Thoughts need a warren.

The free and flexible app for your private notes. No cloud by default — your thinking stays wherever you keep it.

macOS · Linux · iOS · Android — free for personal use everywhere

Privacy

Warren keeps notes on your own device. It works offline, opens instantly, and no one — not even us — can read them.

Flexibility

Hundreds of plugins and themes let you reshape Warren to fit the way you think — instead of the other way around.

Longevity

Notes are stored as plain Markdown files. There's no lock-in to a service — your data stays yours for the long term.

What's inside the warren.

Five ideas do most of the work. Dig into each one on its own page.

Link notes to notes and watch the passages between your ideas take shape.

An open surface for laying out notes, images, and whole ideas side by side.

Thousands of community plugins let you furnish Warren exactly how you like.

Carry your notes to every device with end-to-end encrypted synchronization.

Turn a Warren into a website — a wiki, a knowledge base, a digital garden.

Free for personal use. Simple add-ons if you need sync, publish, or a team.