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thaddy/kol4

Analysis updated 2026-05-18

17PascalAudience · developer

TLDR

A Windows GUI framework for Object Pascal that produces smaller executables than the standard VCL or LCL frameworks.

Mindmap

mindmap
  root((repo))
    What it does
      Windows GUI framework
      Smaller executables
      Object Pascal
    Tech stack
      Pascal
      Delphi
      FreePascal
    Use cases
      Small utilities
      Replace VCL LCL
      Continue old kol.pas
    Audience
      Pascal developers
    History
      Fork of kol.pas
      Version 4.00RC
      Included demos

Code map

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What do people build with it?

USE CASE 1

Build small Windows utility programs with a smaller executable file size.

USE CASE 2

Write Object Pascal GUI applications without using the standard VCL or LCL frameworks.

USE CASE 3

Port or continue development on projects originally built with the older kol.pas library.

USE CASE 4

Learn from included demo programs how to structure a Kol-based Windows application.

What is it built with?

PascalDelphiFreePascal

How does it compare?

thaddy/kol4amancini/delphicolorpreviewconung-vic/oneagent-sdk-delphi
Stars171915
LanguagePascalPascalPascal
Setup difficultyeasyeasy
Complexity2/52/5
Audiencedeveloperdeveloperdeveloper

Figures from each repo's GitHub metadata at analysis time.

In plain English

Kol4 is a framework for writing Windows programs in Object Pascal, the language used by Delphi and FreePascal. It is a continuation of an older project called kol.pas, originally created by Vladimir Kladov, and it works with both the FreePascal and Delphi compilers on 32-bit and 64-bit Windows machines running Intel or AMD processors. The main idea behind Kol is that it replaces the more common VCL or LCL frameworks that Delphi and FreePascal developers usually rely on for building the visual parts of an application. The author explains that the two approaches should not be mixed. The benefit of using Kol instead is that the finished Windows programs come out much smaller in file size, while developers can still write in an object-oriented style rather than calling the raw Windows API directly. The README argues this is still worth caring about today, especially for small utilities, even though storage space is generally cheap now. The author describes this project as both a fork and not quite a fork of the original Kol library. They explain they had contributed to Kol for many years and worked closely with its original creator, and took over the project because it was at risk of being abandoned and disappearing, which they felt would be a loss for the Object Pascal community. The repository includes a few demo programs, with more planned, and points to additional sample programs hosted on the site torry.net. A short version history in the README shows the project's early commits, starting from an initial version based on an older 3.23.4 release, along with early changes such as removing old assembler code and renaming the version to an early 4.00 release candidate.

Copy-paste prompts

Prompt 1
Help me set up Kol4 with FreePascal to build a small Windows utility.
Prompt 2
Explain the difference between Kol4 and the standard VCL or LCL frameworks in Delphi.
Prompt 3
Walk me through one of Kol4's included demo programs to understand its structure.
Prompt 4
How do I migrate an old kol.pas project to Kol4?

Frequently asked questions

What is kol4?

A Windows GUI framework for Object Pascal that produces smaller executables than the standard VCL or LCL frameworks.

What language is kol4 written in?

Mainly Pascal. The stack also includes Pascal, Delphi, FreePascal.

Who is kol4 for?

Mainly developer.

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