When comparing MarkdownPad vs Notable, the Slant community recommends Notable for most people. In the question“What are the best open source Markdown editors for UNIX-like systems?” Notable is ranked 24th while MarkdownPad is ranked 36th. The most important reason people chose Notable is:
Simple tagging support is easy to use, and allows quick searching through multiple documents.
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Pros
Pro Allows customizing output
A custom CSS can be added to the rendered HTML to change the preview and output.
Pro Real-time HTML Preview
MarkdownPad is split in two panes. One pane is used for writing Markdown, the other shows the rendered HTML as it's written.
Pro Organize projects with tags
Simple tagging support is easy to use, and allows quick searching through multiple documents.
Pro Simple, clean interface
With a clean UI that lacks clutter, you can get right to work without a bunch of distractions.
Pro Supports markdown
Uses GIt-flavored Markdown, which is a popular and easy to use WYSIWYM format.
Cons
Con Many features are disabled in the free version
Free version lacks features like auto-save, PDF export, Markdown tables among many others and can't be used commercially.
Con Abandoned project
Nothing from author since 03/15. Pro version preview pane crashes, no fix has been offered. See user forums.