Audio Guides & Tools
Free interactive tools to test your speakers, headphones, and hearing — plus guides on sound science, music theory, and hearing health.
Quick Start
Hearing Test
Free online hearing test. Measure your upper frequency limit, detect high-frequency hearing loss, and estimate your hearing age.
Speaker Test
Test your speakers and headphones for free. Check Left/Right stereo balance, polarity/phase, and frequency response with our online audio tools.
Mic Test
Test your microphone online instantly. Check volume levels, identify background noise, and fix mic permissions. Secure, private, and works in your browser.
Audio Testing
Test your speakers, headphones, and microphone to ensure optimal audio quality.
Hearing Test
Free online hearing test. Measure your upper frequency limit, detect high-frequency hearing loss, and estimate your hearing age.
Speaker Test
Test your speakers and headphones for free. Check Left/Right stereo balance, polarity/phase, and frequency response with our online audio tools.
Subwoofer Test
Test your subwoofer's low-end response. Free online bass sweep (20-200Hz). Detect rattles, check crossover frequencies, and verify deep bass performance.
Headphone Test
Test your headphones or speakers online. Verify Left/Right stereo channels, check bass response, and identify rattling or distortion. Free audio test suite.
Mic Test
Test your microphone online instantly. Check volume levels, identify background noise, and fix mic permissions. Secure, private, and works in your browser.
Frequency Sweep
Generate a full audio frequency sweep from 20 Hz to 20 kHz. Test speakers, headphones, and hearing range with a logarithmic sine wave sweep.
Sound Test
Test your audio equipment instantly. Check stereo balance, frequency response, bass capability, and phase alignment for speakers and headphones.
Instrument Tuners
Free online chromatic tuners for guitar, bass, ukulele, violin, and more string instruments.
Chromatic Tuner
Tune any instrument with our free online chromatic tuner. Uses your microphone for real-time pitch detection. Accurate for guitar, violin, ukulele, and voice.
Guitar Tuner
Free online guitar tuner using your microphone. Supports Standard EADGBE, Drop D, Half Step Down, and Open G tunings. Works on mobile.
Bass Tuner
Tune your bass guitar accurately with our free online tuner. Supports Standard 4-String (EADG), 5-String (BEADG), and Drop D. Low frequency optimized.
Ukulele Tuner
Tune your ukulele instantly with our free online tuner. Supports standard Soprano/Concert/Tenor (GCEA), Low G, and Baritone (DGBE) tunings.
Violin Tuner
Tune your violin instantly with our free online tuner. Supports standard GDAE tuning with precise pitch detection for students and professionals.
Mandolin Tuner
Tune your mandolin instantly with our free online tuner. Supports standard GDAE tuning for all 8 strings. Microphone-based pitch detection.
Banjo Tuner
Tune your 5-string banjo instantly with our free online tuner. Optimized for standard Open G tuning (gDGBD) with microphone detection.
Tone Generators
Generate precise audio frequencies, noise colors, and specialized sound patterns.
White Noise
Generate white, pink, or brown noise to block distractions, improve sleep, and mask tinnitus. Free online tool with volume control. No app required.
Binaural Beats
Generate custom binaural beats for deep sleep (Delta), meditation (Theta), focus (Alpha), and peak performance (Gamma). Free online tool. Headphones required.
Tap Tempo BPM
Find the BPM of any song instantly. Tap along to the beat to calculate the exact tempo. Ideal for DJs, producers, and musicians.
Metronome
Free online metronome with adjustable tempo (20-300 BPM), tap tempo, and time signatures. Works on mobile and desktop.
Shepard Tone
Experience the auditory equivalent of a barber pole. Our free Shepard Tone generator creates a sound that rises forever but never gets higher.
DTMF Tones
Generate DTMF phone dial tones instantly. Use our interactive keypad to create dual-tone multi-frequency signals for testing phone systems.
Relaxation & Focus
Ambient sounds and noise generators for sleep, relaxation, focus, and productivity.
Sleep Sounds
Create your perfect sleep environment. Mix White Noise, Rain, Ocean Waves, and Wind. Free online ambient sound mixer with sleep timer.
Brown Noise
Can Brown Noise help with ADHD? Use our free generator to find out. Learn the science behind why this deep, rumbly noise helps silence the 'busy brain'.
Rain Sounds
Free Rain Sounds Generator. Loop realistic rain, drizzle, and thunderstorms. A perfect natural pink noise alternative for sleeping, studying, and relaxing.
Focus Sounds
Create your perfect focus environment. Mix ambient sounds like rain, brown noise, and coffee shop vibes to block distractions and enter deep work mode.
Hearing Health
Protect your hearing and understand safe listening levels with our health guides.
Hearing Damage
Safe decibel level chart with OSHA and NIOSH exposure limits. Learn how to calculate safe listening times and prevent hearing loss.
Tinnitus Test
Identify the pitch of your tinnitus with our free frequency matching tool. Useful for masking therapy and communicating with audiologists.
Vocal Range
Free online vocal range test. Find your highest and lowest notes. Determine if you are a Soprano, Alto, Tenor, or Bass in under 2 minutes.
Music Theory
Learn music theory fundamentals including intervals, scales, and ear training exercises.
Hz to Note
Convert any audio frequency (Hz) to its corresponding musical note. Find the perfect pitch, see cents deviation, and play the reference tone. Free online tool.
Interval Training
Train your ear to recognize musical intervals. Interactive quiz for musicians to master relative pitch, from minor seconds to perfect octaves.
Perfect Pitch
Take our free Perfect Pitch test. Listen to random notes and identify them without a reference. Learn the difference between absolute and relative pitch.
Piano Frequencies
Interactive piano frequency chart. See the exact Hz value for all 88 keys, from A0 to C8. Learn about concert pitch (A440) and tuning formulas.
Circle of Fifths
Master the Circle of Fifths with our interactive tool. Learn key signatures, chord progressions, relative minors, and how to use the circle for songwriting.
Healing Frequencies
Explore solfeggio frequencies, chakra tones, and other therapeutic sound frequencies.
432 vs 440 Hz
Compare 432 Hz and 440 Hz tuning side-by-side. Understand the science, the history of concert pitch, and why some believe 432 Hz is superior for healing.
Solfeggio Tones
Listen to all 9 Solfeggio Frequencies (174 Hz - 963 Hz). Free player and guide to the 'Healing Frequencies,' including the Miracle Tone (528 Hz).
40 Hz Gamma
Generate 40 Hz gamma binaural beats for focus, memory, and cognitive performance. Explore the science behind 40 Hz therapy and its potential for brain health.
7.83 Hz Schumann
Listen to 7.83 Hz Schumann Resonance via binaural beats. Explore Earth's electromagnetic frequency and its grounding effects.
Chakra Tones
Listen to the 7 Chakra Frequencies. Free Solfeggio tone generator for Root, Sacral, Solar Plexus, Heart, Throat, Third Eye, and Crown chakras.
Audio Reference
Reference charts and calculators for decibels, frequencies, and audio specifications.
Decibel Chart
How loud is too loud? Complete decibel (dB) chart with real-world examples. Learn safe exposure limits, understand dBA vs dB, and protect your hearing.
Sound Frequencies Explained
Master the audio spectrum. Learn about audible ranges, musical notes, binaural beats, and the science of Hz in this comprehensive guide.
Hearing Health Guide
Protect your most valuable tool: your ears. Learn about noise-induced hearing loss, safe volume levels, tinnitus management, and how to test your hearing.
Instrument Tuning Guide
Master guide to tuning any instrument. Learn standard pitches, alternate tunings, and troubleshooting for Guitar, Bass, Violin, Ukulele, and more.
Frequency Chart
Explore the audio frequency spectrum from 20 Hz to 20 kHz. Understand bass, mids, and treble frequencies with our interactive chart and audio examples.
Noise Colors
Free noise color generator for sleep and focus. Compare White, Pink, and Brown noise. Learn which frequency spectrum is best for ADHD, tinnitus, and relaxation.
Ultrasonic
Can you hear the 'Mosquito' tone? Test your high-frequency hearing with our ultrasonic generator. Discover your 'hearing age' and learn about presbycusis.
Hz ↔ Wavelength
Convert frequency (Hz) to wavelength (λ) instantly. Calculate wave speed, period, and length for sound waves, radio waves, and light.
Piano Metronome
Free online piano metronome with adjustable tempo for scales, arpeggios, and sight-reading. Includes BPM guides for classical pieces.
Guitar Metronome
Free online guitar metronome for strumming patterns, fingerpicking, and building speed. Includes BPM guides for popular songs.
Drum Metronome
Free online drum metronome. Build speed, develop time feel, and master odd meters. Includes BPM guides for rudiments and grooves.
Time Signatures Explained
Learn how time signatures work and how to practice them with a metronome. Covers 4/4, 3/4, 6/8, 5/4, 7/8, and odd meters with audio examples and practice tips.
Free Viola Tuner Online (Microphone)
Tune your viola online with our free microphone-based tuner. Standard C-G-D-A tuning with precise frequency reference. Works on mobile and desktop. No app required.
Free Cello Tuner Online (Microphone)
Tune your cello online with our free microphone-based tuner. Standard C-G-D-A tuning optimized for low frequencies. Works on mobile and desktop. No app required.
Free Tenor Guitar Tuner Online
Tune your tenor guitar online with our free microphone tuner. Supports standard CGDA, GDAE Irish, and Chicago tuning. Works on mobile and desktop. No app required.
Free Charango Tuner Online
Tune your charango online with our free microphone tuner. Supports standard G-C-E-A-E tuning for Andean music. Works on mobile and desktop. No app download required.
Multiple Tone Generator
Generate and play multiple frequencies simultaneously. Free online multi-tone generator for testing harmonics, beating frequencies, chords, and speaker response.
Pitch Shifter
Shift the pitch of any audio file up or down by semitones. Free online pitch shifter for musicians, producers, and learners. Upload MP3, WAV, or other audio formats.
Voice Recording Tips
Learn professional voice recording techniques. Get crystal-clear recordings with proper mic placement, room acoustics, and audio settings for podcasts, voiceovers, and memos.
Time Stretcher
Change the tempo and speed of any audio file from 25% to 200%. Free online time stretcher for musicians, students, and podcast listeners. Works with MP3, WAV, and more.
Free Online Voice Memo Recorder | Audio Notes App
Record voice memos online for free. Capture audio notes, ideas, and reminders instantly in your browser. No app download required, works on any device.
How to Record a Podcast
Learn how to record a podcast with professional audio quality. Essential equipment, software setup, recording techniques, and tips for solo and remote interviews.
How to Record an Interview
Learn how to record interviews with professional audio quality. Equipment setup, interview techniques, legal considerations, and tips for in-person and remote recordings.
Have Questions?
Check out our frequently asked questions about sound measurement, hearing, and audio.
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