Strike a virtual fork and hear it ring down naturally - the metallic ping, then seven seconds of pure reference tone. A440 by default; C256, A432, the medical C128, or any pitch you type.
ready to strike
The fork workflow that trained generations of musicians: strike, match your reference string (or voice) to the ringing tone until the beating between them disappears, then tune everything else by intervals from that anchor. The skill it builds - hearing beats vanish - is the foundation of the tune-by-ear method. Want a sustained tone instead of a decaying one? The A440 page holds the note forever; want a needle instead of your ear, the chromatic tuner listens through your mic.
It reproduces what a physical fork does acoustically: press Strike and hear a pure tone that starts with a soft attack and decays away naturally over several seconds, exactly like a struck fork ringing down. The pitch is digitally exact - an A440 fork here is 440.000 Hz, which physical forks (affected by temperature and wear) only approximate.
A440 - the A above middle C at 440 Hz, the international concert pitch. Other traditions persist: C256 ("scientific pitch") in physics teaching, C128 forks in medical exams (the low, long-ringing fork used for vibration-sense and hearing tests), and A432 among alternative-tuning enthusiasts.
Two classic exams: the 128 Hz fork tests vibration sense on bones (neuropathy screening), and the 512 Hz fork runs the Rinne and Weber hearing tests, distinguishing conductive from sensorineural hearing loss by comparing air and bone conduction. The tone itself is the same physics as this page - the bone-conduction part needs the physical object.
They train different things. A fork gives one perfect reference and makes your ear do the matching - which builds the skill. A needle tuner does the judging for you - faster, no skill required. Best practice: tune the reference string to the fork by ear, tune the rest by intervals, and verify with the chromatic tuner if you want confirmation.
Generate single tones with precise frequency control. Perfect for quick audio testing and tuning.
Play multiple frequencies simultaneously with independent volume and panning controls.
Create linear or exponential frequency sweeps for speaker testing and room acoustics analysis.
Generate binaural beats for meditation, focus, and relaxation. Requires headphones for proper effect.
Generate telephone dial pad tones (Dual Tone Multi Frequency). Interactive touch-tone dial pad.
Professional metronome with tap tempo, time signatures, subdivisions, and tempo trainer for musicians.
Tap along to any song to find its tempo in beats per minute. Includes tempo markings reference.
Hear major, minor, diminished, and seventh chords in every key. Block chords or arpeggios.
Hear classic progressions like I-V-vi-IV and 12-bar blues in any key at any tempo.
Free browser piano with 3 octaves, note names, and computer keyboard support.
Generate white, pink, and brown noise for sleep, focus, tinnitus relief, and speaker burn-in.
Reference tuning notes for guitar, bass, ukulele, violin, cello, and more at concert pitch (A440).
Test your subwoofer with a 60-second frequency sweep (150Hz-1Hz) and individual bass test tones.
Test your hearing range from 8kHz to 20kHz. Find your hearing age and compare with averages.
Ancient healing tones including 528Hz (DNA repair). For meditation, chakra activation, and spiritual healing.
Test stereo balance with panning control and left/right channel testing. Perfect for speaker setup.
Check speaker wiring polarity by comparing in-phase and out-of-phase test signals.
Measure your Bluetooth or system audio delay in milliseconds with a click-and-flash sync test.
Real-time frequency analysis of your microphone input with a live log-frequency display.
Measure approximate sound levels with your microphone - live dB with min/avg/max tracking.
Check your microphone in seconds: live waveform, level meter, and record-and-playback check.
Learn to recognize musical intervals by ear with quiz mode, score tracking, and song mnemonics.
Chromatic pitch pipe with all 12 notes across 3 octaves. Perfect for singers, choirs, and a cappella groups.
Experience the auditory illusion of an infinitely ascending or descending tone. Mind-bending psychoacoustic phenomenon.
Can you hear the mosquito tone? High-frequency test (15-20kHz) that only young people can hear. Find your hearing age!
Create relaxing ambient soundscapes with singing bowls, nature sounds, and binaural beats.
Three sound modes to clean a muffled speaker: 165 Hz water eject, dust-shaking sweeps, and vibration.
Push water out of a wet phone or watch speaker with a pulsed 165 Hz tone - the same method Apple Watch uses.
Adjustable high-frequency whistle (8-22 kHz) for dog training - clearly audible to dogs, silent to most adults.
Rhythmic pulsed tones across delta to gamma ranges. Stronger than binaural beats and works without headphones.
Name 12 random notes with no reference tone and find out if you have absolute pitch or great pitch memory.
Sing your lowest and highest notes and get your range plus voice type - bass to soprano. Mic-based, nothing uploaded.
Find the highest frequency you can hear (8-20 kHz) and see how old your ears test. Takes one minute.
Instant karaoke via center-channel cancellation - free, unlimited, and processed locally.
Record from your microphone and download as WAV - no signup, nothing uploaded.
Normalize any file to a LUFS target with true-peak protection instead of silent clipping.
16-step beat maker with synthesized 808-style drums, swing, and shareable pattern links.
Drop a file and get integrated LUFS, true peak, RMS, and a waveform - measured locally, nothing uploaded.
Microphone tuner with a cents needle - play any note on any instrument and tune to ±5 cents.
Five-minute headphone checkup: channels, wiring polarity, bass and treble reach, and driver distortion.
Send noise to each 5.1 channel - fronts, center, surrounds, and subwoofer - and catch swapped or dead speakers.