A chord & tuning companion for guitarists
Every chord,
in any tuning.
Open—Shape maps real, playable voicings across the whole fretboard — in Standard, DADGAD, Open G, or a tuning you invented five minutes ago. Hear every shape on real acoustic strings.
Free in your browser · nothing to install · no account
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.
Get Open—Shape
Your pocket is next
Open—Shape is headed to the App Store and Google Play. Until then, the full app lives in your browser — phone or desktop.
App Store Coming soon to
Google Play
or right now
Open it in your browser