Your context, anywhere you work.
Keystone is a note-taking app built around AI agents. It’s the brain your agents share — all your context, skills, and flows in one place, so you’re never locked into a single platform.
Your notes, your context.
Plain markdown on your disk that every agent you use can read — your knowledge moves with you, not the platform.
Free to use.
No account, no sign-up, no paywall. Download Keystone and start writing.
Private by default.
No tracking, no telemetry, no data sold. What you write stays between you and your machine.
Work with the formats you already have.
Keystone reads beyond plain markdown. Bring in the documents, spreadsheets, and PDFs your work already lives in — and let your agents reason across all of it.
Markdown blocks.
Every paragraph, heading, list, and image is its own block. Stack them, rearrange them, or pull one into another note — your page is a flexible stack of pieces, not a fixed document.
Every file format.
PDFs, Word docs, spreadsheets, CSVs, images, and screenshots — drop them in and Keystone parses them into the same workspace your agents already understand.
Integrated AI.
Chat, edit, and plan with AI right inside your notes. Every model you use reads from the same workspace, so context follows you wherever you work.
Skills.
Create, store, and manage the skills your agents run. Define a workflow once, then any agent in your workspace can pick it up — no repeating yourself across tools.
