The primary features are meant to make API development much better:
- Sign in with X instead of setting up OAuth flows or auth.
- Webhooks are built in, so you don't need a server to catch.
- API docs autocomplete. No need to dig through them.
- It's Serverless. Deploy your add-on on save.
It's inspired by Google Apps Script, the platform that powers all Google Docs add-ons. Hence less like Greasemonkey in that it uses real APIs under the hood, and less like Zapier in that it's for building add-ons instead of event pipelines.