# CSDN vs Algorithms

The clearest difference is review sentiment: Algorithms at 100% against CSDN's 45%. Algorithms also leads on ads (none vs shown) and rating (5.0 vs 4.7). CSDN's advantage is ratings volume (1.7K vs 2) and chart position (#117 vs unranked). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. CSDN sells 15 in-app purchases, starting at $12.99 per month and Algorithms sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Algorithms holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: CSDN has 1.7K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 45% of CSDN's written reviews are positive against 100% of Algorithms's.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 16, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | CSDN | Algorithms |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (1.7K ratings)](https://appshunter.io/ios/app/csdn/id1437086352/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/algorithms-animated-learning/id6744860350/reviews)** |
| Number of ratings | **1.7K** | 2 |
| Positive reviews | 45.2% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Weekly | Weekly |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#117** | — |
| Size | 180 MB | 17 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CSDN Network Technology Co., Ltd.](https://appshunter.io/developer/1518701308) | [琰琰 胡](https://appshunter.io/developer/1809315777) |

## What reviewers say

### CSDN

[App page](https://appshunter.io/ios/app/csdn/id1437086352)

**Currently charting:** #117 Top Free · Developer Tools (US App Store)

This app is a professional technical platform for developers, offering a vast collection of code resources, training courses, expert Q&A, and the latest industry news. It aims to solve programming challenges and provide reliable answers for all technical queries.

**Highlights:** Extensive code resources, Professional training courses, One-on-one expert Q&A, Latest industry news, Programming learning platform, Technical Q&A

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

**In-app purchases (15)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP连续包月 | $12.99 | per month |
| OpenClaw体验包 | $2.99 | one-time |
| 30元储值币 | $3.99 | one-time |
| 50元储值币 | $6.99 | one-time |
| 68元储值币 | $9.99 | one-time |
| 100元储值币 | $14.99 | one-time |
| CSDN VIP 月卡 | $14.99 | one-time |
| 128元储值币 | $19.99 | one-time |
| C知道360天权益卡 | $22.99 | one-time |
| 200元储值币 | $29.99 | one-time |
| 268元储值币 | $39.99 | one-time |
| CSDN VIP 年卡 | $39.99 | one-time |
| 328元储值币 | $49.99 | one-time |
| CSDN 超级VIP年卡 | $59.99 | one-time |
| CSDN VIP两年卡 | $69.99 | one-time |

**What reviewers like**

- 💡 Suggested feature: Auto-reading mode
- 💡 Suggested feature: Double-tap to like articles
- 🚀 Resource-rich platform for programmers

**What reviewers complain about**

- 🐛 Frequent crashes and bugs
- 🚫 Excessive ads and paywalls
- 🚫 Difficult to use without downloading the app
- 🚫 Lack of international phone number support for registration

**Reported bugs**

- Inability to load full articles on mobile web
- App not working on older iOS versions
- Frequent network connection issues

**Requested features**

- Add English version
- Implement iPad landscape mode with multi-window support
- Introduce more international phone number verification options
- Improve search functionality and article discovery
- Implement automatic night mode


### Algorithms

[App page](https://appshunter.io/ios/app/algorithms-animated-learning/id6744860350)

This app makes learning complex algorithms intuitive through dynamic, step-by-step animations and line-by-line code analysis. It offers case-based problem explanations, in-depth algorithm analysis, and weekly updates with trending problems. Ideal for students, job seekers, and competitive programmers.

**Highlights:** Dynamic animated demonstrations, Line-by-line code analysis, Case-based problem explanations, Algorithm analysis and insights, Weekly trending algorithm updates

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock easy problems | $1.99 | one-time |
| Unlock medium & hard problems | $2.99 | one-time |
| Unlock all problems | $3.99 | one-time |


## Frequently asked questions

### Is CSDN free?

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

### Is Algorithms free?

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

### Which has better reviews, CSDN or Algorithms?

Algorithms is rated higher. CSDN averages 4.7 out of 5 from 1.7K ratings, while Algorithms averages 5.0 from 2 ratings.

### Do CSDN or Algorithms have ads?

CSDN shows ads; Algorithms does not.

### Which is updated more often, CSDN or Algorithms?

CSDN ships an update weekly, and Algorithms weekly. Most recently, CSDN was updated on October 16, 2026 and Algorithms on September 27, 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.*