When comparing GraphicsGale vs PixiEditor, the Slant community recommends GraphicsGale for most people. In the question“What are the best pixel art / sprite editors?” GraphicsGale is ranked 5th while PixiEditor is ranked 17th. The most important reason people chose GraphicsGale is:
The animation tools in GraphicsGale are very easy to work with. Furthermore, the live preview helps clean up the animations in real time without a hitch.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Powerful animation tools
The animation tools in GraphicsGale are very easy to work with. Furthermore, the live preview helps clean up the animations in real time without a hitch.
Pro Offers a great palette tool
With GraphicsGale, the user can save and load palette, create gradation, and make color uniform.
Pro Free
Graphics Gale used to cost money but recently the program switched over to a free license.
Pro Pretty easy to learn the UI and the tools you have to work with are fantastic
Pro Works really well under Wine
Wine can help emulate Windows on non-Windows systems. You can get Graphics Gale running anywhere Wine can run. See WineHQ for more details.
Pro Free and open-source
It's actively developed on GitHub under MIT license, and it's totally free.
Pro Very easy to use
Pro Stylus support
It has decent stylus support, erasing and drawing
Pro Active development
Pro Multi-document editing
Interface is dockable and supports editing multiple documents at the same time, even side-to-side.
Pro Clean and readable interface
UX is very similar to popular editing tools like photoshop, so getting started is easy.
Pro Multi-document edititng
Interface is dockable and supports editing multiple documents at the same time, even side-to-side.
Cons

Con Only available on Windows
GraphicsGale is only available on Windows.
Con UI requires a lot of clicking
The UI windows not very nice and requires a lot of clicking. For example mouse wheel is not useable at all to zoom in and out in main window.
Con A little buggy
It's still in early development stage, so there are some bugs.
Con Windows only
