01 · Tune
Tuner
The note in large type and a needle that responds instantly. A catalog of instruments and their tunings; pick the string or let the app detect it.
- Precision in cents
- Green within ±5 cents
- Guitar, bass, ukulele, violin and more
Tuner · Metronome · Analyzer
Sound, measured with precision.
One app to tune, practice in time and understand what you hear. Made for musicians who are starting out, rehearsing or making a living from it. Free, no account, no connection needed.
Android · iPhone · iPad · Apple Watch
Beating · 440 Hz reference
Out of tune
- Reference
- 440.00 Hz
- String
- Difference
- Beat
±5cents: the string turns green
30–300BPM on the metronome
8synthesized click sounds
6languages in the app
0servers listening to your audio
Three tools, one app.
What a musician opens twenty times a day, without extra menus. Each screen does one thing, with the precision of a studio tool.
02 · Keep time
Metronome
Simple and compound meters, subdivisions and accents. Setlists with sections to move between songs without stopping the rehearsal, with a pedal too.
- 30 to 300 BPM
- 8 sounds that won't blend into your instrument
- Keeps playing with the screen locked
03 · Understand
Analyzer
Real-time spectrum, harmonics of the note being played and sound level. In Music mode it detects the key and the chords, and tells you how certain it is.
- Spectrum and harmonics
- Level in dB SPL
- Key and chords, live
And on your wrist. Tuner and metronome on Apple Watch, working even when the iPhone stays at home. The beat is marked with vibration: in a loud rehearsal you feel it when you can no longer hear the speaker.
The science, no mystery.
Behind every screen there is real acoustics. These are the ideas the app relies on, explained step by step in our guides.
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The cent
The ear hears ratios, not hertz. That is why the tuner measures in cents: seven cents sound just as out of tune on the lowest string as on the highest.
1 semitone = 100 cents · 1 octave = 1200 cents What cents areBeating
Two close frequencies add up and the volume rises and falls. The speed of that pulse is their difference. When it disappears, the two notes match.
fbeat = |f₁ − f₂| How to tune a guitarHarmonics
A string does not vibrate at a single frequency, but at its fundamental and its multiples. Their balance is the timbre: why a guitar and a violin sound different on the same note.
f, 2f, 3f, 4f … All guidesThe beat
BPM means beats per minute. Practicing slowly and speeding up little by little, only once the passage is clean, is the fastest way to gain speed without getting sloppy.
60 BPM = 1 beat per second Metronome and BPMFor every stage.
The same app is there for your first chord and for your first time on stage.
If you're starting
Learn to hear what's in tune
At first it's hard to tell when a string is slightly flat. The needle shows you, and over time your ear learns to notice on its own.
If you play with others
Rehearse without losing the thread
Save songs with their tempo and sections, switch between them with a pedal, and know a song's key before you work it out.
If you do this for a living
A second opinion
Check harmonics or a boomy room on the spectrum, keep an eye on the level in dB SPL, and count odd meters the way they're counted.
Your audio never leaves your device.
- Microphone
- Processed in real time, never recorded and never sent to any server.
- Account
- There isn't one. No sign-up, no email, no password.
- Connection
- Not needed. It works in a rehearsal room without Wi-Fi and on a stage with no signal.
- Your data
- Your profile and your songs stay on your phone. Privacy policy
Free
Tune, practice and listen better.
Sound Tools is free. An optional one-time purchase removes the ads; the tools are the same in both versions.
Android 8 or later · iPhone, iPad and Apple Watch