# 溝通易 3.0 vs RainbowSky

The clearest difference is update cadence: RainbowSky at every 2 weeks against 溝通易 3.0's every 3 months. RainbowSky also leads on iOS requirement (12.0 vs 15.0). 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.

溝通易 3.0 ships an update every 3 months, RainbowSky every 2 weeks. The most recent releases landed on October 20, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | 溝通易 3.0 | RainbowSky |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 209 MB | 292 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hong Chi Association](https://appshunter.io/developer/645391618) | [Open Knowledge Association Ltd.](https://appshunter.io/developer/868011308) |

## What reviewers say

### 溝通易 3.0

[App page](https://appshunter.io/ios/app/30/id1580493278)

This app assists individuals with low verbal abilities or who are non-native Cantonese speakers to communicate using text. It offers customizable communication cards with extensive image libraries, text-to-speech functionality, and a Cantonese Pinyin keyboard to facilitate online and offline interaction.

**Highlights:** Customizable communication files, Over 1500 image cards, Text-to-speech functionality, Cantonese Pinyin keyboard, Three training games, File sharing

**Features:** macOS Compatibility

**In-app purchases:** none


### RainbowSky

[App page](https://appshunter.io/ios/app/rainbowsky/id6771268020)

**In-app purchases:** none


## Frequently asked questions

### Is 溝通易 3.0 free?

溝通易 3.0 is free to download, with no in-app purchases.

### Is RainbowSky free?

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

### Do 溝通易 3.0 or RainbowSky have ads?

Neither 溝通易 3.0 nor RainbowSky shows ads.

### Which is updated more often, 溝通易 3.0 or RainbowSky?

溝通易 3.0 ships an update every 3 months, and RainbowSky every 2 weeks. Most recently, 溝通易 3.0 was updated on October 20, 2026 and RainbowSky on October 6, 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.*