A chord & tuning companion for guitarists
Every chord,
in any tuning.
A free chord progression builder and chord finder for guitar. Open—Shape maps real, playable voicings across the whole fretboard — in Standard, DADGAD, Open G, or a tuning you invented five minutes ago — then lets you wire them into a progression and hear it on real acoustic strings.
Free in your browser · nothing to install · no account · see what's inside
Explore
The whole fretboard,
open to you
Five quiet tools that work as one — so you spend less time searching and more time playing.
Chord engine
Every voicing, in every tuning
Search the full fretboard for a chord in any built-in alternate tuning — or one you've named yourself. Filter results down to a specific note count, browse every voicing the engine finds, and preview each one instantly.
Each shape comes labeled with what your hands actually need to know: how hard it is, whether the thumb reaches over, whether the fifth drops out.
Tunings
33 tunings built in. Yours, too.
From Drop D and DADGAD to Open C Minor, New Standard, and the American Football tuning — they're all a tap away, and the whole engine retargets the moment you switch.
When the built-ins aren't enough, name a tuning of your own and Open—Shape treats it like it's always been there.
Sound
Hear it before you fret it
Every voicing plays back on recordings of a real acoustic guitar — not synthesized tones. Tap a chord and hear exactly what those strings, at those frets, sound like together.
It's the difference between reading a shape and knowing you want it.
Progressions
Sketch the song while it's still warm
Chain voicings into a progression, drag to reorder, and tap through to hear how the changes move. Undo, redo, rearrange — it stays out of your way.
Save the ones worth keeping and come back to them in any tuning.
Tuner
A tuner that knows where you're headed
The built-in mic tuner listens, works out which string you're on, and tracks it — steady through vibrato, decay, and room noise.
It even follows along while you're still building a custom tuning, targeting the notes you've drafted so far.
Pricing
Free to wander.
Pro when you settle in.
Everything you need to start finding shapes.
- The full chord engine, every voicing
- All 33 built-in tunings
- Real acoustic playback
- The mic tuner
- Up to 3 saved progressions
For players who never stopped retuning.
- Everything in Free
- Unlimited custom tunings
- Unlimited saved progressions
One-time purchase, no subscription — the free tier is free for good.
New · Open—Shape Canvas
Two apps, one Open—Shape
The app finds you a shape. The canvas is where you build with them — chords on an open board, wired into a progression, with a tuning and a capo feeding the whole chain.
Change the tuning once and every shape below it rewrites itself. Your tunings and saved progressions carry across both.
Open the canvas →
Get Open—Shape
Your pocket is next
Open—Shape is on the App Store now, with Google Play to come. The full app also lives in your browser — phone or desktop.
App Store Coming soon to
Google Play
or right now
Open it in your browser