# RainbowSky vs CaffTime Tutor

The clearest difference is in-app purchases: RainbowSky at none against CaffTime Tutor's 3. RainbowSky also leads on iOS requirement (12.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. CaffTime Tutor sells 3 one-off in-app purchases. RainbowSky asks for nothing beyond the download.

RainbowSky ships an update every 2 weeks, CaffTime Tutor every 3 weeks. The most recent releases landed on October 6, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | RainbowSky | CaffTime Tutor |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Size | 292 MB | 48 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Open Knowledge Association Ltd.](https://appshunter.io/developer/868011308) | [Chun Yu Chow](https://appshunter.io/developer/6793169898) |

## What reviewers say

### RainbowSky

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

**In-app purchases:** none


### CaffTime Tutor

[App page](https://appshunter.io/ios/app/cafftime-tutor/id6793169896)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CaffTime Credit | $4.99 | one-time |
| CaffTime Credit | $8.99 | one-time |
| CaffTime Credit | $14.99 | one-time |


## Frequently asked questions

### Is RainbowSky free?

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

### Is CaffTime Tutor free?

CaffTime Tutor is free to download, with in-app purchases available.

### Do RainbowSky or CaffTime Tutor have ads?

Neither RainbowSky nor CaffTime Tutor shows ads.

### Which is updated more often, RainbowSky or CaffTime Tutor?

RainbowSky ships an update every 2 weeks, and CaffTime Tutor every 3 weeks. Most recently, RainbowSky was updated on October 6, 2026 and CaffTime Tutor on October 2, 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.*