When comparing Elephant vs SynapBook, the Slant community recommends Elephant for most people. In the question“What is the best cross-platform note taking app?” Elephant is ranked 5th while SynapBook is ranked 19th. The most important reason people chose Elephant is:
Only basic features are added to Elephant so users aren't overloaded with the interface.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Only the essentials
Only basic features are added to Elephant so users aren't overloaded with the interface.
Pro Files are stored locally
Instead of moving files over the cloud, files are stored locally for extra privacy. For syncing, any cloud service can be used.

Pro Markdown supported
This can be useful when formatting files in HTML.
Pro Active development
The developer has replied, and added many features which users have suggested in the comments on the website.
Pro Highly compatible
Elephant is compatible with Mac OS, Windows, and Linux.
Pro Files can be uploaded by drag'n'drop
Pro Open source
All features can be used or edited at will for free.
Pro Memo can be structured in tree form
Using the tree structure, you can structure the content.
Pro Nice sticky memo UI
It can support pop-up notes which can be used like simple Windows Sticky memo app.
Pro Both search-based Memo and organizing tree Note
Search-based notes and tree-oriented tree notes are supported separately, so can be used conveniently depending on the purpose.
Pro Offline mode support
Basically, it is based on server synchronization, but it can be used offline.
Pro Folding
Groups can be folded.
Pro Various text styles and decorations
General styles (bold, font size), highlighter and separator line, and more.
Pro Frequent updates
Bug fixes and additional new features rolled out frequently.
Pro Free
Cons
Con No mobile app
No mobile apps (can use common sync tools to edit plain files, though).
Con No WYSIWYG editor
Con Light on features
While not labeled a beta, Elephant is a new note program and doesn't offer all the bells and whistles.
Con Does not support iOS
This app only supports Android and desktop OS, but not iOS.
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