String AI: Strings Practice
AI practice coach for strings
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
String AI is an AI practice coach built exclusively for violin, viola, and cello. It listens to every note, watches your form, scores every attempt, and tells you exactly what to fix — in real time.
Its scoring standards were designed and reviewed together by violin, viola, and cello teachers trained at Curtis, Colburn, Seoul National University, Eastman, Manhattan School of Music, USC, and CIM. The standard a world-class teacher holds you to, applied to every minute you practice.
THE STRUCTURE OF A LESSON, EVERY TIME YOU PRACTICE
String AI plans your session, scores each attempt across five axes, diagnoses what needs work, and prescribes drills that target it. You always know what to work on next — and why.
GOOD PRACTICE HABITS, BUILT IN
Set a target date for any piece and String AI paces you to it — planning each day's session, tracking whether you're ahead or behind, and warning you early if the timeline isn't realistic. Spots that need work aren't glossed over: the AI isolates them into short drills just a few measures long and has you repeat exactly those spots. This is how serious players practice — and the app makes it a habit.
WHAT IT SCORES (5 AXES + SUPPORTING)
- Intonation — real-time pitch tracking, note by note
- Rhythm — timing and steadiness
- Tone — clarity and quality of sound
- Dynamics — control of loud and soft
- Posture & bowing — on-device vision analysis of your form
Supporting checks such as vibrato complete the picture, so your next priority is always clear.
BUILT FOR STRINGS — NOT A GENERIC MUSIC APP
Violin, viola, and cello each receive instrument-specific analysis, tuned to how the instrument is actually played.
WORKS WITH YOUR TEACHER (OPTIONAL)
Enter your teacher's invite code and the week between lessons stops being a blind spot. Your teacher sees your practice time, five-axis scores, weak points, and assignment progress — and can send back assignments, teaching notes that steer the AI coach toward what they want you working on, and markings written directly on your sheet music. Off by default, on only once you enter the code, and revocable at any time. Recordings are never shared — none are ever stored.
YOUR SOUND NEVER LEAVES YOUR DEVICE
Audio and video are processed entirely on your device — never stored, never uploaded. Only your practice scores are saved to your account. No ads. No tracking.
PLANS
Start with a 7-day free trial, then choose a plan by daily practice volume. Each plan includes a daily baseline and a monthly total: practice up to three times your baseline on busy days, and unused minutes carry forward within your monthly total.
- Basic — 15 min/day baseline · 450 min/month
- Casual — 30 min/day baseline · 900 min/month
- Standard — 45 min/day baseline · 1,350 min/month
- Pro — 60 min/day baseline · 1,800 min/month
Subscriptions renew automatically; cancel anytime in your account settings.
Terms of Use (EULA): https://youna-string.github.io/stringai-legal/terms-of-service.html
Privacy Policy: https://youna-string.github.io/stringai-legal/privacy-policy.html
For a fraction of the cost of a single private lesson, String AI coaches every practice session, every day. From beginners building intonation to advanced players refining tone — make every minute count.
Students under 14 require a parent's consent before use, in line with children's privacy laws.
A big reliability update, plus a new Practice Room.
• Practice Room — a free-play space with a large tuner, metronome, and drone. Recordings stay on your device.
• Practice journal — jot a line after each session, see it on your calendar, and delete any entry you don't want to keep.
• Score markup — write on your sheet music with a pen and eraser; pinch to zoom.
• Sharper AI coaching — feedback now sticks strictly to what was actually played, so you'll never see a comment about a passage you haven't tried yet.
• More accurate scoring for dynamics and note timing.
• Clearer progress: your calendar now shows what each mark means, and practice totals update right away.
• Fixes: subscription tier is read correctly after a plan change, loading errors no longer look like "no data," and the first tap after typing now registers.
The developer, Youna Choi, 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 Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Contact Info
- User Content
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Youna Choi
- Size
- 90.5 MB
- Category
- Education
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Korean
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Casual $29.99
- Basic $14.99
- Standard $44.99
- Pro $59.99
- Copyright
- © 2026 Youna Choi