# 黑马艺术学校 vs Logarithm Rules Calculator

The clearest difference is in-app purchases: 黑马艺术学校 at none against Logarithm Rules Calculator's 8. 黑马艺术学校 also leads on iOS requirement (9.0 vs 15.0). Logarithm Rules Calculator's advantage is update cadence (every 3 weeks vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Logarithm Rules Calculator sells 8 one-off in-app purchases. 黑马艺术学校 asks for nothing beyond the download.

黑马艺术学校 ships an update every 2 months, Logarithm Rules Calculator every 3 weeks. The most recent releases landed on September 10, 2026 and August 17, 2026 respectively.

## The numbers

| Metric | 黑马艺术学校 | Logarithm Rules Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Size | 146 MB | 182 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [杭州络绎网络科技有限公司](https://appshunter.io/developer/1341270049) | [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809) |

## What reviewers say

### 黑马艺术学校

[App page](https://appshunter.io/ios/app/id1328189736)

**Features:** macOS Compatibility

**In-app purchases:** none


### Logarithm Rules Calculator

[App page](https://appshunter.io/ios/app/logarithm-rules-calculator/id1662899656)

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| +30 User Tokens | $0.29 | one-time |
| +1 Convenience Token / 6h, max. +2 | $0.59 | one-time |
| +2 Convenience Tokens / 6h, max. +4 | $0.99 | one-time |
| +150 User Tokens | $0.99 | one-time |
| +300 User Tokens | $1.49 | one-time |
| +4 Convenience Tokens / 6h, max. +8 | $1.59 | one-time |
| Remove Ads | $1.99 | one-time |
| Lifetime Access | $1.99 | one-time |


## Frequently asked questions

### Is 黑马艺术学校 free?

黑马艺术学校 is free to download, with no in-app purchases.

### Is Logarithm Rules Calculator free?

Logarithm Rules Calculator is free to download, with in-app purchases available.

### Do 黑马艺术学校 or Logarithm Rules Calculator have ads?

Neither 黑马艺术学校 nor Logarithm Rules Calculator shows ads.

### Which is updated more often, 黑马艺术学校 or Logarithm Rules Calculator?

黑马艺术学校 ships an update every 2 months, and Logarithm Rules Calculator every 3 weeks. Most recently, 黑马艺术学校 was updated on September 10, 2026 and Logarithm Rules Calculator on August 17, 2026.

---

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