A Solfeggio sleep mixer that stays on your phone.

Ambiance Pro unlocks the full Solfeggio set — 174, 285, 396, 417, 528, 639, 741, 852, and 963Hz — plus 432Hz. Each tone is its own channel, so you can sit 528Hz under rain or brown noise instead of listening to a tone in a vacuum.

The mixer is offline. Audio never leaves the device. You download the Android APK from this site, try the free sounds, then pay $20 NZD once if you want the tones and longer fade timers.

After Stripe checkout you get a code like AMB-XXXX-XXXX. Paste it in the app. No Google account, no subscription, no cloud library that disappears later.