Free
Free
FLTK is provided under the GNU Library Public License Version 2 with exceptions allowing static linking.
- Access
- FLTK is provided under the GNU Library Public License Version 2 with exceptions allowing static linking.
FLTK
● Identity checkedCode · Vendor site 2026-10-04
The Fast Light Toolkit (FLTK) is a cross-platform C++ GUI library for Linux, Windows, and macOS with OpenGL support and a companion UI builder called FLUID. It targets lightweight native apps that can be linked statically or as a shared library.
- Category
- Code
- Free access
- FLTK is provided under the GNU Library Public License Version 2 with exceptions allowing static linking.
- API access
- Not confirmed
Is FLTK right for you?
A good fit for
C++ developers building desktop utilities or scientific tools who want a compact GUI toolkit without heavy dependencies.
Before you choose
Latest stable releases and snapshots are published on fltk.org; there is no commercial SaaS tier on the project homepage.
Lightweight C++ GUI toolkit
FLTK bundles widgets, OpenGL integration, and FLUID so developers can ship small native GUI apps across major desktop operating systems.
What it can do
Features & capabilities
Unknown is different from unavailable. Each fact carries its own evidence.
| Capability | Value | Evidence | Checked |
|---|---|---|---|
| Platforms | Homepage states FLTK supports UNIX/Linux, Microsoft Windows, and macOS with X11 and Wayland on Linux. | Facts sourced | 2026-10-04 |
| Latest release | Site quick info lists FLTK 1.4.5 as the latest stable release with downloadable artifacts. | Facts sourced | 2026-10-04 |
| UI builder | FLTK includes FLUID, a UI builder for creating applications quickly. | Facts sourced | 2026-10-04 |
Understand the total cost
FLTK pricing & plans
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Frequently asked questions
What is FLTK used for?
The Fast Light Toolkit (FLTK) is a cross-platform C++ GUI library for Linux, Windows, and macOS with OpenGL support and a companion UI builder called FLUID. It targets lightweight native apps that can be linked statically or as a shared library.
Does FLTK have a free plan?
FLTK is provided under the GNU Library Public License Version 2 with exceptions allowing static linking.. This record lists ongoing free access; check the plan limits before starting.
How much does FLTK cost?
No paid monthly price is listed; this record treats the product as free to start. See the plan cards for entitlements, billing commitments and seat minimums.
Can I use FLTK through an API?
Not confirmed. API access and subscription access may have different terms; consult the linked sources.
What should I check before choosing it?
Latest stable releases and snapshots are published on fltk.org; there is no commercial SaaS tier on the project homepage.
Price history
No retained pricing changes yet. A current price alone does not establish a historical trend.
How this profile is supported
Identity and profile
Reviewed vendor source
Read original source ↗Facts apply to the named version and check date. Send a sourced correction if something changed.