ToneAtlas

ToneAtlas is a precision tone generator built around one idea: you have two ears - control them independently.

PER-EAR CONTROL
Play one frequency in your left ear and another in your right. Independent waveform, volume, mute and phase for each ear, with one-tap swap. Invert or phase-shift the right channel to test speaker wiring and stereo imaging.

FULL SPECTRUM: 0.1 Hz - 100 kHz
Go far beyond human hearing. Every slider shows where you are in the spectrum - and when you leave the human range (20 Hz - 20 kHz), ToneAtlas tells you who can still hear it: elephants and whales in the infrasound, dogs, cats, bats and dolphins in the ultrasound, and the scientific instruments that detect what no animal can.

BRAINWAVE BEATS
Binaural beats with Delta, Theta, Alpha, Beta and Gamma presets - plus monaural and isochronic modes that work on speakers. Adaptive sessions glide the beat frequency over time, easing you from relaxed to asleep.

SOUND TOOLKIT
- Frequency sweeps (log/linear) for testing speakers and headphones
- White, pink and brown noise - even a different color per ear
- Harmonic layers: stack up to four oscillators
- Anti-aliased square, saw and triangle waveforms
- WAV export at up to 96 kHz
- Feel the bass: haptics synced to sub-120 Hz tones

HEARING TOOLS
- Guided tinnitus frequency matching
- Ear balance test with CSV export
- Channel check and speaker-cleaning tone
- Library of known frequencies: mains hum, the "mosquito tone", dog whistles and more

AND MORE
Sleep timer with fade-out, curated preset library, shareable presets via QR code, Siri Shortcuts, background playback, oscilloscope view.

Free for 30 days, then a single lifetime purchase. No subscription. No ads. No data collection.

Note: ToneAtlas is not a medical device. Hearing and tinnitus features are informational only. Headphones are required for per-ear and binaural features.