Free · in your phone's browser · nothing uploaded
Free music tools, one job each.
Free online music tools, each for one question: is my guitar in tune, what tempo is this, which note am I singing, how high can I go, which chords fit. More than a hundred of them run in your phone's browser, with nothing to install and no account. They started as parts of Brumm, the app that turns your humming into a track. The app needed an ear that hears which note you sing, a tuner, a metronome. Each part turned out useful on its own, so here they are, free.
Daniel built Brumm because making music is the fun part, not the finished file. A generator can give you a polished song in a minute, but it gives you the average of everything it has heard. Your odd little idea, the melody nobody would expect, is the part that’s yours. Brumm keeps it and makes it sound like a track. Human-made, AI-assisted: Daniel wrote the prompts and listened to every sound; a swarm of agents wrote the code.
I’m Mika, the husky who lives with him in Neukölln. I listen with one ear. I tell you which note you sang, how many cents off, how fast you clap. I never tell you whether your voice is good, and I keep nothing you sing: it stays on your phone. When you’re done measuring, hum something into the app and hear it become a track. Kids have their own games. Who we are: Daniel, Mika.
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Music tools list: which tool for which job
The ones people need most come first: practice tools (tuner, metronome), then singing, ear training and music theory (keys, chords, transposing), then production. Each tool has its own page. The ones that listen ask for the microphone when you tap, not before.
| You want to | Tool | What you get |
|---|---|---|
| Tune a guitar, ukulele, violin or bass | Tuner: guitar, ukulele, violin, bass and dozens more | The note and how many cents off, string by string; tap a string to hear it |
| Keep time while you practise | Metronome | 20 to 300 BPM, 1 to 12 beats a bar, eighths, triplets or sixteenths |
| Find the tempo of a song | BPM counter, tap tempo | The BPM of music the phone hears or of a file, or from your taps |
| Know which note you sing or play | What note am I singing?, What note is this?, pitch detector | The note, its octave, the hertz and the cents |
| Find your vocal range | Vocal range test, voice type test | Lowest and highest comfortable note, and the voice type |
| Warm up before you sing | Vocal warm-up | 5, 10 or 15 minutes, sung along in your range |
| Check whether you sing in tune | Can I sing in tune? | Five notes played and sung back, the cents on each |
| Train your ear | Intervals, major or minor, perfect pitch, rhythm | Short rounds of tones made on your phone |
| Look up a key's scale and chords | C major, A minor and the other 22 keys | The notes, seven chords, the Camelot number, a loop |
| Move chords to another key | Transpose chords | The same chords in the new key, played first |
| Find chords for a melody | Chords for my melody, singing key finder | Hum a line: its key, and three sets of chords that fit |
| Turn a hum into MIDI | Hum to MIDI | A MIDI file and WAVs, zipped |
| Tune an 808 or find a sample's root | 808 tuner, root note of a sample | The note and cents, a retuned WAV |
| Play a tone at an exact frequency | Tone generator, note frequency chart | Any frequency from 20 Hz to 20 kHz; every note from C0 to B8 in hertz |
| Play a music game | Pitch matching, higher or lower; for children, the kids' games | A round or a streak, nothing to sign up for |
| Make a track from a hum (a music maker, no DAW) | The app | Your melody over drums, bass and chords |
Not here: a virtual piano, a drum machine or step beat maker, a looper, stem separation, a circle of fifths, staff paper. For chord names, the key pages list each key's seven chords; scales cover major and minor only.
Music production tools, Pro Tools and AI
For producers there are the producer tools: hum to MIDI, a vocal chop maker, the 808 tuner with the steps for Ableton Live, FL Studio and Logic Pro, the tempo of 20 genres from house to trap, every key with its Camelot number, and tools for DJs. They end in a number, a MIDI file or a WAV, and you take it from there.
Pro Tools, which most people mean when they type "pro tools music", is Avid's DAW for recording, editing and mixing. It is a different thing; a MIDI file or WAV from here opens in it as in any other DAW.
Free music editing tools
For cutting, fading and cleaning up audio: Audacity, a free audio editor for Windows, macOS and Linux. For recording and arranging whole songs: GarageBand (free on Apple devices), and in the browser BandLab and Audiotool (free DAWs, as of 2026). There is no audio editor or DAW here; a MIDI file or WAV from these tools opens in any of them.
Most AI music tools generate: a prompt goes in, a finished song comes out. None of these tools does that. They measure and convert what you sing or play, with signal processing, so the note you get is the note you sang. The app reads a whole melody the same way, then plays your notes with sampled instruments over drums, bass and chords: the melody stays the one you hummed.
What are the tools used in music?
First, the instruments. Since Erich von Hornbostel and Curt Sachs (1914), musicologists sort them by what vibrates:
- Chordophones, a stretched string: guitar, violin, harp, piano.
- Aerophones, a column of air or a reed: flute, trumpet, saxophone, pipe organ, harmonica.
- Membranophones, a stretched skin: most drums.
- Idiophones, the body itself: cymbals, xylophone, kalimba, a wine glass.
- Electrophones, added by Sachs in 1940: synthesizers, drum machines, the 808.
Then the tools around the instruments. To tune, musicians used the tuning fork (John Shore, 1711); today a tuner reads the pitch from a microphone. To keep time, the metronome (Maelzel's patent, 1815); today a click on the phone. To learn, scales, chords and ear training. To record and produce, a microphone, an audio interface, a DAW (the program that records, edits and mixes), MIDI, samples and plug-ins. This page has tools for the first three and for the small jobs of the fourth. It has no DAW.
The 7 elements of music, and a tool for each
Textbooks count them differently. A common list of seven, with what each is in physical terms:
| Element | What it is | Where to work on it |
|---|---|---|
| Melody | Pitches one after another. A pitch is what you hear from how many times a second the air vibrates (its frequency, in hertz): A4 is 440 Hz. | note tools, singing tests |
| Harmony | Notes at the same time. The intervals that sound smooth have simple frequency ratios: a fifth is 3:2 (equal temperament makes it 1.4983, two cents narrower) | major or minor, chords for my melody, the key pages |
| Rhythm | When the notes start and how long they last; the tempo in beats per minute | metronome, tap tempo, rhythm test |
| Dynamics | Loudness. About 10 dB more sounds roughly twice as loud at ordinary listening levels (S. S. Stevens' sone scale, 1950s) | No tool here: a phone's microphone is not a calibrated sound level meter |
| Timbre | Tone colour: which overtones sit above the fundamental, how strong they are, and how the sound starts and dies away. A sine has no overtones, which is why it sounds plain | tone generator (sine, triangle, square, saw), hum to bell |
| Texture | How many parts sound at once and how they layer | the app: your hum over drums, bass and chords |
| Form | How sections repeat and change: verse, chorus, the drop | the app |
How a browser tool hears a note
A microphone turns air pressure into numbers, tens of thousands a second. A pitch reader looks for the time after which that wave repeats, its period. The tools here that listen to a voice or a string mostly use the YIN method (de Cheveigné and Kawahara, 2002) on slices of 40 milliseconds. The low E of a guitar, E2 at 82.4 Hz, repeats every 12.1 ms, so one slice holds three periods of it. The frequency becomes a note by counting semitones from A4 = 440 Hz: n = 12 × log2(f / 440). A cent is a hundredth of a semitone: 0.25 Hz at A4, 0.05 Hz at E2.
Where it goes wrong, and what the tools do about it:
- Octaves. A sound whose second harmonic is stronger than its fundamental can read an octave off, and a phone keeps little of a low note's fundamental. The pitch detector checks the octave a second time. In its benchmark (2026-10-28), 65 generated tones from B0 to C7: the reader alone named 16 an octave off, with the check none. Through a simulated phone microphone that drops everything below about 150 Hz, one of the 65 still came out an octave off.
- Chords. These tools read one note at a time. Strum a chord and you get one of its notes or none, so tune string by string.
- Noise. A fan, traffic or a second voice blurs the period. A hiss has no period at all, so it has no note; What note is this? says so.
- Quiet phones. Many Android phones record far quieter than an iPhone. The tools lift a quiet recording before they read it.
Tempo works differently. The BPM counter measures every 10 ms how much louder the sound just got, then finds the delay at which that pattern repeats best (autocorrelation). It shows a number only once four beats agree. All of this runs on your phone; the sound is not sent anywhere.
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