One shared document. A private AI for each person.
Draft a contract, proposal, or agreement together in one live document — while everyone has their own private assistant, notes, and files. The document is shared; your strategy stays yours. Mark paragraphs as you agree to see what’s settled.
Start a documentSee how it works
Pay for the AI you use
Good for: co-founder agreements · client proposals · contract revisions · parenting plans · sensitive internal drafts
Built on GPT-5.4
Live editing isn’t the hard part
A shared document everyone can edit at once — Google Docs solved that years ago. The hard part is the writing. Built-in assistants like Gemini in Google Docs are good at chatting about a document but clumsy at actually changing it — they hedge, summarize, or hand back something you have to paste in yourself. Mediator runs a frontier model (GPT-5.4) that works on the document directly: ask for a tighter indemnity clause or a softer rejection and it rewrites the paragraph in place, in your voice.
The other challenge is that everyone needs help with their own part — their priorities, their constraints, the wording they’re not ready to propose yet. Paste the document into a shared chatbot and you’re both talking to the same assistant, in the open. Google Docs and Notion are no different — one shared AI, everything you ask it visible in the room. That’s not how anyone works through wording that matters.
A private assistant for each person
Mediator gives every participant a private assistant over one shared document. Ask it to redraft a paragraph, weigh an option, or explain what someone else just changed — and no other participant sees it. The shared object is the document; the thinking stays yours.
Every change is attributed, with a running history of what moved and who moved it. (And if you’ve been trading drafts by email, five versions deep — that goes away too.)
How privacy works
Your work here is sensitive, so the answers are blunt:
- Can anyone else — or their assistant — read my private notes?
- No. The shared document is visible to everyone you invite. Your private workspace — your assistant chat, your notes, the files you upload — is yours alone. Other participants never see it.
- Can the person who started the document see my assistant chat?
- No. “Yours alone” includes whoever created the document, even though their account covers the AI used on it. They see the shared document and its history — not your private workspace.
- Is any of it used to train AI models?
- No. We don’t use your documents, notes, or assistant chats to train models.
What it costs
Pay-as-you-go — no subscription, no seats. Editing the document is free; you spend credit only when you ask your assistant to do something, like redrafting a paragraph or weighing an option. Whoever starts a document covers the AI for everyone they invite, so guests don’t need credit of their own. Most documents cost a few dollars.