When comparing Coggle vs Tomboy, the Slant community recommends Tomboy for most people. In the question“What is the best cross-platform note-taking app?” Tomboy is ranked 14th while Coggle is ranked 56th. The most important reason people chose Tomboy is:
All the components are free, opensource, and allows self-hosting the sync server.
Specs
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Pros
Pro Supports Markdown (their own variant)
Markdown is a plain text formatting syntax designed so that it can optionally be converted to HTML using a tool by the same name.
Pro Collaborative
Coggle allows inviting friends and colleagues to work collaboratively on notes and diagrams in real-time.
Pro Pretty diagrams
No effort to create beautiful diagrams.
Pro Supports LaTeX
LaTeX is a document preparation system and document markup language. It is the de facto standard for the communication and publication of scientific documents.
Pro Allows easy color-coding of paths
Pro Versioning support
Enter history mode to view all changes to a diagram over time, and make a copy from that point.
Pro Optional Chrome store App
Pro Free
Pro Lots of export options
Exports to PDF, image, plaintext and .mm files.
Pro Free and open source
All the components are free, opensource, and allows self-hosting the sync server.
Pro Can be extended with add-ins
If Tomboy doesn't have the features you want out of the box, you may be able to find them here as a plug in.
Pro Lightweight
Cons
Con Tree relations only; no non-parent links
Coggle's model allows a node to have multiple children, but only one parent, and no other connections of any sort.
Con Unconventional note taking style
Coggle is a mind mapping application, not a traditional text based note storage platform.