Signal generators · precise test signals
Tones, sweeps, noise, and waveform generators. Every generator runs on the Web Audio API in your browser — nothing is uploaded, and no sound plays until you press play.
Signal generators
- Binaural Beats — Sleep & FocusGenerate binaural beats across delta, theta, alpha, beta and gamma bands with pure stereo isolation. Presets for sleep and focus. Free in your browser.
- Brown Note Test — Myth ExplainedExplore the brown note myth with sub-20 Hz infrasound demos, speaker excursion notes and honest limits. Science, not pranks. Free in your browser, no download.
- DTMF Generator — Dial Pad TonesGenerate DTMF touch-tones on an interactive dial pad with standard dual-tone pairs and event logging. For telephony and IVR testing. Free in your browser.
- Free Online Metronome — Tap TempoFree online metronome drawn as a real mechanical instrument: drag the weight to set 30–240 BPM, tap tempo, 2/3/4/6 meters, eighth/triplet/16th subdivisions and drift-free Web Audio timing. Stage mode included.
- Frequency Sweep Generator — FreeFree frequency sweep generator with linear, logarithmic and percussive sine sweeps between any frequencies. Adjustable time. Free in your browser, no download.
- Instrument Tuner — Mic DetectionFree online instrument tuner with microphone pitch detection, cents needle and presets for guitar, violin and more. Private analysis. Runs in browser.
- Noise Generator — White to GreyFree noise generator with white, pink, brown, blue, violet and grey sounds plus level control and live readout. For testing and masking. Runs in browser.
- Online Tone Generator — Free ToolOnline tone generator drawn as a laboratory signal generator: drag the dial for any frequency from 20 Hz to 20 kHz, sine, square, sawtooth and triangle waves, note readout, dual-tone mix, pan, stage mode and free WAV export.
- Perceptual Sine Sweep — 20 Hz–20 kHzPlay a perceptual sine sweep from 20 Hz to 20 kHz in equal hearing bands with even pitch steps and extra bass dwell. Free in your browser, no download.
- Shepard Tone — Endless IllusionHear the Shepard tone endless pitch illusion rise or fall forever with octave-stacked glides. Famous film-tension effect. Free in your browser, no download.
- Sleep Sounds — White, Pink, BrownSleep sounds with continuous white, pink and brown noise plus 15–60 minute timers and gentle fade-out. Mask night noise. Free in your browser, no download.
- Violin Tuner Online — A440 & A432Tune with violin, guitar and orchestral reference tones in A440, A432 and 415 Hz plus solfeggio presets. Listening reference, no mic needed. Free in browser.
- Waveform Generator — Custom WavesDesign custom waveforms online with Fourier additive synthesis and live harmonic controls plus live waveform view. For timbre study. Free in your browser.
Analyzers & meters
Spectrum, waveform, loudness and level analysis — all measured live in your browser.
- Audio Oscilloscope — Live ViewerFree online oscilloscope showing live audio waveforms with time-base, gain, pause and L/R colors. Sine renders smooth, clipping flats. Runs in browser.
- Audio Spectrum Analyzer — FreeFree audio spectrum analyzer with log-frequency display, peak hold, L/R colors and spectrogram. Verify with the built-in 1 kHz tone. Runs in your browser.
- Dithering Demo — Noise ShapingHear dithering and noise shaping tame quantization distortion when reducing bit depth, with spectrum views. Interactive demo. Free in your browser, no download.
- Loudness Meter — Free LUFS ToolFree online loudness meter measuring Integrated LUFS, short-term and momentary loudness with K-weighting. For mixes and masters. Runs in your browser.
- Online Decibel Meter — Free ToolFree online decibel meter showing live dBFS levels with Fast/Slow ballistics and peak hold. Relative readings, not calibrated SPL. Runs in your browser.
- Tinnitus Frequency Test — Match PitchMatch your tinnitus pitch with sine tones and narrowband noise, per ear, with saved matches. Educational screening, not a diagnosis. Free in your browser.