Plainpaper

Plainpaper is an infinite canvas for marketing campaigns, shared between you and your AI agent. Connect Claude, ChatGPT, Cursor or any MCP client and it writes research, segments, plans, emails and ad creative back as typed cards you can see, edit, rearrange and comment on. Two things make that output usable rather than slop. The board briefs the agent before it starts: your campaign process, the structure of each artifact, and a guidelines library holding your brand and voice the agent has to follow. And you hold the gate: nothing ships until you approve it, and anything that spends money or cannot be undone is never the agent's call. Plainpaper brings no model of its own and never sends an email or publishes a post itself.