Hi HN! ODocs.co is a free, no-login collaborative doc system that humans and their AI agents edit together (REST-native or MCP-native).

I was having trouble sharing Claude Code context and collaborating with our product managers, and I realized there might be an easier interface to collaborate on PRDs (product requirements docs) and engineering design docs.

The workflow I kept running into: 1. I would draft something with an agent or Claude Code session, 2. I'd share those thoughts for comments and feedback with a product manager or another engineer in a Google Doc or Notion page, 3. After we collaborated with comments, it was painful to have my Claude Code session (a) re-read comments, (b) edit/add updates into the existing Google Doc or Notion Page, and (c) preserve version history from edits from each user on the document without erasing and rewriting the whole document via MCP.

I realized that there might be an easier way to collaborate between engineers and product managers so that everyone could interact and collaborate with their own Claude Code/Codex/Gemini sessions as well.

I created ODocs.co as a free method (inspired by draw.io but with a freemium future) to make it easy for Human 1-Agent 1 and Human 2-Agent 2 pairs to collaborate. It also works great for agents sharing context to other agents.

To preserve version history from different users, I developed it to handle partial updates in collaborative documents without rewriting an entire document. LLMs aren't good at character counting, and I worked through some engineering / UX solutions to make the partial doc edits seamless on the AI side.

It supports multiplayer doc editing so humans and agents can all collaborate at the same time.

Check it out and let me know your thoughts! Feedback is very welcome in any direction.

Here's my blog post for further detail on why I created this: https://gregmicek.com/software-coding/2026/06/12/introducing...