Rubyist vs Cown Zoo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Rubyist
Execute and automate Ruby scripts directly on your iPhone and iPad. This app utilizes the MRuby VM to run code, integrate with Shortcuts and Siri, and offers a robust editor with syntax highlighting and autocomplete.
- Run Ruby code on device
- Editor with syntax highlighting
- Code autocomplete
- Shortcuts app integration
- Siri command creation
- Native alerts and inputs
- HTTP requests
- Clipboard access
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Rubyist allows you to run Ruby code on your iPhone and iPad using the MRuby VM. Run code directly in the app or via the Shortcuts app or Siri commands. Features: - Run Ruby code directly on your device - Built-in documentation viewer - Editor with ruby syntax highlighting - Code Autocomplete - Run Ruby directly in Shortcuts - Build your own Siri commands in Ruby. - Display native alerts and inputs using exclusive APIs - Make http requests from your code. - Write and read your clipboard from code
Cown Zoo
Enhance your mobile web browsing experience by creating, editing, and injecting custom scripts and stylesheets into any webpage within Safari. This app offers a mobile-native interface for simplified script management.
- Create custom scripts
- Edit user scripts
- Inject CSS to webpages
- Mobile-native interface
- GreaseMonkey script support
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Cown Zoo is an app that allows you to create, edit and inject scripts into any webpage on Safari. It's designed to be mobile-native as to simplify the usage and creation of user scripts and stylesheets on mobile devices. - Add your own JavaScript or CSS to any webpage - Edit script & CSS right in app - (Partial) support for GreaseMonkey scripts
Screenshots
Verdict
The clearest difference is price: Rubyist at Free against Cown Zoo's $1.99. Rubyist also leads on rating (4.6 vs 2.0) and review sentiment (83% vs 50%). Cown Zoo's advantage is in-app purchases (none vs 3) and chart position (#150 vs unranked). On ads, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Rubyist is free to download; Cown Zoo costs $1.99 up front. Rubyist sells 3 one-off in-app purchases. Cown Zoo asks for nothing beyond the download.
Rubyist holds the better App Store score, 4.6 against 2.0. That said, the two scores are not equally well evidenced: Rubyist has 93 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 83% of Rubyist's written reviews are positive against 50% of Cown Zoo's.
Rubyist ships an update every 3 weeks, Cown Zoo every 3 months. The most recent releases landed on September 24, 2026 and September 19, 2026 respectively.
| Parameter | Rubyist | Cown Zoo |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 4.6 (93 ratings) — better | 2.0 (3 ratings) |
| Positive reviews | 83.3% of reviews — better | 50.0% of reviews |
| Number of ratings | 93 — better | 3 |
| Update frequency | Every 3 weeks — better | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Best chart rank | — | #150 — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 26 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | TSUBASA TECHNOLOGIES LIMITED LIABILITY COMPANY | Inkwire Tech Hangzhou Co., Ltd. |
Customer experience
Rubyist
Cown Zoo
In-app purchases
Rubyist
- Small Tip$0.99
- Medium Tip$4.99
- Large Tip$9.99
Cown Zoo
No in-app purchases
