When comparing Outsprite vs Pixla, the Slant community recommends Outsprite for most people. In the question“What are the best pixel art / sprite editors?” Outsprite is ranked 24th while Pixla is ranked 36th. The most important reason people chose Outsprite is:
The product is web-based and therefore available on all platforms
Ranked in these QuestionsQuestion Ranking
Pros
Pro Web-based
The product is web-based and therefore available on all platforms
Pro "Free"
Considering what you get and in comparison with some competitors, you have to say that this is a pretty inexpensive piece of software. If you use it, you are free to make a donation. Otherwise Pixla is "free".
Pro Easy to use
Clean, uncluttered interface which is a must for a tool like this.
Cons
Con Still under development
This is not a finished product and is missing key functionalities since its still under development
Con GUI
The style of the GUI might seem a little outdated, but that is a matter of personal taste more than anything.