# UML教程 vs 读库

The clearest difference is review sentiment: 读库 at 64% against UML教程's 0%. 读库 also leads on price (Free vs $1.99) and rating (4.3 vs 1.0). UML教程's advantage is in-app purchases (none vs 3) and iOS requirement (12.0 vs 15.0). On ads and device support there is nothing between them.

读库 is free to download; UML教程 costs $1.99 up front. 读库 sells 3 one-off in-app purchases. UML教程 asks for nothing beyond the download.

读库 holds the better App Store score, 4.3 against 1.0. That said, the two scores are not equally well evidenced: 读库 has 35 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of UML教程's written reviews are positive against 64% of 读库's.

UML教程 ships an update every 27 months, 读库 every 3 weeks. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | UML教程 | 读库 |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/uml/id1116370902/reviews) | **[4.3 (35 ratings)](https://appshunter.io/ios/app/id1592613682/reviews)** |
| Number of ratings | 1 | **35** |
| Positive reviews | 0.0% of reviews | **64.4% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 27 months | **Every 3 weeks** |
| Monetization | Paid | — |
| Size | 19 MB | 106 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [强 马](https://appshunter.io/developer/687218962) | [读库](https://appshunter.io/developer/1592613684) |

## What reviewers say

### UML教程

[App page](https://appshunter.io/ios/app/uml/id1116370902)

Learn the Unified Modeling Language (UML) with this comprehensive tutorial. It covers foundational concepts, various diagram types, and includes 23 design pattern UML diagrams. Ideal for developers and programmers seeking to understand and use UML.

**Highlights:** UML basics and overview, Comprehensive diagram types, 23 design pattern UML diagrams, UML quick guide and summary, Practice exam questions and answers, Covers UML 2.0

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

**In-app purchases:** none


### 读库

[App page](https://appshunter.io/ios/app/id1592613682)

This app offers multi-perspective reference materials for annual members, including behind-the-scenes content, interviews, and event follow-ups in various media formats. Users can also build their personal knowledge base using the app's small utility tools. Start enhancing your knowledge with this app today!

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 购买文章（永久可读） | $0.99 | one-time |
| 读库App一年会员权益 | $24.99 | one-time |
| 读库2022年全年阅读计划 | $39.99 | one-time |


## Frequently asked questions

### Is UML教程 free?

UML教程 costs $1.99, with no in-app purchases.

### Is 读库 free?

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

### Which has better reviews, UML教程 or 读库?

读库 is rated higher. UML教程 averages 1.0 out of 5 from 1 ratings, while 读库 averages 4.3 from 35 ratings.

### Do UML教程 or 读库 have ads?

Neither UML教程 nor 读库 shows ads.

### Which is updated more often, UML教程 or 读库?

UML教程 ships an update every 27 months, and 读库 every 3 weeks. Most recently, UML教程 was updated on November 2, 2026 and 读库 on November 7, 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.*