# 피아노 레슨 카드 vs String AI

The clearest difference is in-app purchases: 피아노 레슨 카드 at none against String AI's 3. 피아노 레슨 카드 also leads on update cadence (daily vs fortnightly) and iOS requirement (13.0 vs 16.4). On price, ads and device support there is nothing between them.

Both are free to download. String AI sells 3 in-app purchases, starting at $13.99 per month. 피아노 레슨 카드 asks for nothing beyond the download.

피아노 레슨 카드 ships an update daily, String AI fortnightly. The most recent releases landed on October 31, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | 피아노 레슨 카드 | String AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (6 ratings)](https://appshunter.io/ios/app/string-ai-violin-viola-cello/id6787829281/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | — | 83.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Fortnightly |
| Monetization | — | Free with in-app purchases |
| Size | 21 MB | 181 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Shinhye Lee](https://appshunter.io/developer/1707333313) | [Youna Choi](https://appshunter.io/developer/6787829283) |

## What reviewers say

### 피아노 레슨 카드

[App page](https://appshunter.io/ios/app/id6760224601)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### String AI

[App page](https://appshunter.io/ios/app/string-ai-violin-viola-cello/id6787829281)

This app provides AI-powered feedback for practicing violin, viola, and cello. It offers structured lesson plans, real-time analysis of pitch, rhythm, dynamics, tone, and posture, along with music theory and ear training modules. Connect with teachers to share progress and assignments.

**Highlights:** AI-powered playing feedback, Lesson plans and music classes, Pitch, rhythm, dynamics, tone, and posture analysis, Ear training and music theory, Sheet music import and editing, Tuner and metronome, Teacher connection and progress sharing

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic | $13.99 | per month |
| Casual | $26.99 | per month |
| Standard | $39.99 | per month |


## Frequently asked questions

### Is 피아노 레슨 카드 free?

피아노 레슨 카드 is free to download, with no in-app purchases.

### Is String AI free?

String AI is free to download, with in-app purchases available.

### Do 피아노 레슨 카드 or String AI have ads?

Neither 피아노 레슨 카드 nor String AI shows ads.

### Which is updated more often, 피아노 레슨 카드 or String AI?

피아노 레슨 카드 ships an update daily, and String AI fortnightly. Most recently, 피아노 레슨 카드 was updated on October 31, 2026 and String AI on November 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*