When comparing P4 Editor vs Supernotes, the Slant community recommends Supernotes for most people. In the question“What are the best open source Markdown editors for UNIX-like systems?” Supernotes is ranked 28th while P4 Editor is ranked 35th. The most important reason people chose Supernotes is:
The note-card format is incredibly versatile, and great when you have lots of information.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Easiest way to write online
Pro Feature-rich
P4 is a free online Markdown editor with features such as live preview, auto save, and spell checker.
Pro Short-form note-cards
The note-card format is incredibly versatile, and great when you have lots of information.
Pro Responsive platform
Works on all devices, from mobiles to laptops.
Pro Full Markdown (with LaTeX equation) support
Great to be able to use all the features of Markdown, rather than a select few.
Cons
Con Only web apps for now
The developers haven't released native apps yet.