gtkmm

At a glance

• Editor score
  7.1 / 10
• Pricing
  Free plan
• Best for
  C++ developers already using GTK
• Free plan
  Yes
• Paid from
  Free
• UI stack
  Native
• Facts checked
  23 Oct 2026

• Where it wins

  • Adds type-safe signal handlers and callbacks to GTK development.
  • Supports custom widgets through inheritance and Standard C++ Library types.
  • Free under the LGPL, with Meson and Autoconf integration.

• Where it doesn't

  • Requires GTK, so it is a focused choice rather than a general C++ framework.
  • Community and documentation are the listed support channels.
  • Does not target mobile development.

Our verdict on gtkmm

gtkmm is the official C++ interface for GTK, the GUI library, for developers building GTK applications in C++. It brings GTK widgets into C++ projects and adds language-oriented features such as type-safe signal handlers, inheritance, and use of Standard C++ Library strings, containers, and iterators. The project is open source and free under the LGPL for use in open-source and proprietary projects. Its scope is a good fit for C++ developers who have chosen GTK; it is less suited to teams seeking a framework independent of GTK or one aimed at mobile targets.

The main distinction is how gtkmm maps GTK work into C++: callbacks are type-safe, custom widgets can be created through inheritance, and widget memory management uses C++ conventions. It also supports UTF-8 internationalization. These capabilities make it relevant where an application needs GTK's widget library while its implementation is in C++, rather than a broad cross-framework toolkit. GTK and libsigc++ are its listed integrations, so its ecosystem fit is centered on GTK rather than a wide range of unrelated platforms.

Build-system integration includes Meson and Autoconf, and the project provides reference documentation and tutorials. Support channels are community and documentation; commercial support is available from listed third-party developers and companies, not through a published gtkmm vendor support plan. Choose gtkmm when a team wants to build GTK applications in C++ and values its callback and widget model. Consider an alternative if the project requires a framework that does not depend on GTK, or a mobile development target.

Your product? Our editors can test gtkmm in depth and publish a review, labelled as paid · from $149/mo →

gtkmm pricing

gtkmm fact sheet

gtkmm integrations

gtkmm lists 2 integrations on its own site.

• GTK
• libsigc++

Alternatives to gtkmm

• FlutterAn open-source Dart framework for building cross-platform apps from shared UI code.9.3
• EElectronAn open-source framework for building desktop apps from a shared JavaScript codebase.9.1
• .NET MAUI.NET MAUI shares C# and XAML development across native mobile and desktop apps.9.0

See all gtkmm alternatives →

Featured on iTechGuides

gtkmm is listed in our Desktop App Development Frameworks directory. Add the badge to your site — it links back to this page.

<a href="https://www.itechguides.com/products/gtkmm/"><img src="https://www.itechguides.com/best/badge/gtkmm.svg" alt="Featured on iTechGuides" width="230" height="46"></a>

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Last updated 30 Oct 2026 · How we research and update