Comparison

Adaptivity (A) vs RETRO FORTH

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Adaptivity (A)

Visualize how app layouts adapt to different screen sizes, orientations, and dynamic text settings on iOS and iPadOS devices. Explore SF Symbols, system colors, fonts, and materials with detailed information and previews.

Highlights
  • Visualize layout sizes and margins
  • Explore SF Symbols across iOS versions
  • Preview Dynamic Type styles
  • View System Colors, Fonts, and Materials
  • Support for iPad multitasking and external displays
  • Widget and Siri shortcut integration
Features
Read full description

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, iPad multitasking and Dynamic Type size changes. A comprehensive System Images browser shows the different SF Symbols data sets across iOS versions with availability, localization and name change information. There are also views for visualizing Dynamic Type styles, System Colors, System Fonts and System Materials. 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 • 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 support for sharing a snapshot image of each view. • iPad multitasking and multiple window support (see note). • Dark appearance support (requires iOS/iPadOS 13 or later). • Setting to force right-to-left layout. • Keyboard shortcuts. • Keyboard navigation (requires iPadOS 15 or later). • Handoff actions from Adaptivity (A), (B) or (C) on one device to Adaptivity (A) on another. • External display support. OTHER VIEWS • Popover, Form/Page Sheet, Full Screen and Automatic modal presentations. • Customise Sheet Presentations on iOS/iPadOS 15 or later. • Tab Bar Controller. • Table View Controller. • Classic style Split View Controller. • Double and triple column style Split View Controllers (requires iOS/iPadOS 14 or later). • Keyboard Dodging and Custom Keyboard. • Dynamic Type styles for the current Content Size Category. • Explore Pointer Interactions (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). EXTENSION TARGETS • Siri shortcut with custom response UI (requires iOS 12 or later). • 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 (requires watchOS 4 or later). • iMessage App. Note: Adaptivity (A) supports multiple windows on iPadOS 13 or later. On earlier iOS versions, Adaptivity (B) must also be downloaded to run Adaptivity twice using Split View or Slide Over 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

About

RETRO FORTH

A compact and adaptable concatenative programming language designed for ease of learning and customization. It features a code editor, interactive listener, and support for Gopher servers, allowing for flexible development.

Highlights
  • Concatenative programming language
  • Code editor with Markdown subset
  • Literate programming style
  • Interactive listener interface
  • Gopher server data fetching
  • File manager
  • Documentation browser
Features
Read full description

RETRO FORTH is a concatenative programming language with roots in Forth. Designed to be compact, learnable, and easy to adapt to specific needs, it has been developed and refined through continual use by a small community over more than a decade. Forth is a stack based programming language created in the late 1960's by Chuck Moore. Over the intervening decades it has evolved through use, with many dialects along the way. The Retro dialect was created in the late 1990's, and has been continually developed and supported for over 15 years. It is a structured, imperative stack-based language with modern facilities including quotations and reflection. It features: - latest version of the RETRO language - a code editor using Markdown subset - literate programming style - code is extracted from fenced blocks in Markdown source allowing easy mixing of code and commentary - allows use of unicode & emoji in source & commentary - interactive listener interface for quick interactions - simple console output and text input - editor provides quick access to numbers and symbols - support for fetching textual data from Gopher servers - file manager - documentation browser It also includes documentation and several optional examples.

Screenshots

Adaptivity (A)4 screens
RETRO FORTH4 screens

Verdict

The call

The clearest difference is review sentiment: Adaptivity (A) at 94% against RETRO FORTH's 33%. Adaptivity (A) also leads on rating (5.0 vs 4.4) and ratings volume (92 vs 5). RETRO FORTH's advantage is price (Free vs $7.99) and in-app purchases (none vs 4). On update cadence, ads 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

CostPrice · In-app purchases · Ads · Monetization

RETRO FORTH is free to download; Adaptivity (A) costs $7.99 up front. Adaptivity (A) sells 4 one-off in-app purchases. RETRO FORTH asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Adaptivity (A) holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Adaptivity (A) has 92 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 94% of Adaptivity (A)'s written reviews are positive against 33% of RETRO FORTH's.

UpkeepUpdate frequency

Adaptivity (A) ships an update every 3 weeks, RETRO FORTH monthly. The most recent releases landed on September 25, 2026 and September 6, 2026 respectively.

Scorecard8 real differences · 3 level
Adaptivity (A) versus RETRO FORTH: the parameters behind the verdict, then further details
ParameterAdaptivity (A)RETRO FORTH
Price$7.99Free — better
Rating5.0 (92 ratings) — better4.4 (5 ratings)
Positive reviews94.3% of reviews — better33.3% of reviews
Number of ratings92 — better5
Update frequencyEvery 3 weeks — betterMonthly
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
Best chart rank#70 — better—
DevicesiPhone, iPad, iPod, Mac, Apple Watch — betteriPhone, iPad, iPod
Requires iOS11.0 — better12.4
Further details — not scored
Size46 MB4 MB
Age rating4+4+
DeveloperGeoff HackworthCharles Childers

Customer experience

Adaptivity (A)

All ratings92 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews35 reviews
Positive94.3%
Neutral2.9%
Negative2.9%

RETRO FORTH

All ratings5 ratings
Positive80.0%
Neutral20.0%
Negative0.0%
Written reviews3 reviews
Positive33.3%
Neutral66.7%
Negative0.0%

In-app purchases

4 purchases

Adaptivity (A)

One-time4
  • Small Tip$0.99
  • Medium Tip$1.99
  • Large Tip$4.99
Show 1 more
  • Enormous Tip$9.99
None

RETRO FORTH

No in-app purchases

Questions

Is Adaptivity (A) free?
Adaptivity (A) costs $7.99, and also offers in-app purchases.
Is RETRO FORTH free?
RETRO FORTH is free to download, with no in-app purchases.
Which has better reviews, Adaptivity (A) or RETRO FORTH?
Adaptivity (A) is rated higher. Adaptivity (A) averages 5.0 out of 5 from 92 ratings, while RETRO FORTH averages 4.4 from 5 ratings.
Do Adaptivity (A) or RETRO FORTH have ads?
Neither Adaptivity (A) nor RETRO FORTH shows ads.
Which is updated more often, Adaptivity (A) or RETRO FORTH?
Adaptivity (A) ships an update every 3 weeks, and RETRO FORTH monthly. Most recently, Adaptivity (A) was updated on September 25, 2026 and RETRO FORTH on September 6, 2026.

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