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Free online harp tuner
A tuner built for the lever harp: all 34 strings, three keys, right in your browser.
The Jam Jam harp tuner listens through your microphone and tells you, in real time, which note is sounding and how far sharp or flat you are, across all 34 strings of a lever harp, from the low C2 to the high A6. It knows the three keys a lever harp is actually tuned to: C major with every lever down, Eb major with three levers raised, and G major with one lever raised for the F. In-tune zone at ±5 cents, cents to the unit, frequency to a tenth of a hertz.
How to tune a lever harp
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Allow the microphone
Open the tuner, pick Harp and grant mic access: the audio is analysed on your device, nothing is uploaded.
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Pick your key
Choose C major, Eb major or G major depending on how your levers are set, then pluck a string.
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Work string by string, low to high
The tuner locks onto the nearest of the 34 strings and shows you the target note; turn the tuning key until the needle centres and turns green.
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Recheck after changing a lever
Flipping a lever shifts that string by a semitone: switch preset to match, and confirm the string is still centred.
A tuner that covers the whole harp
All 34 strings, C2 to A6
Most tuners only expect a handful of pitches. Jam Jam models the full range of a lever harp, string by string.
Three real keys, not one
C major, Eb major and G major match how a lever harp is actually played: raise the levers, switch the preset, keep tuning.
Reference note in a harp voice
Every string plays its target note with a real harp timbre, useful to check a string by ear before you even touch the tuning key.
Auto, manual or chromatic
It locks the nearest string by itself; one tap freezes a string, another returns to auto. Chromatic mode covers anything outside the three presets.
Why this harp tuner
- 34 strings modelled from C2 to A6
- Three presets: C major, Eb major (3 levers), G major (1 lever)
- 100% free, in your browser, no sign-up and no ads
- Everything is computed on your side: nothing is uploaded
A single-purpose tuner site stops the moment you are in tune. Here the tuner is one tab among others in the Jam Jam notebook: import a song, transpose it, export it to PDF. Offline in the mobile app.
Open the tuner →More Jam Jam tools
Harp tuner FAQ
Is this harp tuner free?
Completely: no account, no ads, nothing to install. It all runs in your browser, and the microphone audio is analysed on the spot. It is never sent to a server.
Which key should I pick for my lever harp?
Start from C major with every lever down. Raise the three levers that make Eb major, or the single lever that makes G major, and switch the tuner preset to match before you tune.
Does this work for a pedal harp?
The three presets follow lever-harp practice. A pedal harp uses the same underlying pitches for C, Eb and G major, so the tuner still helps, but its pedal-specific enharmonics are not modelled.