Notes any agent can work in.
One place for your notes, tasks, calendar, people and code. Claude, Cursor or your own scripts work right alongside you, and you see every change they make, live.
Sign in with Google. Free while in preview.
Outside-in: no AI inside, bring your own
Common Ink has no model of its own. The agents you already use come to your notes, and every edit they make lights up with their name. History keeps it all, and Undo takes back just theirs.
MCP
Point Claude, Cursor or any MCP client at v1.commonink.app/mcp. It signs in like you do, so there's no key to copy.
CLI
commonink does everything the app does, for your scripts and shell agents.
Plain files
Every note is markdown. Read it, grep it, keep it in git, open it in any editor.
One place for the rest, too
Your notes already hold your plans. Common Ink makes them work.
Tasks
Type “Pay rent every month on the 1st” and it's a task with a due date that repeats.
Calendar
Google Calendar or any calendar feed, next to what's due today.
People
Contacts you can link from any note, each with every note that mentions them.
Code
Code blocks and diagrams that read well and copy cleanly.
Boards
Kanban boards that are just a list in a note.
Share with people
Make a workspace for your team, or share one note with a link. Viewers read, editors write, and an agent only ever gets the access its person has.
Yours to keep
Your notes are plain markdown, so they're never stuck here. Export one note or all of them any time, as a zip that opens in Obsidian. We don't sell your data, show ads, or train AI on your notes.
Pricing
Common Ink is free while it's in preview.
Questions
Is there AI built in?
No. You bring the agent you already use, and it works through MCP or the CLI. Common Ink just makes sure you can see what it did.
Which agents work with it?
Anything that speaks MCP: Claude, Claude Code, Cursor and more. Shell agents and scripts can use the commonink CLI.
Can I see and undo what an agent changed?
Yes. Its edits are highlighted as they happen, with its name. History shows every change, and Undo takes back one edit without losing what you've typed since.
Can I take my notes with me?
Any time. Export a note as Markdown, a web page, Word or PDF, or everything as a zip of markdown files.
What does it cost?
Nothing while it's in preview.
Start writing
Your first notebook comes with a short guide.