ToneMask

Find your frequency, then remove a band centred on it.

Start with your volume low. High-frequency tones and noise are uncomfortable at volume.

1 · Find your frequency

Tone

4000 Hz

Sweep until the tone sits at the same pitch as what you hear, then set it.

Master

0.60

Brown bed

0.30

Notch width

500 Hz

Carrier

Notch width, pink and brown carriers, and playback with the screen locked come with Lifetime.

Ears

Left

4000 Hz

Right

4000 Hz

Set a different frequency for each ear with Lifetime.

Checking licence…

What it is: A noise and tone generator: sweep a tone to find a frequency, then play noise with a notch filter that removes a band centred on it.
Free: Tone finder (500–14,000 Hz) and notched white noise, 500 Hz notch, ears linked. No account.
Lifetime: $29 one-time (USD). Independent left/right frequency, adjustable notch width, pink and brown carriers, playback with the screen locked.
No account: No subscription and no sign-up. The licence key is checked on your device, works offline, and can be pasted on any of your devices.
Delivery: After Stripe checkout your licence key is shown on screen and unlocks this device; it is also emailed as a backup.
Runs on: A modern browser on phone or desktop. Install it to the home screen to keep it offline.