Obsidian has an amazing number of features that require a plugin in TiddlyWiki:
- Automatic saving
- Advanced MarkDown
- Checkboxes
- Tables
- References (separate citations)
- Folding bulleted text (Similar to Streams)
- Built-in alias mechanism
- Auto-complete of links
- Automatic re-linking
- Pasted images automatically externalised
- Pasted web text automatically converted to MarkDown
- Web extension (3rd party) that will copy Markdown AND download related image files.
- Smart Edit/preview (everything rendered except current line/block)
- Folding Sections
- "Transclude " sections of text like we used to have in TWC (i.e. block references)
- Info/Alert/Note call-outs
- Full Apps for Android and iPhone
- Side-by-side notes
The main strike against it is that it isn’t open source. But the data itself is stored as .md files (plus supporting image/pdf files), so is fairly portable.
Obsidian also has built-in access to a community plugin library, so you don’t have to go rummaging around the net to find things.
I feel that there are certain features that are so essential to the working of TW that they really ought to be in the official library – some sort of WYSIWYG, relink, HTML conversion.