# 彩虹图 vs 机友计算器pro

The clearest difference is update cadence: 机友计算器pro at every 7 months against 彩虹图's every 38 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

彩虹图 ships an update every 38 months, 机友计算器pro every 7 months. The most recent releases landed on October 7, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | 彩虹图 | 机友计算器pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 7 months** |
| Size | 21 MB | 59 MB |
| Requires iOS | **10.0** | 11.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [泽勇 周](https://appshunter.io/developer/1123422146) | [Changsha Fugui Bamboo Network Technology Co., Ltd.](https://appshunter.io/developer/1458061020) |

## What reviewers say

### 彩虹图

[App page](https://appshunter.io/ios/app/id1481676023)

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

**In-app purchases:** none


### 机友计算器pro

[App page](https://appshunter.io/ios/app/pro/id1546706241)

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

**In-app purchases:** none


## Frequently asked questions

### Is 彩虹图 free?

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

### Is 机友计算器pro free?

机友计算器pro is free to download, with no in-app purchases.

### Do 彩虹图 or 机友计算器pro have ads?

Neither 彩虹图 nor 机友计算器pro shows ads.

### Which is updated more often, 彩虹图 or 机友计算器pro?

彩虹图 ships an update every 38 months, and 机友计算器pro every 7 months. Most recently, 彩虹图 was updated on October 7, 2026 and 机友计算器pro on October 18, 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.*