~ a second brain, hand-bound ~

Write it down before it wanders off. Find it again in the margins.

Marginalia is the notebook that remembers like you do — sideways. Jot, sketch, clip, and scribble; it quietly ties every thought to the thoughts beside it.

Get Marginalia — free Peek inside

works on paper-adjacent devices: Mac, iPad, phone, web

capture ✎ connect ✎ recall ✎ daydream ✎ est. 2026 ✎ capture ✎ connect ✎ recall

Your memory isn't a filing cabinet.

— it's a wanderer. So we built a notebook that wanders with you.

✎

Everything's a margin

One keystroke opens a scratch page anywhere. Voice scribbles, screenshots, half-dreams — all welcome, all searchable later.

🧵

Ideas find their thread

As you write, yesterday's notes appear in the margins — the related ones you'd forgotten, stitched in automatically.

🔦

Ask the archive

"What did the book club say about tolerance?" Marginalia flips to the exact page and reads it aloud in your voice notes.

🌱

Notes that resurface

A gentle daily page of forgotten thoughts, like finding a shopping list from 2019 in a coat pocket — except useful.

What's inside the book

honest contents, no surprises

  • A single capture bar for text, voice, and clippingsone inbox, zero "where did I save that"
  • Automatic margin notes linking new ideas to old onesbacklinks without the nerdy setup
  • Plain-text export whenever you want to leaveit's your writing, obviously
  • Offline by default, syncs when it canworks beautifully on trains
  • Encrypted, ad-free, and priced like a nice penfree forever for one notebook
psst — founders say the resurfacing alone "paid for itself in one week". we measured. they're right.

A kind letter

from a reader in Reykjavík

"I've kept notebooks my whole life and lost the thread of every one of them. Marginalia is the first that acted like a collaborator instead of a warehouse. Last month it handed me a footnote I'd written four years earlier — it won me an argument I'd already lost twice." — Sigrún, translator

Start your first page.

free for one notebook · $4/mo for the whole bookshelf

Download & start scribbling