adw-gtk3-theme1.0

It gives GTK3 applications the visual language of libadwaita, bringing a modern GNOME-style appearance to programs that do not use GTK4 or libadwaita directly. adw-gtk3-theme is an unofficial GTK3 port distributed as a snap, allowing the theme to work through the desktop’s GTK theme support without changing application behavior. The system-tools software is published by Kim MJ and ported by YuniChans (i5-9500f), with broader adw-gtk3 development associated with lassekongo83.

Users can select it for legacy applications with GNOME Tweaks under Appearance > Legacy Applications, while GNOME Control Center’s Appearance section handles dark-theme selection; gsettings provides another way to switch themes. GTK named colors support further customization, and the related adw-colors project provides guidance for those adjustments. The accent-color-changer command-line program can change accent colors for most applications on GNOME 47 and later.

Flatpak applications do not receive the styling automatically: the Flathub theme option does not work with non-libadwaita GTK4 apps, while a Flatpak override works with them when the theme is placed in ~/.local/share/themes. Snap applications use only themes supplied by a theme Snap, and this package exposes its GTK 3 theme through the gtk-common-themes integration. If a dark theme is not applied to some GTK4 applications, adding the relevant settings to ~/.config/gtk-4.0/settings.ini is supported.

It runs on Linux with snapd on x86_64 (amd64) systems, and the current version is 1.0 under an open-source license. Because GTK3 cannot reproduce every libadwaita behavior, the port does not promise a 100% visual match; it suits GNOME users who want a consistent look across legacy GTK3 programs. Contributors can participate in the upstream project through GitHub with an account, and the project also points to wallpapers and customization examples such as Peninsula-dark.