Comparison
Open—Shape vs. the other tuning & chord apps
If you mainly need to get in tune fast and browse standard chord charts, GuitarTuna or Fender Tune will do that well — they're built around exactly that. If you're spending real time in alternate tunings and need to know what a chord actually looks like once you've retuned, that's the problem Open—Shape is built to solve. Here's the honest breakdown, dimension by dimension.
| Open—Shape | GuitarTuna | Alt Tunings / ChordBank | ChordKit | Fender Tune | |
|---|---|---|---|---|---|
| Pricing model | Free, or $9.99 one-time for Pro | Subscription only (multiple tiers) | Subscription, $4.49–$14.99/mo | Free, $4.99 one-time IAP | Free |
| Install required | No — runs in your browser | Yes | Yes | Yes | Yes |
| Built-in tunings | 33, free | Alt tunings gated behind subscription | 100+ (subscriber claim) | A handful of common ones (e.g. Drop D, E♭) | Not a focus — built around Standard |
| Custom tuning support | Unlimited (Pro) | Limited, subscription-gated | Yes | Not offered | Not offered |
| Audio | Real recorded acoustic samples | Not publicly specified | Not publicly specified | Not publicly specified | Not publicly specified |
| Song-specific chord library | Real songs remixed into alt tunings, every voicing verified against the engine | 20,000+ songs, standard chord charts & tabs | Not a feature | Not a feature | Not a feature |
| Progression builder | Yes — build, save & share | No (chord games instead) | No | Yes — a song-composition tab | No |
| Mic tuner | Yes | Yes | Yes | Yes | Yes |
| Platforms | Web today; iOS & Android in progress | iOS, Android | iOS | iOS | iOS, Android |
GuitarTuna
The default tuner for a lot of guitarists — huge install base, a deep tab library, and gamified practice tools that make it genuinely good for beginners tuning up and learning first chords. Alternate tunings and its fuller chord library sit behind a recurring subscription, and it's organized around a fixed chord library rather than a voicing search engine, so it doesn't retarget the way Open—Shape does when you change tunings.
Alt Tunings / ChordBank
The closest feature overlap of the four — a real tuning-aware voicing tool with 100+ built-in tunings and its own custom-tuning support. The difference is mostly the business model: it's a recurring subscription rather than a one-time unlock, and it doesn't have a song-specific library of real progressions verified against its own engine.
ChordKit
Closest to Open—Shape on price — free with a small one-time unlock — and it has its own song-composition tool, which is a real, comparable feature. Its alternate-tuning support is limited to a handful of common ones rather than a full voicing search across a large tuning library, and it's iOS-only.
Fender Tune
A strong, free, tuner-first app with an enormous chord-diagram library (5,000+) for reference. It isn't built around alternate tunings or voicing search at all — it's a reference library organized around Standard tuning, which makes it a different kind of tool than a shape-finder.
See it instead of taking our word for it
Every claim on this page about Open—Shape's own features is provable in the app itself — including the song library, which is real songs re-voiced in real alternate tunings, verified against the same engine you'd use yourself.
Questions
Is there a free alternative to GuitarTuna?
Yes. Open—Shape's free tier includes the full chord-voicing engine, all 33 built-in tunings, the mic tuner, and up to 3 saved progressions, with no subscription. GuitarTuna's free tier covers tuning and basic first-position chords; its alternate tunings and deeper chord library sit behind a recurring subscription.
What's the difference between a tuner app and a chord voicing app?
A tuner app tells you if a string is in pitch. A chord voicing app searches the fretboard for every playable way to shape a given chord in whatever tuning you're using — the harder problem once you're off Standard tuning, where familiar chord shapes no longer apply. Most tuner apps, including GuitarTuna and Fender Tune, are built around a fixed chord library rather than a voicing search engine.
Does Open—Shape use real guitar sounds or synthesized tones?
Real recorded acoustic guitar samples, not a synthesizer — every chord you preview is built from actual string recordings.
Competitor pricing and features verified against each app's own public pages and App Store listings at time of writing and may change — check their current listing before deciding. Open—Shape does not currently have an App Store or Google Play listing; the app runs in your browser today.