The first time I used Tiddly years ago, the UX never resonated with me so I wasn't able to get over the learning curve.

More recently, one of our users gave me a pretty detailed tour of their Tiddly, which shares sentiments of the other commenters. Single file is great until it's not. Lots of plugins but requires manual config. Needing to startup a server to collaborate wasn't great.

What "killer features" do you think Tiddly has?