At first I thought it is tiddlywiki but it is not.

The author (me) was strongly inspired by TiddlyWiki -- I love that software and wish it was allowed to proliferate more. If only browser vendors allowed their users to persist HTML files back to their own machines, we'd have a whole new ecosystem of personal applications!

I wish I could change the name from Hyperclay to TiddlyApp :)

Thank you for your kind words, much appreciated, speaking as the creator/maintainer of TiddlyWiki. I really like what you've done, and the way you've described it on the site. I hope you will enjoy success with it, and have as much fun with it as I have with TiddlyWiki.

> If only browser vendors allowed their users to persist HTML files back to their own machines, we'd have a whole new ecosystem of personal applications!

The trick TiddlyWiki does with data URLs (IIRC?) (https://tiddlywiki.com/#Saving%20with%20the%20HTML5%20saver) seems pretty close to me.