Free audiophile & sound engineering tools
Twenty-three audiophile calculators and analyzers for the questions that come up between deciding you want better sound and actually getting it: whether an amp will drive a given headphone, what a room is doing to the bass, whether a file is really hi-res, whether you can hear a difference at all.
Everything runs in your browser. No download, no account, no upload, no tracking - audio files you load never leave your device.
Signal & files
Generate test tones, analyze a file, and check what your bits are really doing. (7 tools)
AnalyzerIs this file really hi-res? FLAC & Hi-Res Audio Checker
Drop a file or a whole album and see each file's frequency content as an FFT spectrum: where it stops, whether a sharp cutoff or a lossy source shows, and whether a 24-bit file is padded 16-bit audio.
GeneratorWhich test tone do you need? Online Tone Generator
Sine, square, triangle and sawtooth tones at any frequency or musical note, white, pink, brown, blue and violet noise, frequency sweeps, a channel test and a polarity check. Runs entirely in your browser.
TestAre my speakers or headphones wired right? Speaker & Headphone Test
Check that left and right come from the correct side, that a pair of speakers is in phase, how low the bass goes and how high the treble reaches, then sweep 20 Hz to 20 kHz for rattles.
TestHow low do my speakers or subwoofer really go? Bass & Subwoofer Test
Step a tone down from 200 Hz to 16 Hz, find the note where your bass fades out, set a subwoofer's phase by ear and sweep the bass for rattles and booms.
TestIs my microphone working, and is it set up right? Mic Test
Watch your microphone's level as you speak, then run a ten-second check for the noise floor, clipping, mains hum and how high its sound reaches, and play back what it recorded.
CalculatorDoes digital volume hurt quality? Bit Depth Calculator: Digital Volume Loss
Find out how many bits of audio resolution you lose when lowering digital volume in Windows or macOS. Shows effective bit depth and noise floor rise.
TunerIs my guitar, bass or ukulele in tune? Online Tuner
Tune a guitar, bass, ukulele, violin, viola or cello through your microphone: the string you played, how many cents off it is and which way to turn, or any note in chromatic mode, with A4 from 415 to 466 Hz.
Your ears & listening
Train your hearing, run blind tests, find your sound, and listen safely. (7 tools)
TestCan I actually hear the difference? ABX Blind Test
Eight built-in synthetic test pairs, no upload needed - or drag in two files of your own, DSD included, checked for what actually differs. Loudness-matched and sample-accurate, with a blind preference mode and a shareable certificate.
TrainingHow good are my ears, really? EQ Ear Training Game
Train your ears to identify frequencies from 20 Hz to 20 kHz, or only the range you can hear. Five training modes, score tracking, and a shareable Golden Ear Rating.
TestHow high can I hear, in each ear? Hearing Frequency Test
Find the highest tone you can hear in each ear and the lowest you hear through your headphones, with a slow sweep you stop when the tone fades out.
Listening testWhat sound do I actually like? Sound Signature Quiz
A blind A/B preference test over royalty-free music. Pick by ear between more or less bass, mids, treble, reverb, dynamics, even-harmonic warmth, and stereo width - then get your signature in plain English.
EQWhat does this EQ change sound like? Online Equalizer
A 10-band graphic EQ you can hear in real time over royalty-free music or your own file. Watch the response curve redraw live, then export presets for Equalizer APO, AutoEQ, Wavelet, or Poweramp.
MeterHow loud is it here? Decibel Meter
Measure the sound level around you in dB(A) with your phone or laptop microphone: Fast or Slow, the average, the maximum, octave bands and how long NIOSH allows at that level.
SafetyAm I listening too loud? Safe Headphone Volume Calculator
Enter your headphone sensitivity and volume setting to estimate the output SPL, the safe listening time at that level under the NIOSH 85 dBA / 8-hour limit, and today's dose so far.
Find your gear
Answer four quick questions for a ranked shortlist, then see it mapped against the whole scored catalogue. (1 tool)
FinderWhat should I buy? Help Me Choose: Audio Gear Finder Quiz
Answer four quick questions - category, budget, sound preference, use case - for a ranked shortlist pulled straight from our scored reviews. Then see every product mapped by price against score, your picks highlighted, every dot linking to its review.
Power & matching
Will it drive it? Size amplifier power, SPL, and headroom before you buy. (3 tools)
CalculatorWill my amp drive these headphones? Headphone Power Calculator
How much amplifier power your headphones need to hit a target listening level. Sensitivity (dB/mW or dB/V), impedance, headroom: required mW, RMS volts, and peak voltage swing.
CalculatorHow many watts do my speakers need? Speaker Wattage Calculator
How many watts your speakers need at the chair, from sensitivity, distance, room gain, and crest-factor headroom, by the inverse-square law.
CalculatorHow loud will it be at my chair? SPL Distance Calculator
The SPL at your listening distance from speaker sensitivity, amplifier wattage, and distance, with the inverse-square law and room gain.
Room & acoustics
Tame the room your gear plays in: modes, bass traps, and panel absorption. (3 tools)
VisualizerWhy does the bass sound wrong in my room? Room Mode Calculator
Map every standing wave resonance up to 300 Hz in rectangular, L-shaped, round, and arched-ceiling rooms. Canvas visualizer shows nodes and antinodes. Tells you where to sit and where to place bass traps.
CalculatorWhere should my speakers and my chair go? Speaker Placement Calculator
Enter the room and the layout and get the stereo triangle and toe-in, the bass dip each wall causes at your seat, the first reflection points to treat and the room modes where you sit.
CalculatorWill this acoustic panel actually work? Acoustic Panel Calculator
Plot the absorption coefficient of any porous acoustic panel from 20 Hz to 8 kHz. Thickness, flow resistivity, and air-gap depth into NRC, SAA, and a frequency curve. Presets for Owens Corning 703, Rockwool RW3, GIK 242, Auralex foam.
Cables
Gauge, resistance, and capacitance - what actually changes the sound. (2 tools)
CalculatorWhat gauge speaker cable do I need? Speaker Wire Gauge Calculator
Speaker cable resistance, system damping factor, and signal loss in dB for any gauge and length, and the minimum gauge for your run.
CalculatorIs my cable killing the treble? Cable Capacitance Calculator
The −3 dB treble roll-off a line-level run loses to cable capacitance, whether your phono cable stays inside a cartridge's recommended loading, and the load an MC step-up transformer reflects onto the cartridge.
Buying guides, ranked by score
Every pick is a product we reviewed, and a guide only goes up once there are enough qualifying reviews to fill it.
All 12 guides- Best Budget Headphones 4 scored picks Top pick: Sivga Anser 8.0
- Best Headphones Under $500 8 scored picks Top pick: HIFIMAN Sundara 9.0
- Best IEMs Headphones 7 scored picks Top pick: HIFIMAN RE2000 PRO Silver 8.8
- Best Open-Back Headphones 14 scored picks Top pick: HIFIMAN HE1000se 9.3
- Best Planar Magnetic Headphones 10 scored picks Top pick: HIFIMAN HE1000se 9.3
- Best Speakers 6 scored picks Top pick: Diora Acoustics Chors 5 8.5
- Best DACs 8 scored picks Top pick: Denafrips Enyo 15th Anniversary 9.1
- Best Headphone Amplifiers 4 scored picks Top pick: HIFIMAN Serenade 9.3
- Best Speaker Amps and Preamps 4 scored picks Top pick: Tonewinner AD-1PA+ 9.0
- Best Microphones 3 scored picks Top pick: Austrian Audio OC16 8.7
- Best Hi-Fi Accessories 13 scored picks Top pick: Synergistic Research PowerCell 14 9.2
- Best Reference-Grade Audio Gear All categories 10 scored picks Top pick: HIFIMAN HE1000se 9.3
Built on published models IEC 60268-7 Headphone power NIOSH 98-126 Safe listening Miki (1990) Acoustic panels RFC 9639 Hi-res checker
About these free audio tools
Are these audio tools really free?
Yes. Twenty-three calculators and analyzers, no account, no download, no payment. Every tool runs entirely in your browser using the Web Audio API and pure client-side computation. Your audio files (where uploaded) never leave your device.
Do I need to install anything to use the audio tools?
No. Every tool is a single web page. Modern browsers (Chrome, Edge, Firefox, Safari, Opera) on desktop and mobile run them out of the box. The tone generator, ABX test, FLAC checker, and EQ ear trainer all use the standard Web Audio API which is built into every browser. If you use one often, you can keep it as an app of its own: on the tool's page, press Install app when Chrome, Edge or Samsung Internet offers it, and on an iPhone or iPad tap the browser's Share button, then Add to Home Screen. The app opens straight into that tool. Every tool installs this way except Help Me Choose and the Sound Signature Quiz, whose answers are links into the reviews.
Are the audio tools accurate enough for real engineering work?
Yes for measurements that depend on math: power calculations, room mode prediction, cable resistance, capacitance roll-off, SPL falloff with distance. For listening-based tools (ABX, frequency training), accuracy depends on your headphones, output level, and listening environment. The tone generator outputs sample-accurate sine waves and noise via standard Web Audio nodes, but the browser and the operating system's mixer each add a volume stage before the converter, so it is not a calibration source for meters or audio interfaces.
Does the ABX blind test upload my audio files?
No. The ABX tool processes audio entirely in your browser. Files are decoded into AudioBuffers and never transmitted anywhere. Same for the FLAC & hi-res checker. The FFT analysis runs on your CPU, your files do not leave your device.
Which audio tool should I start with?
For matching gear: the headphone & speaker power calculator, then the ABX blind test if you are deciding between two pieces. For a new setup: the speaker and headphone test, which checks left and right, phase and how far the bass and treble reach. For room and setup: the room mode calculator and the SPL distance calculator. For training your ears: the EQ ear training game. For checking music files: the FLAC & hi-res audio checker.
Do the audio tools work on phones and tablets?
Yes. Every tool runs on iOS Safari, Android Chrome, and any modern mobile browser. The Web Audio API is standard everywhere now. The tone generator, ABX test, and ear trainer benefit from a connected DAC and quality headphones rather than phone speakers, but the calculators (power, room mode, cable, SPL, safe listening) work perfectly with the on-screen keyboard.
How accurate are the test-tone frequencies and signal levels?
Frequencies are sample-accurate. The Web Audio oscillator produces the exact Hz you set, down to the floating-point precision of the browser. Output level depends on your system volume, DAC, and amp gain, which the tool cannot read; for absolute SPL, calibrate once with a measurement microphone or use the safe-listening calculator to translate your volume position into dB SPL at the ear.
Do the tools remember my inputs between visits?
Yes. Every calculator saves your last-entered values in your browser's local storage, so a return visit starts where you left off. When values come back you see a "Restored your last inputs" notice with a "Reset to defaults" button. That way you always know the numbers on screen are yours, and one tap puts the defaults back. The ABX test, ear trainer, tone generator, and FLAC checker also keep their saved results and presets between visits. All of it stays on your device: no server, no account, no tracking. Clearing your browser storage clears it too.
Can I share a calculation result or test outcome with someone else?
Yes. The ABX blind test and the EQ ear training game both draw a certificate image you can download and post anywhere. Every calculator has a Share link button too: it copies a URL with your exact configuration in it, so whoever opens that link sees the page with your numbers already filled in. The tone generator shares a signal the same way, and the ABX test and hi-res checker can share a result link.