Terms of Use

Last updated: September 18, 2026

What is free

All soundscapes, the custom mixer, saved mixes, favourites, offline playback and the sleep timer are free. A short rewarded ad can pause advertising for one hour or unlock a Plus mixer sound for 24 hours.

Serein Plus

Plus is an optional auto-renewing subscription (monthly or yearly) that removes advertising and unlocks the Plus mixer sounds. The price and billing period shown by your store apply. Payment is charged to your Google Play or Apple account after confirmation. Subscriptions renew automatically unless cancelled in the store's subscription settings at least 24 hours before the end of the current period. Deleting the app does not cancel a subscription. Restore purchases with the same store account; Google Play and Apple subscriptions are separate and are not transferred across platforms. Refunds are handled by the store. Availability and taxes vary by region.

Content

Soundscapes and mixer sounds are built from field recordings licensed for use in this app and edited for it; illustrations are original. App content is for personal, non-commercial use. Do not extract, redistribute or resell the audio or artwork.

No medical claims

Serein is a relaxation and sleep-sound app. It is not a medical device and does not diagnose, treat or cure any condition. Keep the volume at a comfortable level, especially with headphones.

Availability and changes

We may update, add or remove sounds and features, and may update these terms. Continued use after a change means you accept the updated terms.

Liability

The app is provided "as is". To the extent permitted by law, Caitty is not liable for indirect or consequential damages arising from use of the app.

Contact

Email: [email protected]