# Processing & p5.js iCompiler vs RubySketch

The clearest difference is rating: RubySketch at 4.7 against Processing & p5.js iCompiler's 3.5. RubySketch also leads on review sentiment (100% vs 58%). Processing & p5.js iCompiler's advantage is ads (none vs shown) and chart position (#127 vs unranked). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. Processing & p5.js iCompiler sells 5 in-app purchases, starting at $3.49 per month and RubySketch sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

RubySketch holds the better App Store score, 4.7 against 3.5. Both are backed by a comparable volume of ratings — 80 and 24 respectively. Written reviews point the same way: 58% of Processing & p5.js iCompiler's written reviews are positive against 100% of RubySketch's.

Processing & p5.js iCompiler ships an update every 2 months, RubySketch every 5 weeks. The most recent releases landed on October 16, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Processing & p5.js iCompiler | RubySketch |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (80 ratings)](https://appshunter.io/ios/app/processing-and-p5js-icompiler/id648955851/reviews) | **[4.7 (24 ratings)](https://appshunter.io/ios/app/rubysketch-graphics-and-games/id1491477639/reviews)** |
| Number of ratings | **80** | 24 |
| Positive reviews | 58.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | Freemium | Free with in-app purchases |
| Best chart rank | **#127** | — |
| Size | 10 MB | 82 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [riedel.wtf apps S.L.](https://appshunter.io/developer/517545753) | [Noritaka Suzuki](https://appshunter.io/developer/1491477638) |

## What reviewers say

### Processing & p5.js iCompiler

[App page](https://appshunter.io/ios/app/processing-and-p5js-icompiler/id648955851)

**Currently charting:** #127 Top Grossing · Developer Tools (US App Store)

Develop and compile Processing and p5.js code directly on your mobile device. Export your creations as standalone apps for offline use. Ideal for students and educators learning creative coding.

**Highlights:** Compose and compile code on mobile, Export projects as home screen apps, Offline app usage, Code highlighting and formatting, 3D sketches and games support, Error highlighting (Pro feature)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Processing Pro (Monthly) | $3.49 | per month |
| Processing Pro (Annual) | $9.99 | per year |
| Processing for iOS Tip | $4.99 | one-time |
| Processing Pro Lifetime Unlock | $25.99 | one-time |
| Processing for iOS Tip | $99.99 | one-time |

**What reviewers like**

- ✅ Works offline without internet connection
- 👍 Free app with no mandatory payment
- 🎨 Good for quick creative coding and sketches
- 📱 Portable Processing development on mobile
- ⚡ Relatively fast performance for mobile IDE

**What reviewers complain about**

- 🚫 Compiler errors hidden behind paywall
- 🐛 Data loss and code deletion issues
- ❌ No error messages or debugging output
- 📝 Poor syntax highlighting (highlights wrong keywords)
- ⌨️ No auto-indentation or code formatting

**Reported bugs**

- Code reverts to earlier versions after app sleep
- Changes lost when phone falls asleep
- Functions with parameters cause black screen
- StringList data type not recognized
- Boolean highlighting shows 'bool' instead of full word

**Requested features**

- Free basic error messages for all users
- Undo/redo functionality
- Project renaming capability
- Project duplication feature
- Robust auto-save and backup system


### 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 |


## Frequently asked questions

### Is Processing & p5.js iCompiler free?

Processing & p5.js iCompiler is free to download, with in-app purchases available.

### Is RubySketch free?

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

### Which has better reviews, Processing & p5.js iCompiler or RubySketch?

RubySketch is rated higher. Processing & p5.js iCompiler averages 3.5 out of 5 from 80 ratings, while RubySketch averages 4.7 from 24 ratings.

### Do Processing & p5.js iCompiler or RubySketch have ads?

RubySketch shows ads; Processing & p5.js iCompiler does not.

### Which is updated more often, Processing & p5.js iCompiler or RubySketch?

Processing & p5.js iCompiler ships an update every 2 months, and RubySketch every 5 weeks. Most recently, Processing & p5.js iCompiler was updated on October 16, 2026 and RubySketch on October 8, 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.*