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Open—Shape Review

Open—Shape is a freemium chord progression builder and chord finder for guitarists, mapping playable voicings across the fretboard in various tunings with real acoustic sounds.

shipped Sep 16, 2026freemium
Domain rating18
Open—Shape — product screenshot

Why it matters

1Offers a free tier with full chord engine, 33 built-in tunings, and up to 3 saved progressions.
2Features a Pro version available for a one-time payment of $9.99.
3Includes a built-in mic tuner that supports custom guitar tunings.
4Provides real acoustic playback for all chord voicings.

About Open—Shape

Business Model
Freemium SaaS
Platforms
Web, iOS
Target Audience
Guitarists

Pricing Plans

Free
$0
  • Full chord engine, every voicing
  • All 33 built-in tunings
  • Real acoustic playback
  • Mic tuner
Pro
$9.99 one-time
  • Everything in Free
  • Unlimited custom tunings
  • Unlimited saved progressions

overview

What is Open—Shape?

Open—Shape is an AI-powered guitar tool developed by Open—Shape that enables guitarists to build chord progressions and find playable voicings across the fretboard. It supports a wide array of tunings, including custom configurations, and provides real acoustic playback for all chords. The platform also integrates a mic tuner capable of adapting to custom tunings.

features

Key Features of Open—Shape

Open—Shape provides a comprehensive suite of tools for guitarists, focusing on chord exploration and progression building. Its core functionality revolves around an advanced chord engine and robust tuning support.

  • Chord engine with all voicings mapped across the entire fretboard.
  • Real acoustic playback for every chord voicing.
  • Support for 33 built-in tunings and unlimited custom tunings in the Pro version.
  • Chord progression builder, allowing users to wire chords into sequences on an open canvas.
  • Built-in mic tuner that identifies string pitch and tracks custom tunings.
  • Ability to save and play back chord progressions.
  • Visual representation of chord shapes for various tunings.

use cases

Who Should Use Open—Shape?

Open—Shape is designed for guitarists seeking to explore new sounds, experiment with tunings, and streamline their songwriting process. It caters to both beginners and experienced players interested in advanced harmonic exploration.

  • Guitar players looking to build and wire chord progressions.
  • Musicians interested in alternate guitar tunings, including DADGAD, Open G, and custom configurations.
  • Players who frequently retune their guitars and need a versatile tuner.
  • Songwriters and arrangers seeking to visualize and audition chord voicings in different tunings.
  • Individuals exploring and learning about various guitar tunings and their common chord shapes.

how to use

How to Use Open—Shape

To begin using Open—Shape, users can access the web application or download the iOS app. The platform provides an intuitive interface for selecting tunings, finding chords, and constructing progressions.

  • 1Navigate to openshape.app or download the iOS application.
  • 2Select a desired guitar tuning from the 33 built-in options or create a custom tuning.
  • 3Utilize the chord finder to map playable voicings across the fretboard for the chosen tuning.
  • 4Add selected chords to the Canvas to build a progression.
  • 5Use the real acoustic playback feature to audition individual chords or entire progressions.
  • 6Employ the built-in mic tuner to accurately tune a guitar, even with custom tunings.

pricing

Open—Shape Pricing & Plans

Open—Shape operates on a freemium model, offering a robust free tier and an optional Pro upgrade for enhanced functionality.

  • Free: $0 – Includes the full chord engine with every voicing, all 33 built-in tunings, real acoustic playback, the mic tuner, and up to 3 saved progressions.
  • Pro: $9.99 one-time – Unlocks unlimited custom tunings and an expanded capacity for saving progressions.

Pros

  • +Extensive support for 33 built-in and unlimited custom guitar tunings.
  • +Provides real acoustic playback for all chord voicings, enhancing realism.
  • +Features a dedicated chord progression builder on an open canvas.
  • +Includes a mic tuner that accurately tracks custom tunings.
  • +Offers a fully functional free tier with core features.
  • +Maps real, playable voicings across the entire fretboard.

Cons

  • Does not explicitly mention advanced harmonic analysis features found in some competitors.
  • Lacks direct audio export options (e.g., WAV files) for progressions.
  • Does not include integrated practice tools like arpeggio trainers or metronomes.
  • No API available for external integrations.
  • Limited to guitar-specific applications, not a general music production tool.

Similar Tools

Open—Shape vs Competitors

Open—Shape distinguishes itself in the guitar tool market through its specialized focus on comprehensive tuning support and realistic acoustic playback, setting it apart from more general guitar learning or production-oriented applications.

1
Guitarmonizer

Offers advanced harmonic suggestions for jazz, modal, and chromatic progressions, and supports custom tunings for detailed voicing generation.

Guitarmonizer provides more in-depth harmonic analysis and suggestions compared to Open-Shape, which focuses more on mapping playable voicings. It might have a steeper learning curve for beginners due to its advanced features.

2
Guitar Tool Hub Chord Progression Player

Allows users to build progressions with over 800 voicings, apply various strumming/fingerpicking patterns, and download progressions as WAV audio files.

While Open-Shape focuses on fretboard mapping and real acoustic sounds, Guitar Tool Hub offers a wider array of strumming and fingerpicking patterns and the ability to export audio, which Open-Shape does not explicitly mention.

3
StrumForge

Combines a chord progression generator with triad and arpeggio trainers, scale tools, a metronome, and a guitar tuner in one app.

StrumForge offers additional practice tools like trainers and a tuner, which Open-Shape does not. However, its free tier has daily generation limits, unlike Open-Shape which is fully free for its core features.

4
Guitar Chords, Scales & Tools

Provides a comprehensive toolkit including a chord library, scale reference, fretboard explorer, and chord identifier, alongside a chord progression generator.

This tool offers a broader suite of guitar learning and theory tools beyond just chord progression building, which Open-Shape specializes in. Its progression generator might be less central or feature-rich than Open-Shape's dedicated builder.

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