When comparing Lazarus vs Flutter, the Slant community recommends Lazarus for most people. In the question“What are the best tools for making a cross-platform application?” Lazarus is ranked 2nd while Flutter is ranked 3rd.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Free alternative to Delphi.
Pro Open source
Pro Great developer tools debug/hotreload/analyser
Pro Based on Dart language
Dart is a Java like language, easy to learn and startup fast for millions of Java developers.
Pro A single codebase for iOS AND Android
Pro Fast
The developer's goal is to allow people to make apps running at 120 FPS.
Cons
Con Not actually delphi
It's close,. looks and feels the same. But not actually Delphi.
Con Buggy
Has some "weird" bugs according to some.
Con Still in development
According to the website, Flutter is still in its early stages of development.
Con Based on Dart language
Dart is a Java like language, easy to learn and startup fast for millions of Java developers. BUT if you have to learn it ... it's a con.
Con Dart is unpopular and never gained serious community traction like Kotlin or Java
Con Does not support 32-bit iOS devices
If you plan on targeting iPhone 5, 5C or earlier, you can forget about Flutter.