# 51练琴 vs CastReader

The clearest difference is in-app purchases: 51练琴 at none against CastReader's 5. 51练琴 also leads on rating (5.0 vs 4.7) and iOS requirement (10.0 vs 17.6). CastReader's advantage is update cadence (every 2 days vs every 3 weeks) and ratings volume (43 vs 1). On price, ads and device support there is nothing between them.

Both are free to download. CastReader sells 5 in-app purchases, starting at $4.99 per month. 51练琴 asks for nothing beyond the download.

51练琴 holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: CastReader has 43 ratings behind it against 1, so its average is the more settled of the two.

51练琴 ships an update every 3 weeks, CastReader every 2 days. The most recent releases landed on November 3, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | 51练琴 | CastReader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/51/id1546600643/reviews)** | [4.7 (43 ratings)](https://appshunter.io/ios/app/castreader-read-aloud-books/id6757636395/reviews) |
| Number of ratings | 1 | **43** |
| Positive reviews | — | 96.8% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | **Free** | Freemium |
| Size | 100 MB | 208 MB |
| Requires iOS | **10.0** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Shanghai chengzhan Internet technology co. LTD](https://appshunter.io/developer/1339620059) | [ohsame Inc](https://appshunter.io/developer/944872977) |

## What reviewers say

### 51练琴

[App page](https://appshunter.io/ios/app/51/id1546600643)

This tool offers online music education services with high synchronization, sound fidelity, and low latency. It aims to boost profits and optimize operations for music schools and educational institutions, making online music lessons more professional, engaging, and interactive.

**Highlights:** Online music education services, High synchronization, High sound reproduction, Low latency, Profitability enhancement for institutions, Optimized institutional operations, Professional, fun, and interactive lessons

**Features:** macOS Compatibility

**In-app purchases:** none


### CastReader

[App page](https://appshunter.io/ios/app/castreader-read-aloud-books/id6757636395)

Transform your documents, web pages, and even photos into spoken audio with natural-sounding voices. Follow along with synchronized text highlighting and get AI-powered explanations for complex passages. Enjoy unlimited reading and premium features with a Pro subscription.

**Highlights:** Text-to-speech for documents and web, Synchronized text highlighting, AI-powered explanations, Import from camera, files, and web, Support for 32 languages, Kindle library integration, YouTube caption reading

**Features:** Safari Extension, Vision Pro support, iPhone Duo support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CastReader Pro (Monthly) | $4.99 | per month |
| CastReader Pro (Monthly) | $9.99 | per month |
| CastReader Pro (Yearly) | $34.99 | per year |
| CastReader Pro (Yearly) | $59.99 | per year |
| 120 Clone Voice Minutes | $2.99 | one-time |


## Frequently asked questions

### Is 51练琴 free?

51练琴 is free to download, with no in-app purchases.

### Is CastReader free?

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

### Which has better reviews, 51练琴 or CastReader?

51练琴 is rated higher. 51练琴 averages 5.0 out of 5 from 1 ratings, while CastReader averages 4.7 from 43 ratings.

### Do 51练琴 or CastReader have ads?

Neither 51练琴 nor CastReader shows ads.

### Which is updated more often, 51练琴 or CastReader?

51练琴 ships an update every 3 weeks, and CastReader every 2 days. Most recently, 51练琴 was updated on November 3, 2026 and CastReader on November 13, 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.*