# 演算写字板 vs 弹幕小檬

The clearest difference is in-app purchases: 演算写字板 at none against 弹幕小檬's 1. 演算写字板 also leads on update cadence (every 10 days vs every 7 months) and iOS requirement (9.0 vs 13.0). On price, ads and device support there is nothing between them.

Both are free to download. 弹幕小檬 sells 1 one-off in-app purchase. 演算写字板 asks for nothing beyond the download.

演算写字板 ships an update every 10 days, 弹幕小檬 every 7 months. Both last shipped on September 10, 2026.

## The numbers

| Metric | 演算写字板 | 弹幕小檬 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 7 months |
| Size | 12 MB | 16 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [志化 彭](https://appshunter.io/developer/1226811775) | [Shanghai Yuanmeng Information Technology Company Limited](https://appshunter.io/developer/923330075) |

## What reviewers say

### 演算写字板

[App page](https://appshunter.io/ios/app/whiteboard/id1616507212)

**Features:** macOS Compatibility

**In-app purchases:** none


### 弹幕小檬

[App page](https://appshunter.io/ios/app/call/id1619343755)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 请开发者喝一杯可乐 | $0.99 | one-time |


## Frequently asked questions

### Is 演算写字板 free?

演算写字板 is free to download, with no in-app purchases.

### Is 弹幕小檬 free?

弹幕小檬 is free to download, with in-app purchases available.

### Do 演算写字板 or 弹幕小檬 have ads?

Neither 演算写字板 nor 弹幕小檬 shows ads.

### Which is updated more often, 演算写字板 or 弹幕小檬?

演算写字板 ships an update every 10 days, and 弹幕小檬 every 7 months. Most recently, 演算写字板 was updated on September 10, 2026 and 弹幕小檬 on September 10, 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.*