Adaptivity (C) vs Rubyist
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Adaptivity (C)
Visualize layout elements like Size Classes, margins, and safe areas on devices. See how these adapt to orientation and Dynamic Type changes. This free version offers core features for developers and designers.
- Visualize Size Classes and margins
- Adapt to orientation and Dynamic Type
- View layout on real devices
- Toggle status bar and navigation bar
- Share snapshot images
- Dark appearance support
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Adaptivity is an invaluable tool for developers and designers. Use it to visualize how Size Classes and margins for layout, readable content and the safe area look on real devices and how they change with respect to orientation and Dynamic Type size changes. This free version has reduced features. TESTIMONIALS • “Adaptivity is not just highly recommended – it’s essential” — Paul Hudson, Hacking With Swift article “8 essential apps for iOS developers”, 30th March 2020. • “It's a very, very good tool as a reference for both developers and designers” — Gui Rambo, Stacktrace podcast episode #77, 1st April 2020. • “I'm not trying to spend your money, but to me this is a no-brainer” — Sean Allen YouTube video “Indie Dev Apps”, 12th April 2020. MAIN FEATURES • Only supports iPhone to visualize how an iPhone‑only app appears on iPad. • Visualize sizes for full view, layout margins, readable content guide and safe area layout guide. • Sizes displayed in points or pixels. • Regular or large navigation bar titles. • Toggle status bar and navigation bar/toolbar/tab bar visibility. • Activity View Controller for sharing a snapshot image of each view. • Dark appearance support (requires iOS/iPadOS 13 or later). • Setting to force right-to-left layout. • Handoff actions from Adaptivity (C) on one device to Adaptivity (A) on another. OTHER VIEWS • Popover, Form/Page Sheet, Full Screen and Automatic modal presentations. • Customise Sheet Presentations on iOS/iPadOS 15 or later. • Tab Bar Controller • Class style Split View Controller. • Dynamic Type styles for the current Content Size Category. The full version of the app, Adaptivity (A), includes many more features: • Table View Controller. • Double and triple column style Split View Controllers (requires iOS/iPadOS 14 or later). • Keyboard Dodging and Custom Keyboard. • Safe Area Layout Guide. • Explore Pointer Interaction (requires iPadOS 13.4 or later and a trackpad or mouse). • Explore System Colors. • Explore System Fonts. • Explore System Images (requires iOS/iPadOS 13 or later). Choose which SF Symbols data set to view, configure rendering modes and much more. • Explore System Materials (requires iOS/iPadOS 13 or later). • Keyboard shortcuts. • Keyboard navigation (requires iPadOS 15 or later). • Home Screen Quick Actions (requires iOS/iPadOS 13 or later). • Siri shortcut with custom response UI. • Handoff support. • External display support. • Pre- and post-iOS 14 style Widgets to show layout. • iOS 14 style Widgets to show random System Images. • iOS 14 style Widgets to show Dynamic Type text styles. • iOS 16 lock screen Widgets to show layout. • iOS 16 lock screen Widgets to show random System Images. • Notification Content Extension. • Watch App. • iMessage App. Note: Adaptivity (A) supports multiple windows on iPadOS 13 or later. On earlier iOS versions, Adaptivity (A) and (B) must be downloaded to run Adaptivity twice using iPad multitasking. Adaptivity (A) is a universal purchase and includes a Mac Catalyst version of the app. Buying one allows the other to be downloaded at no extra cost using the same Apple ID. Adaptivity (C) has the same reduced features as Adaptivity (B) but only supports iPhone. Use it to visualize how an iPhone‑only app appears on iPad. For more information see https://hacknicity.com/adaptivity
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
Screenshots
Verdict
The clearest difference is in-app purchases: Adaptivity (C) at none against Rubyist's 3. Adaptivity (C) also leads on rating (5.0 vs 4.6) and review sentiment (100% vs 83%). Rubyist's advantage is ratings volume (93 vs 4) and update cadence (every 3 weeks vs every 2 months). On price, ads and device support 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
Both are free to download. Rubyist sells 3 one-off in-app purchases. Adaptivity (C) asks for nothing beyond the download.
Adaptivity (C) holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Rubyist has 93 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 100% of Adaptivity (C)'s written reviews are positive against 83% of Rubyist's.
Adaptivity (C) ships an update every 2 months, Rubyist every 3 weeks. The most recent releases landed on September 22, 2026 and October 7, 2026 respectively.
| Parameter | Adaptivity (C) | Rubyist |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | 4.6 (93 ratings) |
| Positive reviews | 100.0% of reviews — better | 83.3% of reviews |
| Number of ratings | 4 | 93 — better |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 11.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 12 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | Geoff Hackworth | TSUBASA TECHNOLOGIES LIMITED LIABILITY COMPANY |
Customer experience
Adaptivity (C)
Rubyist
In-app purchases
Adaptivity (C)
No in-app purchases
Rubyist
- Small Tip$0.99
- Medium Tip$4.99
- Large Tip$9.99









