Adaptivity is an invaluable app for iOS developers and designers. It has tools to visualise size classes, layout margins, dynamic type sizes, system colors and much more. Version 8.4 improves the system images view:

• Create your own collections of symbols.
• Support for new symbols added in iOS/iPadOS 15.2 and macOS 12.1.

If you are an iOS developer, I'm sure you will find Adaptivity very helpful. Don't just take my word for it:

• “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.

The app is a universal purchase and includes a Mac Catalyst version.