Show HN: A rich, HTML-native document canvas for human <> AI collaboration

We've spent the last several months iterating on a rich, HTML-native document canvas. We kept finding we wanted a shared space where we could work on a written artifact with our team while getting some AI assistance along the way.

Lots of interesting and challenging problems when designing a document editor that allows many humans and agents to understand and edit simultaneously. Especially one that supports things like Mermaid diagrams and XYZ flow charts out of the box!

We're officially GA, would love for people to give it a shot and tell us what they think. Feedback is greatly appreciated! If people want more credit, shoot us a note (hello@productnow.ai), we're happy to support :)