.net, the same place as all support for Styll.