# RainbowOne vs SingRobot

The clearest difference is in-app purchases: SingRobot at none against RainbowOne's 6. RainbowOne's advantage is update cadence (every 2 months vs every 6 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. RainbowOne sells 6 one-off in-app purchases. SingRobot asks for nothing beyond the download.

RainbowOne ships an update every 2 months, SingRobot every 6 months. The most recent releases landed on September 23, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | RainbowOne | SingRobot |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (2 ratings)](https://appshunter.io/ios/app/rainbowone/id1019429184/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 6 months |
| Monetization | Free with in-app purchases | — |
| Size | 287 MB | 552 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Open Knowledge Association Ltd.](https://appshunter.io/developer/868011308) | [Singapore Arts Pte Ltd](https://appshunter.io/developer/1810406617) |

## What reviewers say

### RainbowOne

[App page](https://appshunter.io/ios/app/rainbowone/id1019429184)

Create and deliver interactive e-learning materials with a powerful e-book editor. Engage students through cross-platform lessons, auto-corrected exercises, and instant learning data analysis. Share and discover educational content in a dedicated bookstore.

**Highlights:** Innovative e-book editor with 80+ tools, Cross-platform interactive lessons, Auto-corrected exercises, Instant learning data analysis, Bookstore for sharing and editing e-books, Class management tools

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 8個金幣 | $0.99 | one-time |
| 48個金幣 | $5.99 | one-time |
| 98個金幣 | $12.99 | one-time |
| 218個金幣 | $27.99 | one-time |
| 368個金幣 | $46.99 | one-time |
| 688個金幣 | $89.99 | one-time |


### SingRobot

[App page](https://appshunter.io/ios/app/singrobot/id6745006827)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RainbowOne free?

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

### Is SingRobot free?

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

### Do RainbowOne or SingRobot have ads?

Neither RainbowOne nor SingRobot shows ads.

### Which is updated more often, RainbowOne or SingRobot?

RainbowOne ships an update every 2 months, and SingRobot every 6 months. Most recently, RainbowOne was updated on September 23, 2026 and SingRobot on September 17, 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.*