When comparing Coggle vs TagSpaces, the Slant community recommends TagSpaces for most people. In the question“What is the best cross-platform note-taking app?” TagSpaces is ranked 46th while Coggle is ranked 56th. The most important reason people chose TagSpaces is:
TagSpaces is free and open source making it easily extendable with the help of extensions.
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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 Open source
TagSpaces is free and open source making it easily extendable with the help of extensions.
Pro Your can choose your cloud file storage
Using only files and no databases let's you make the decision with which cloud file sync service to use, making sure your notes are made available on other devices and platforms. It works great with Owncloud, Nextcloud, Dropbox or Google Drive.
Pro No web service or database lock in
The backend is simply the directory and file structure on your harddrive.
Pro No cloud
TagSpaces is running completely offline, sending no data to any cloud based service, unlike many Evernote alternatives.
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.
Con It renames your files in order to tag them
The positive side of this drawback is that this way the tags are easily transferred to other platforms by simply syncing them.