Fast Light Toolkit - Fast Light Toolkit (FLTK)

Latest Release:	Download 1.4.3
Release Notes:	View 1.4.3
Weekly Snapshot:	1.5.x-20250613-3d13dfefa9d5
Developer Roadmap:	View Roadmap
Commit Activity: (updated every 15 min.)	View Graph

Old Stable Release:	Download 1.3.11
Release Notes:	View 1.3.11

FLTK is a cross-platform C++ GUI toolkit for UNIX^®/Linux^® (X11 and Wayland), Microsoft^® Windows^®, and macOS^®. FLTK provides modern GUI functionality without the bloat and supports 3D graphics via OpenGL^® and its built-in GLUT emulation.

FLTK is designed to be small and modular enough to be statically linked, but works fine as a shared library. FLTK also includes an excellent UI builder called FLUID that can be used to create applications in minutes.

FLTK is provided under the terms of the GNU Library Public License, Version 2 with exceptions that allow for static linking.

	Current Poll [ Show All ]
	Note: This poll is closed. Do you need / use the "FLTK Apps" and "Links" tabs on the FLTK website? We may want to close these parts if users don't want or need them. You may pick more than one answer. (please pick all that apply) Yes, I'm often looking for interesting FLTK apps. Yes, please keep, but I don't use them frequently. No, I don't really need these apps and links pages. No, I never use them, please remove. I use FLTK Apps but not Links. I use Links but not FLTK Apps. I used them when I was new to FLTK. I believe they are important for new users. I like them, but they should be better accessible. I abstain. [ Results ] (442 votes, 5 comments)

	Top 10 Links [ Show All ]
	CED - Cryptoeditor 01
	BC-DeciCalc 3.2.2
	flvw [Stale home link 2023-11-11]
	SpiritVNC - FLTK 0.6.5
	AIM-UC 1.6.10
	Examples FLTK 1.0.1
	[Stale links 2023-11-11] fl_connect 1.5
	[Stale links 2023-11-11] FLU 2.14
	SPTK 4.00
	[Stale home link 2023-11-11] TableBox 0.9.x

Site News

Dec 01, 2018: The FLTK Team is proud to announce that we moved our source code repository to Git and the FLTK website to a new server. Please see article FLTK Moved to Git and to a new Server.

May 2013: Back in April 2013 we had to move the fltk.general and fltk.coredev lists to Google Groups. Please join us there to reconnect. All postings from today on back through 2004 are available on the FLTK Forums page.

Sticky Articles

Git for FLTK Users Sticky

08:19 Jun 14, 2021 by AlbrechtS, 4 comments
How to use Git for downloading and using FLTK. [ Read ]

Git for FLTK Developers Sticky

06:24 Feb 11, 2019 by AlbrechtS, 0 comments
How to use Git as a FLTK developer to push your changes to the FLTK Git repository - work in progress... [ Read ]

What are the Versions of FLTK? Sticky

09:02 Apr 29, 2025 by engelsman, 3 comments
April 29, 2025: updated for FLTK 1.4.3 and 1.5
There is a lot of confusion, especially for people who are new to FLTK, about the different FLTK versions, what they offer, and when they will be released. This article attempts to clarify matters. [ Read ]

Recent Articles [ Show All Articles ]

FLTK 1.5.x Weekly Snapshot (master)
00:05 Jun 13, 2025 by WebsiteCron, 0 comments
A new weekly snapshot of FLTK 1.5.x (master) is now available [ Read ]

FLTK 1.4.3 released on April 29, 2025
06:07 Apr 29, 2025 by AlbrechtS, 0 comments
FLTK 1.4.3 is a maintenance release with bug fixes and improvements. [ Read ]

FLTK 1.4.2 released on Feb. 23, 2025
10:29 Feb 23, 2025 by AlbrechtS, 0 comments
FLTK 1.4.2 is a maintenance release with bug fixes and improvements. [ Read ]

FLTK 1.3.11 released on Feb. 05, 2025
05:40 Feb 06, 2025 by AlbrechtS, 0 comments
FLTK 1.3.11 is a maintenance release with bug fixes and some improvements. [ Read ]

FLTK 1.4.1 released on Dec. 12, 2024
11:09 Dec 12, 2024 by AlbrechtS, 0 comments
FLTK 1.4.1 is a maintenance release with bug fixes and improvements. [ Read ]

FLTK 1.4.0-1 released on Nov. 18, 2024
18:18 Nov 17, 2024 by AlbrechtS, 0 comments
FLTK 1.4.0 is a new release with major improvements. FLTK 1.4.0-1 is a minor update. [ Read ]

FLTK 1.3.10 released on Nov. 16, 2024
10:09 Nov 16, 2024 by AlbrechtS, 0 comments
FLTK 1.3.10 is a maintenance release with minor enhancements and some macOS and CMake related improvements. [ Read ]

FLTK 1.4.0rc3 released on Nov. 08, 2024
09:18 Nov 08, 2024 by AlbrechtS, 0 comments
FLTK 1.4.0rc3 is the third release candidate of a new release with major improvements. [ Read ]

FLTK 1.4.0rc2 released on Oct. 27, 2024
08:41 Oct 27, 2024 by AlbrechtS, 0 comments
FLTK 1.4.0rc2 is the second release candidate of a new release with major improvements. [ Read ]

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