# RubySketch vs App大学 (旧Flutter大学)

The clearest difference is review sentiment: RubySketch at 100% against App大学 (旧Flutter大学)'s 33%. App大学 (旧Flutter大学)'s advantage is ads (none vs shown) and update cadence (every 9 days vs every 5 weeks). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. RubySketch sells 1 one-off in-app purchase and App大学 (旧Flutter大学) sells 5 in-app purchases, starting at $19.99 per month. Whichever you choose, the download price is not the number that matters.

RubySketch ships an update every 5 weeks, App大学 (旧Flutter大学) every 9 days. The most recent releases landed on September 21, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | RubySketch | App大学 (旧Flutter大学) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (24 ratings)](https://appshunter.io/ios/app/rubysketch-graphics-and-games/id1491477639/reviews)** | — |
| Number of ratings | **24** | — |
| Positive reviews | **100.0% of reviews** | 33.3% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Every 9 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 82 MB | 123 MB |
| Requires iOS | 16.0 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Noritaka Suzuki](https://appshunter.io/developer/1491477638) | [KBOY, LLC.](https://appshunter.io/developer/1121544040) |

## What reviewers say

### RubySketch

[App page](https://appshunter.io/ios/app/rubysketch-graphics-and-games/id1491477639)

This app provides a Ruby interpreter and text editor, allowing users to write and run Ruby scripts. It also features a graphics API compatible with Processing for creative coding on mobile devices.

**Highlights:** Built-in Ruby interpreter (CRuby/MRI), Processing-compatible graphics API, Text editor with easy cursor movement, Physics-capable sprites, Image input from camera, Sound playback, Sample scripts and games

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $9.99 | one-time |


### App大学 (旧Flutter大学)

[App page](https://appshunter.io/ios/app/app-flutter/id1532391360)

This app offers a specialized learning community for mobile app development. It provides various learning plans and community features to help users master app creation.

**Highlights:** Mobile app development focus, Learning community, Specialized learning plans, Community features

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| コミュニティプラン | $19.99 | per month |
| 課題学習プラン | $39.99 | per month |
| AI修行プラン | $69.99 | per month |
| ライト修行プラン | $79.99 | per month |
| Flutter修行プラン | $99.99 | per month |


## Frequently asked questions

### Is RubySketch free?

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

### Is App大学 (旧Flutter大学) free?

App大学 (旧Flutter大学) is free to download, with in-app purchases available.

### Do RubySketch or App大学 (旧Flutter大学) have ads?

RubySketch shows ads; App大学 (旧Flutter大学) does not.

### Which is updated more often, RubySketch or App大学 (旧Flutter大学)?

RubySketch ships an update every 5 weeks, and App大学 (旧Flutter大学) every 9 days. Most recently, RubySketch was updated on September 21, 2026 and App大学 (旧Flutter大学) on September 11, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*