Piano ∞ vs IDOUDO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Piano ∞
This app offers a comprehensive piano experience with five instruments, sheet music, lessons, and composing tools. It features AI-powered sheet music progression and realistic sound. An optional subscription unlocks a vast song catalog and advanced creation features.
- Five instrument options
- Interactive sheet music
- AI-powered lesson progression
- Composing and recording tools
- Realistic concert grand piano sound
- Play-along feature
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Piano Infinity is everything you will ever need in a piano. Get access to five instruments with sheet music, piano lessons, composing, and recording features. You can even play along on your own keyboard and Piano Infinity will keep up with the notes you play, progressing only if you play the right note. Piano Infinity uses smart AI to identify when you play the correct key, moving the sheet music along with you! Piano Infinity feels and sounds like a real concert grand piano. Don't wait, download Piano Infinity and get started for free today! Piano Infinity is free to download and play! Some users may choose to access the optional Music Studio Pass which includes hundreds of songs with sheet music and fingering for both left and right hands. The Music Studio Pass also allows users to create, edit, and save an unlimited number of songs! MUSIC STUDIO PASS SUBSCRIPTION - You can subscribe for unlimited access to our complete song and instrument catalog - The subscriptions are $0.99 weekly, $9.99 for 3 months, $34.99 yearly* - You'll be able to perform all available songs on any instrument for the duration of your subscription as well as create, edit, and save unlimited songs - Payment will be charged to iTunes Account at confirmation of purchase - Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period - Account will be charged for renewal within 24-hours prior to the end of the current period at the cost of the chosen package - Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase - No cancellation of the current subscription is allowed during active subscription period - You can read our privacy policy and terms of use at at www.betterdaywireless.com/privacy - Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication *Price are equal to the value that "Apple's App Store Matrix" determines is the equivalent of the subscription price in $USD.
IDOUDO
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Read notes fast in movable Do. Name the notes you hear. Sing famous melodies in all 12 keys. IDOUDO is a solfège app for practicing all three, a few minutes a day — for jazz and pop sessions, playing by ear, and reading parts in choirs and ensembles, so a key change never throws you off. Ear Training and Melody Shadowing are new in version 1.1. 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 Reading • Single notes: 1 Note, 2 Notes • 1 Triad • 1 Seventh Chord Listening • Ear training: 2, 3, and 4 notes • Melody Shadowing: Major set 1, Major set 2, Minor set 1 EAR TRAINING After a Do-Mi-Sol chord, listen to the notes and name them in movable Do. The answer buttons form a "staircase" from low on the left to high on the right, so you answer the pitch height too. A foundation for playing by ear. MELODY SHADOWING Hum short melodies from famous pieces in movable Do while the key changes. There is no scoring. Each time the key changes, an I–ii–V–I cue sets the new key's Do in your ear, and Do keeps sounding as the accompaniment while you sing. Songs: Twinkle Twinkle Little Star, Canon, When the Saints Go Marching In, Ode to Joy, Swing Low, Sweet Chariot, Furusato, Sakura Sakura, Fate (Symphony No. 5), and Kojo no Tsuki (minor keys are read from La). It is also good practice for the pentatonic and major scales. 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 • Pin the drills you practice to the top of Home • Built-in know-how, including how to practice each drill • 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 in either of two ways: • A one-time in-app purchase for each drill • All Drills, an auto-renewable subscription (monthly with a 1-month free trial, or yearly) that also includes drills added in the future. Prices are shown in the app and on the App Store. The subscription renews automatically at the same price unless canceled at least 24 hours before the end of the current period. Payment is charged to your Apple Account. Manage or cancel it in Settings > [your name] > Subscriptions. The free trial is available once, on the monthly plan; cancel at least 24 hours before it ends and you won't be charged. No ads are displayed, and no account registration is required. Profiles and practice records are stored on your device. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is update cadence: IDOUDO at every 3 weeks against Piano ∞'s every 9 months. Piano ∞'s advantage is iOS requirement (13.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Piano ∞ sells 4 in-app purchases, starting at $2.99 per 7 days and IDOUDO sells 12 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.
Piano ∞ ships an update every 9 months, IDOUDO every 3 weeks. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.
| Parameter | Piano ∞ | IDOUDO |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (567 ratings) — better | — |
| Positive reviews | 79.1% of reviews | — |
| Number of ratings | 567 — better | — |
| Update frequency | Every 9 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 88 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Better Day Wireless, Inc. | Kosuke Mawatari |
Bugs and requests
Piano ∞
Reported bugs
3 issues- Subscription auto-renewal issues
- Keyboard not responsive at times
- Certain notes or pitches sound off-key
Requested features
4 requests- Add more free songs and content
- Allow users to import their own songs
- Improve note visualization and scrolling
- Add more advanced music editing tools
IDOUDO
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Piano ∞
- Unlimited Use7 Days trial$2.997 Days
- Unlimited Use$9.993 Months
- 1 Month Music Studio Pass$9.991 Month
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- Unlimited Use$59.991 Year
IDOUDO
- All Drills (Monthly)1 Month trial$2.991 Month
- All Drills (Yearly)$19.991 Year
- Unlock All Keys: Ear 2 Notes$1.99
- Unlock All Keys: Ear 3 Notes$1.99
- Unlock All Keys: Ear 4 Notes$1.99
Show 7 moreShow fewer
- Unlock All Keys: Major Set 1$1.99
- Unlock All Keys: Minor Set 1$1.99
- Unlock All Keys: Major Set 2$1.99
- Unlock All Keys: 1 Note$1.99
- Unlock All Keys: 2 Notes$1.99
- Unlock All Keys: 1 Triad$1.99
- Unlock Keys: 1 Seventh Chord$1.99









