Could you detail these innovations?
It starts with rethinking the interface. All desktop pixel editors have a traditional menu system that takes up screen space, is completely text-based, and has options which lack spatial identity. Pixel Proof uses a popup menu with visual icons at spatially consistent locations which use text on hover to further describe themselves. Detailed settings are in submenus to stay out of the way until actually needed. This is all a big improvement in UX.
Pixel editors could do more to adapt to your needs. Pixel Proof approaches this issue in several ways.
Most pixel editors have a static interface. You pick from the predefined set of all tools and a full palette to do your work. Pixel Proof has customizable toolbars so that you pick the tools and colors that are appropriate for the work you are doing. Your editing flow can be preserved if you don't have to navigate a menu or locate the right tool in a big box of tools over and over again. Your toolset is saved in Pixel Proof's layered format so you can get right back to work next time.
You can set the background as either a flat color or as an image (with optional color modulation). You can draw over that image or, as I like to do, set the image in motion so that transparent pixels are always apparent.
Other images can be loaded into reference windows. These windows stay on top of Pixel Proof so that you can refer to the images as you work.
The pixel grid can be customized too. You can choose the spacing and offset (great for spritesheets) of two overlaid grids as well as the colors for them all.
The tools available in Pixel Proof include standard pixel tools (pencil, eraser, line, flood fill) and go much further. I considered the tasks that pixel artists handle and developed tools for making tedious work much easier.
Pixel Proof has tools for working directly with the alpha channel / transparency, e.g. a flood fill for transparency.
An outline tool helps to quickly render an outline around your figure. In the future, I plan to do the same with a filter layer so that the outline automatically adjusts as you work.
Some other tools are implemented which will be extended in the future. The Color Converge tool lets you adjust the painted pixels toward a chosen color, making shading, highlighting, and alternate colorings (e.g. ice, poison, stone, etc.) easy. The Soft Undo tool gives you fine-grained control over an undo step instead of all or nothing. The Selective Outline tool (a provocative name, perhaps) draws darkened pixels at the end of lines to form a suggestive outline.
And then, of course, there's the Twitter integration. Once you authorize the app, you can tweet your work along with a message with just two clicks. Pixel Proof can handle small pixel art by resizing it before upload so that Twitter renders it without blurring. Now you can share with friends or @Pixel_Dailies for fun or critique with no headache.
There's much more on the horizon, but I need to hear from more people about their needs and dreams of what an editor could do for them. I want more people to hear about Pixel Proof, share about it, use it, and see if it is right for them.