Precise Tuner

Pluck a string and see it at once — green when it's right.

iPhone version coming soon

Precise Tuner starts listening the moment you open it. Strings are guided one at a time, and for piano it measures your own instrument and guides you through all 88 keys. The tuner is free with no sign-up and no limits.

What it does

Guided tuning for 11 instruments

Guitar, bass, ukulele, violin, viola, cello, double bass, mandolin, banjo, wind instruments and piano, with 20 tunings such as Drop D, DADGAD and Open G. It tells you in words: "A little low, tighten".

Piano tuning fitted to your piano

Play 7 keys and the app learns your piano, then works out a stretch curve for all 88 keys and guides you key by key in the order technicians use.

Chromatic tuner with strobe

Any sound — singing, wind instruments, anything not on the list. Needle or strobe view, note, cents and Hz on one screen.

Reference pitch 415–466 Hz

442 for orchestras, 415 for baroque. The phone can also play the note you are tuning.

Unison helper and pitch raise

See the beats while you tune the 2–3 strings of one key, and pull a piano that has dropped a lot back up in one pass.

Tuning records as PDF

Before and after for every key, saved per instrument and shared as a PDF for the piano's owner or your next visit.

Questions

Is it free?

The tuner for every instrument is free with no limit. For piano you can measure, see the stretch curve and tune the first octave (A3–A4, 13 keys) for free. Pro adds all 88 keys, pitch raise, the unison helper, PDF records and no ads.

Why does a piano need a stretch curve?

Piano strings sound their overtones a little sharp, so octaves tuned to plain math sound flat. The app measures how sharp your piano is and stretches the targets to match.

Is my sound recorded?

No. The microphone is on only while a tuning screen is open, and sound is analysed on the phone — never recorded or sent anywhere.