# 阅燃 vs Delta

The clearest difference is in-app purchases: 阅燃 at none against Delta's 3. 阅燃 also leads on iOS requirement (11.0 vs 13.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Delta sells 3 one-off in-app purchases. 阅燃 asks for nothing beyond the download.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 5, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | 阅燃 | Delta |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.1 (7 ratings)](https://appshunter.io/ios/app/delta-algorithms/id1436506800/reviews)** |
| Number of ratings | — | **7** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | Monthly |
| Monetization | — | Freemium |
| Size | 101 MB | 5 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Chengdu Zhixin Technology Co,.Ltd.](https://appshunter.io/developer/1536893274) | [Groupe MINASTE](https://appshunter.io/developer/1378426984) |

## What reviewers say

### 阅燃

[App page](https://appshunter.io/ios/app/id1186238420)

**Features:** macOS Compatibility

**In-app purchases:** none


### Delta

[App page](https://appshunter.io/ios/app/delta-algorithms/id1436506800)

This app helps users solve math problems by creating and executing algorithms. It offers tools for homework checking, test preparation, and creating custom quizzes. Users can save, share, and download algorithms via the cloud.

**Highlights:** Create algorithms with natural language, Execute algorithms to solve math problems, Create and download custom quizzes, Save and share algorithms, Cloud synchronization for algorithms

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Donation 1 | $0.99 | one-time |
| Donation 2 | $2.99 | one-time |
| Donation 3 | $4.99 | one-time |


## Frequently asked questions

### Is 阅燃 free?

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

### Is Delta free?

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

### Do 阅燃 or Delta have ads?

Neither 阅燃 nor Delta shows ads.

### Which is updated more often, 阅燃 or Delta?

阅燃 ships an update monthly, and Delta monthly. Most recently, 阅燃 was updated on October 5, 2026 and Delta on October 14, 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.*