The top of the spectrum: pure sine tones from 5 kHz to 22 kHz with presets at the landmarks - tweeter checks, hearing-limit exploration, and the frequencies most adults can no longer hear. Keep the volume moderate; up here you cannot always judge loudness by ear.
Volume warning: if you cannot hear a tone you cannot judge its level - keep system volume moderate for the sake of tweeters, young ears, and pets in the room.
8 kHz is sibilance and cymbal sizzle - nearly everyone hears it. 15 kHz marks the age line (the old CRT television whine - full story on the 15 kHz page). 17.4 kHz is the famous Mosquito deterrent frequency, mostly under-25 territory - explored on the mosquito tone and 17 kHz pages. Find your personal ceiling with the hearing age test, and for dog training frequencies the dog whistle adds the right presets.
Tweeter and driver testing (a healthy tweeter renders a clean sine smoothly, damage adds crackle), hearing-ceiling checks, pest and pet experiments, finding hardware limits (many speakers and Bluetooth codecs roll off before 20 kHz), and demonstrating age-related hearing differences.
Either you crossed your hearing ceiling - which drops with age from about 20 kHz in childhood to 12-15 kHz in middle age - or your equipment quit first: many speakers, earbuds, and low-bitrate Bluetooth connections stop reproducing before your ears stop hearing. Test with wired quality headphones to separate the two.
Loud sound at any frequency damages hearing, and high frequencies are sneaky: if the tone is above your ceiling you cannot gauge how loud it is. Keep volume moderate always; the tone is present at full energy whether or not you perceive it.
Barely. Consumer speakers roll off steeply above 20 kHz - within the range this tool covers (up to 22 kHz) you get real output on decent hardware, but true ultrasound beyond that is out of reach for browsers and consumer speakers alike.
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.