IDOUDO: Movable Do Solfège
12-key sight-reading, 3 clefs
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Practice sight-reading with movable Do in all 12 keys. Supports treble, bass, and alto clefs—for community orchestra reading and jazz or pop sessions. C and G are free.
IDOUDO is a practice app for quickly reading notes on the staff with movable Do in each key.
Answer each displayed note using the Do, Re, Mi, Fa, Sol, La, and Ti buttons. When the key changes, the same position on the staff has a different movable-Do syllable. Practice this essential movable-Do skill repeatedly in all 12 keys.
In addition to treble and bass clefs, IDOUDO supports the alto clef, a feature rarely found in music practice apps. It is useful both for the daily practice of musicians who read alto-clef music and for those who want to become more fluent in every key as they expand into jazz and pop sessions.
If you are just beginning to read staff notation, start with the key of C. In C, Do–Re–Mi and C–D–E correspond directly, so you can also use IDOUDO to practice the fundamentals of reading standard notation.
DRILLS IN VERSION 1.0
• 1 Note
• 2 Notes
• 1 Triad
• 1 Seventh Chord
KEY FEATURES
• Practice in all 12 keys
• Treble and bass clefs, plus the alto clef used by viola
• Note ranges for piano, guitar, violin, viola, cello, wind instruments, voice, and more
• Beginner, Intermediate, Advanced, and Custom ranges
• Fast 10-question rounds
• Average response time, mistakes, and personal-best records
• Up to 50 local profiles
• Shareable result cards and progress
• Light and Dark Mode
READ CHORDS WITH MOVABLE DO
For triads and seventh chords, answer chord tones from bottom to top. The result also shows the chord symbol and Roman-numeral degree name.
NEW TO STAFF NOTATION?
The in-app Getting Started with Staff Notation guide explains why the key of C is a good place to begin, includes a quick note-reference chart, and shows how to use the app for classical music, ensemble playing, and sessions, with a suggested practice path.
PRICING
Keys C and G are free in every drill. The other 10 keys can be unlocked permanently with a separate one-time in-app purchase for each drill. There is no subscription.
No ads are displayed, and no account registration is required. Profiles and practice records are stored on your device.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Kosuke Mawatari, 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 Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Kosuke Mawatari
- Size
- 2.2 MB
- Category
- Music
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Unlock Keys: 1 Seventh Chord $1.99
- Unlock All Keys: 1 Triad $1.99
- Unlock All Keys: 2 Notes $1.99
- Unlock All Keys: 1 Note $1.99
- Copyright
- © 2026 馬渡康輔