See its readme about details of TidGi's design decisions, here is a brief summary:

1. TidGi runs TiddlyWiki on Node.js while TiddlyDesktop focus on single HTML wiki
2. TidGi has built-in git-sync backup script
3. TidGi provides some electron based feature, such as a menubar mini window and a shell executor.

How to install

1. Install the latest release of TidGi Desktop from https://github.com/tiddly-gittly/TidGi-Desktop/releases/latest
2. Run TidGi
3. Create a new wiki, or open an existing nodejs tiddlywiki folder
4. Changes are automatically saved, you can optionally configue it to sync to the github every 30min