An AI writing tool where you hold the pen
A shared doc where your AI reads along and suggests. You write the first draft; it reviews you right where you write.
Try the live app:
Visit Co—span →Why Co—span?
You're tempted to use AI, but AI sucks at writing. It's sometimes more work to write with AI and then clean it up so it's not full of fake-sounding phrases. But AI is not all bad - it can be pretty good at spotting mistakes and fixing errors. AI can even read, analyze, suggest and question. Especially if you tell it what you're trying to say, and who you're saying it to.
Write your draft in Co—span, a shared doc where your AI reads along and suggests.
The assistant you hook up to Co—span watches your draft (and your edits - as you write) and gets to work: pointing out where a thought is unclear, where you're not focused on your intent, and where you might be confusing the reader. It suggests. You decide. It's like a coworker that's live in the same doc as you. Co—span isn't a chat box that writes for you. It's your file, and you hold the pen.
Your thoughts, your words. But reviewed, enhanced, aligned - all with your direction and approval.
Co—span lets you focus on writing in one place. No switching windows or context. No chatting with the AI on the side while you try to write: just your own agent (Claude Code, Codex or another) connected and working inside the document, alongside you.
You don't need AI to write it for you. I promise. Try Co—span and write your best work.