GUI toolkit for LV2 plugins
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ZToolkit status

ZToolkit (Ztk) is a cross-platform GUI toolkit heavily inspired by GTK.

It handles events and low level drawing on behalf of the user and provides a high-level API for managing the UI and custom widgets.

ZToolkit is written in C based on pugl and was created to be used for various plugins bundled with the Zrythm digital audio workstation.


Required: Cairo and X11

Optional: Librsvg (for SVG support)


meson build -Denable_rsvg=true
ninja -C build
ninja -C build install


ZToolkit will install a static library that can be linked to. All of the API is exposed in a single header for convenience.

#include <ztoolkit/ztk.h>

Docs are coming soon.


ZLFO - a fully featured LFO for CV-based automation


ZToolkit is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

ZToolkit is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

The full text of the license can be found in the COPYING file.

For the copyright years, ZToolkit uses a range (“2008-2010”) instead of listing individual years (“2008, 2009, 2010”) if and only if every year in the range, inclusive, is a “copyrightable” year that would be listed individually.

Some files, where specified, are licensed under different licenses.

Copyright (C) 2020 Alexandros Theodotou

Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved. This file is offered as-is, without any warranty.