You've basically described Coda: https://coda.io https://coda.io It has far more data power than Coda, with tables that can be used as databases, a strong form

You've basically described Coda: https://coda.io https://coda.io It has far more data power than Coda, with tables that can be used as databases, a strong formula language, and loads of other nifty features. Like Notion, it's a closed-source SaaS.