# 蓝铅笔 vs PerturbLab

The clearest difference is in-app purchases: PerturbLab at none against 蓝铅笔's 5. 蓝铅笔's advantage is update cadence (every 3 weeks vs every 2 months) and iOS requirement (11.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. 蓝铅笔 sells 4 one-off in-app purchases. PerturbLab asks for nothing beyond the download.

蓝铅笔 ships an update every 3 weeks, PerturbLab every 2 months. The most recent releases landed on October 6, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | 蓝铅笔 | PerturbLab |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.4 (5 ratings)](https://appshunter.io/ios/app/id1156741946/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Size | 184 MB | 6 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Hangzhou Duoji Education Technology Co., Ltd.](https://appshunter.io/developer/1093458206) | [ZHENZHOU SHI](https://appshunter.io/developer/1889489141) |

## What reviewers say

### 蓝铅笔

[App page](https://appshunter.io/ios/app/id1156741946)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 10个肥皂 | $1.99 | one-time |
| 蓝铅笔18元学习课程 | $2.99 | one-time |
| 100个肥皂 | $17.99 | one-time |
| 100个肥皂 | $21.99 | one-time |


### PerturbLab

[App page](https://appshunter.io/ios/app/perturblab/id6782048075)

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

**In-app purchases:** none


## Frequently asked questions

### Is 蓝铅笔 free?

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

### Is PerturbLab free?

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

### Do 蓝铅笔 or PerturbLab have ads?

Neither 蓝铅笔 nor PerturbLab shows ads.

### Which is updated more often, 蓝铅笔 or PerturbLab?

蓝铅笔 ships an update every 3 weeks, and PerturbLab every 2 months. Most recently, 蓝铅笔 was updated on October 6, 2026 and PerturbLab on October 28, 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.*