Frequency Lab: Hz & Binaural

Frequency Lab is a pocket laboratory for sound: generate frequencies, see them live and measure your voice, heart rate and breathing. Its motto is Don't believe it. Test it. Every value can be heard, seen and compared, and any claim about a frequency can be tested blind on yourself, with an honest account of chance.

FREE
- Two-tone generator from 20 Hz to 20 kHz, set to 0.01 Hz: sine, triangle, square and sawtooth, B:A ratios (octave, fifth, fourth and more), beats and binaural mode
- Harmonics 2x-12x with ready timbres, tuning A4 = 432 Hz, 440 Hz or your own
- Live views: Lissajous figure, wave and spectrum
- Voice measurement: hum for 10 seconds and see your note, stability and timbre, with a frequency signature card to share
- Blind ABX test: can you hear 432 Hz against 440 Hz? With the exact chance of guessing
- Double resonance: a drone at your voice note that breathes with you, 5 and 10 minutes, with the screen locked
- Notebook with 5 states, comparison of two states and a frequency library with sources
- Day tone widget, shortcuts on the app icon and a two-column layout on tablets

PRO EDITION (one-time purchase, no subscription; try it in three free sessions)
- Generate Pro: binaural and isochronic beats, up to 8 layers, white, pink and brown noise, smooth and stepped sweeps, sequences and WAV files
- Field, Cymatics and Observatory views
- Instrument measurement for singing bowls, tuning forks and gongs
- Heart rate with the camera or a Bluetooth chest strap (with heart rate variability), a breathing pace test and breathing rate
- All blind test protocols and blind feeling experiments over several days, with an exact sign permutation test and a 90% interval
- Practice for 20-60 minutes at your own pace, heart rate during the session, a sequence as a session
- Observatory of your measurements, comparison of up to six states, unlimited Notebook, saving and loading your data (JSON, CSV)

HONEST BY DESIGN
Physics, models and traditions are labelled. 432 Hz, solfeggio, the Schumann resonance and binaural beats are described with their origins and the size of the research behind them, and you can test them blind. Results are about you and your conditions, never a rule for others.

PRIVACY
No internet permission, no accounts, no ads, no analytics. Everything stays on your phone. The microphone and camera work only while you measure, and recordings and images are not saved.

Languages: English, Polish, Spanish, Portuguese, German, French.

Heart rate measurement needs a rear camera with a flash (the result is approximate) or a chest strap with the standard Bluetooth heart rate service.

Frequency Lab is not a medical device and does not diagnose, treat, cure, or prevent any medical condition. If you have health concerns, consult a qualified healthcare professional.

Recent changes:
First release of Frequency Lab. Generate and see frequencies: two oscillators with ratios, binaural beats, harmonics, Lissajous figure, wave and spectrum. Measure your voice, sounds, an instrument, heart rate with the camera and your breathing. Test claims yourself in blind trials with an exact account of chance. Free laboratory, one-time Pro edition, six languages. No account, no ads, everything stays on your phone. Don't believe it. Test it.