When comparing PaintCAD 4Windows vs Paint.NET, the Slant community recommends Paint.NET for most people. In the question“What are the best pixel art / sprite editors?” Paint.NET is ranked 9th while PaintCAD 4Windows is ranked 28th. The most important reason people chose Paint.NET is:
Unlike most photo editing software, Paint.NET is simple to learn and easy to use. This means less time is spent learning the in's and out's of Paint.NET and more time on photo editing. For those who only edit photos sporadically and don't have time to invest in learning complicated tools for editing, Paint.Net will suit your needs.
Specs
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Pros
Pro Doesn't need to be installed
Simply download package, unpack, and use: no installation/setup/registry are required. Furthermore, all settings are saved in its own folder.
Pro You can draw images using the keyboard alone
The cursor on the image allows you to move it to any pixel of your image and place colored pixels precisely. You can draw on a small notebook (when travelling on a train or bus, for example), or in any other situation where you don't have access to a mouse.
Pro Completely free to use
All the user has to do is download the software and put it to use: draw images, create animations (gif), videos (avi), tilemaps, draw raster PCF fonts, and use it on your images for free!
Pro Support for Russian and English
The interface and help system have two localizations (English and Russian) included in the distributive package.
Pro Works with every Windows version
PaintCAD 4Windows doesn't need any .net, java, or other VM installed: it is a pure Windows 32-bit application and will work on every Windows-based operating system starting from Windows 95 until Windows 10.
Pro Easy to learn and use
Unlike most photo editing software, Paint.NET is simple to learn and easy to use. This means less time is spent learning the in's and out's of Paint.NET and more time on photo editing. For those who only edit photos sporadically and don't have time to invest in learning complicated tools for editing, Paint.Net will suit your needs.
Pro Free software
There is no charge for this software; but donations are welcomed.
Pro Lightweight
Paint.net provides a streamlined but effective core tool set. Support for advanced and niche features is provided through modular plugins, allowing the user to install only what's needed.
Pro Actively developed
The project is active and being continually expanded and refined.
Pro Active and friendly community
The forums are filled with tutorials, as well as people who are friendly and eager to help.
Pro Plugins allow extra functionality
Plugins can be made by anyone in the community, and are offered for download on the forum. They extend the capabilities of Paint.NET to cover most tasks.
Pro HiDPI support
Paint.NET supports fully HiDPI displays, with no scaling problems.
Cons
Con Only available on Windows
Paint.NET is only available on Windows.
Con No project-based interface
You can only edit a single image at a time in Paint.NET. For example, in other tools you can open 5 or a 100 images at the same time, and stack those windows in all directions.
Furthermore, when you are editing in Paint.NET you can only "view" a single image at a time, even though you can have multiple images open. This limits your zooming ability, as the image will go fullscreen quite quickly, and hide parts of it behind the floating toolbars which can not be embedded anywhere on the screen.