Your guitar practice, in one place.

More time with
your guitar.

A guitar tuner, metronome, chord library and personal songbook. Four focused tools for your next practice session, right on your iPhone.

Works offline

No account needed

Your songs stay on your device

From the first string
to the last chorus.

Tune up, set your pace and keep the music you’re working on close at hand.

Guitar tuner

Choose a string, pluck it and follow the pitch guide. Standard six-string tuning keeps the essentials easy to find, from low E to high E.

Microphone tuning · Clear flat and sharp guidance

E₂A₂D₃G₃B₃E₄

Metronome

Slow a tricky passage down or build up the pace. Set a tempo from 40–240 BPM, or tap the beat you have in mind.

Tap tempo · 4/4 time · First-beat accent

Chord library

Look up common major, minor and seventh chords without leaving your practice. Clear diagrams show where your fingers go in standard guitar tuning.

Chord fingerings · Open and muted string labels

Personal songbook

Keep your own lyrics and chords together. Transpose the displayed chords and save capo preferences while your original song stays intact.

Create and edit songs on your phone, then export your library and restore it when you need it.

Local saving · Transpose and capo · Backup and restore

Your songbook starts with you. Add your own lyrics and chord charts; no commercial song catalog is included.

Practice offline, without an account. Microphone audio is processed on your device, and your songbook stays local unless you choose to export it.

OpenString for iPhone has been submitted to Apple and is awaiting review.