# 视频格式转换 vs Standard Deviation Calculate

The clearest difference is update cadence: Standard Deviation Calculate at every 2 months against 视频格式转换's every 15 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 视频格式转换 sells 7 in-app purchases, starting at $4.49 per 3 months and Standard Deviation Calculate sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

视频格式转换 ships an update every 15 months, Standard Deviation Calculate every 2 months. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | 视频格式转换 | Standard Deviation Calculate |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (3 ratings)](https://appshunter.io/ios/app/standard-deviation-calculate/id1600862053/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 2 months** |
| Monetization | — | Free |
| Size | 43 MB | 5 MB |
| Requires iOS | 11.0 | 11.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [深圳易元淘金网络科技有限公司](https://appshunter.io/developer/1247902921) | [天一 邓](https://appshunter.io/developer/1056154014) |

## What reviewers say

### 视频格式转换

[App page](https://appshunter.io/ios/app/id1593821353)

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 季度续订 | $4.49 | per 3 months |
| 10次保存 | $1.99 | one-time |
| 月会员 | $1.99 | one-time |
| 100次保存 | $4.99 | one-time |
| 季度会员 | $4.99 | one-time |
| 年VIP | $9.99 | one-time |
| 终身会员 | $14.99 | one-time |


### Standard Deviation Calculate

[App page](https://appshunter.io/ios/app/standard-deviation-calculate/id1600862053)

This utility calculates the standard deviation of a dataset, a key statistical measure of data dispersion. It helps understand how spread out values are from the average, with applications in science, industry, and finance.

**Highlights:** Calculate standard deviation, Measure data dispersion, Understand variation from mean, Applications in science and finance, Statistical analysis tool

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 标准差计算器专业版 | $2.99 | one-time |


## Frequently asked questions

### Is 视频格式转换 free?

视频格式转换 is free to download, with in-app purchases available.

### Is Standard Deviation Calculate free?

Standard Deviation Calculate is free to download, with in-app purchases available.

### Do 视频格式转换 or Standard Deviation Calculate have ads?

Neither 视频格式转换 nor Standard Deviation Calculate shows ads.

### Which is updated more often, 视频格式转换 or Standard Deviation Calculate?

视频格式转换 ships an update every 15 months, and Standard Deviation Calculate every 2 months. Most recently, 视频格式转换 was updated on November 3, 2026 and Standard Deviation Calculate on November 7, 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.*