Theoressa

Theory you can hear.

Free · In‑App Purchases

Theory you can hear: every scale and chord on keyboard, fretboard and staff, an interactive circle of fifths, short lessons, a self test and a free chromatic tuner. Theoressa is a music theory companion for players and learners. Pick any root and scale and see it on a piano keyboard, a guitar fretboard and a staff at once, hear it played, and read which chords it contains and why. WHAT YOU GET • Scale Explorer: every major and minor scale, the seven modes, pentatonic, blues, harmonic and melodic minor and more, from any root, with sharps or flats. • Keyboard, fretboard and staff diagrams that update together, with left-handed and clef options. • Chords and progressions: diatonic triads and sevenths for the current key, chord detail pages, and preset progressions you can transpose and play. • Intervals: names, sizes and sounds, with playback. • Sampled piano playback for every scale, chord and progression. • Self test: quizzes on scales, chords, intervals and keys, with your progress kept on the device and a retry of the questions you missed. • Learn: 20 short lessons, a glossary and an interactive circle of fifths. • Free chromatic tuner: a chromatic mode for any instrument or voice, plus presets for guitar (standard and drop D), 4-string bass, ukulele and violin. OFFLINE AND PRIVATE Everything is bundled with the app. No account, no sign-up, and nothing to download later. The only network use is for ads in the free version and for your subscription. The tuner listens through the microphone on your device in real time; the audio is never recorded, stored or sent. FREE AND PRO The free version includes a set of roots and scales, the tuner and the lessons, with a small banner ad. Theoressa Pro unlocks every root and scale, every chord and progression and the full self-test question pool, and removes ads. Available in English, Turkish and Spanish. SUBSCRIPTION TERMS • Theoressa Pro is one auto-renewing yearly subscription. New subscribers get a 1-week free trial. • The price is shown in the app before you subscribe. Payment is charged to your Apple Account (Apple ID) when you confirm the purchase or, if you start the free trial, when the trial ends. • The subscription renews automatically unless you cancel it at least 24 hours before the end of the current period. The renewal is charged within the 24 hours before the period ends. • You can manage or cancel the subscription at any time in your Apple Account settings. Restore purchases is in Settings → Subscription and on the Theoressa Pro screen. Terms of Use: https://intellicatdesign.com/theoressa/terms/ Privacy Policy: https://intellicatdesign.com/theoressa/privacy/

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The developer, HAKAN BEKMEZ, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Used to Track You

    The following data may be used to track you across apps and websites owned by other companies:

    • Identifiers

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Location
    • Identifiers
    • Usage Data

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
HAKAN BEKMEZ
Size
31.3 MB
Category
Music
Compatibility
Requires iOS 16.0 or later.
  • iPhone
    Requires iOS 16.0 or later.
  • iPad
    Requires iPadOS 16.0 or later.
Languages
English and 2 more
  • English, Spanish, Turkish
Age Rating
4+
In-App Purchases
Yes
Copyright
© 2026 Intellicat Design
  • Developer Website
  • Privacy Policy

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