I'm not sure what you have in mind, Lazarus (and AFAIK Delphi at least since version 7, most likely earlier too) saves the form as a text file which you can dif

I'm not sure what you have in mind, Lazarus (and AFAIK Delphi at least since version 7, most likely earlier too) saves the form as a text file which you can diff and i do that all the time when looking at changes in my code before submitting them. In fact the format is very readable and has a syntax like: object ScriptConsole: TScriptConsole Left = 349 Height = 331 Top = 710 Width = 487 ... object Cmd: TEdit Align = alBottom end ... end (this is part of the code from a form of a project of mine called ScriptConsole) It only stores properties changed from their defaults which makes for very compact files and focusing on the stuff you have actually worked on. If anything i find the XML files that other tools (like Qt Designer and wxFormBuilder) use harder to read.