steady

Sound that stays the same, so you do not have to notice it.

Player

Ready

Volume

Pick the level that feels right to you. Output is capped so it cannot get painfully loud.

Presets

Runs entirely on your device. Nothing is sent anywhere and there is nothing to sign up for.

Not a medical device and not a treatment. The research behind this is modest, mixed, and summarised honestly in the README, including the parts that argue against it. If attention is causing real problems in your life, talk to a clinician.

Source code and the research notes