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.

Key Features:

• Agent-first canvas: Connect Claude, ChatGPT, Cursor or any MCP client. The agent reads the board's current state and writes work back as typed cards you can drag, group and comment on.
• The agent arrives briefed: A board is not an empty document. It carries your campaign process, the phases, and the field structure of each artifact, so the agent knows what a finished marketing email looks like before it starts one.
• Guidelines library: Your brand, voice and do-and-don't rules, which the agent must read before authoring anything. A built-in "Prevent AI language" preset turns off AI punctuation, hype, filler, formulaic structure and emoji.
• You hold the gate: Reversible work the agent does directly. Anything that spends money or cannot be undone is human-only, classified in server code rather than by prompt instructions, and failing closed.
• Memory that does not scroll away: Campaign state lives on the board rather than in a chat transcript, so an agent can open a clean context session and reconstruct an entire campaign in a single call.

Main Use Cases:

• Run a campaign end to end: research, audience segments, positioning, plans, emails and ad creative assembled as linked cards on one board.
• Review and approve AI drafts: watch the campaign assemble, edit cards, leave comments the agent picks up next session, and see each card's full lineage at the moment you approve it.
• Keep brand voice consistent: bind the agent to your guidelines before it writes, instead of correcting generic output afterwards.
• Resume work across sessions: rehydrate a campaign's full state into a fresh agent session without relying on a chat history.
• Hand off to your stack: the agent reaches Brevo, Mailchimp, Klaviyo, Canva, Meta Ads or Shopify through their own integrations. Plainpaper never holds those credentials.