Read closely.
Keep what matters.
Folio is a research workspace for papers, lectures and the web. Highlight a passage, drop it into your notes, and ask an assistant that answers from what you’re reading — and tells you when it isn’t.
Forgetting is fast, then slow
Ebbinghaus relearned lists of nonsense syllables and counted the work each relearning saved.
The decline, rapid in the beginning, becomes afterwards exceedingly slow.
Early reviews do most of the work. Worth testing against Spacing schedules.
The experiments here described were meant to show how the retention of a series, once learned, depends upon the time which has passed since the learning. The series were relearned after intervals of from a third of an hour to a month, and the work saved in relearning was taken as the measure of what remained.
It will be seen from the table that the loss is at first very rapid. Within the first hour more than half of the original work must be done again; after a day, about two-thirds; after a month, somewhat less than four-fifths. The decline, rapid in the beginning, becomes afterwards exceedingly slow.
Whether the curve holds for material of other kinds — prose, verse, or series of numbers — is a question to which the later chapters return.
It’s his measure of memory: how much less work it takes to relearn a series than it took to learn it at first.
On this page, about a third of that work is still saved after a day, and the decline slows sharply after the first hour (Memory, p. 76).
The experiments here described were meant to show how the retention of a series, once learned, depends upon the time which has passed since the learning. The series were relearned after intervals of from a third of an hour to a month, and the work saved in relearning was taken as the measure of what remained.
It will be seen from the table that the loss is at first very rapid. Within the first hour more than half of the original work must be done again; after a day, about two-thirds; after a month, somewhat less than four-fifths. The decline, rapid in the beginning, becomes afterwards exceedingly slow.
Whether the curve holds for material of other kinds — prose, verse, or series of numbers — is a question to which the later chapters return.
From a highlighted line to a finished paragraph.
Four moves you already make when you read seriously — kept in one window, and connected.
Read
Open a PDF, a web page or a YouTube lecture beside your note.
Highlight
Select a passage to highlight, comment, or link it into your note.
Ask
The assistant answers from your selection, the page’s highlights and your note.
Write
Insert the answer into your note. Quotes stay linked to their highlights.
Bring everything you read.
Papers & books
PDFs up to 100 MB, with selectable text and page-accurate highlights.
Web pages
A clean, script-free copy of any article that you can highlight like a page.
Lectures
Video beside its transcript. Cited timestamps like 12:40 jump the video there.
Posts & threads
Save a post, or import your whole bookmarks archive.
An assistant that shows its work.
Ask about a passage and Folio answers from what you’re actually reading. When it has to go further, it says so first.
Notes that read like writing.
Your reading, organized for you.
Folio suggests three to six subject tags for every paper, link and video, reusing the ones you already have. Everything is a keystroke away.
Search everything with ⌘K
Notes and the full text of your PDFs, ranked by title first. Partial words and typos still match.
Subject tags, suggested for you
Filter by links, papers, videos, tweets or notes, and browse by subject.
See how it connects
A graph of your notes, sources and subjects. Click any node to open it.
Focus reading mode
The paragraph under your cursor comes forward; the rest of the page steps back. Esc to leave.
Folio for the web
Private betaSign in from any browser. Your notes, sources and chats live in your private workspace; API keys you add are encrypted before they’re saved.
Folio for Mac
Coming soonThe same workspace as a desktop app, with your notes kept as plain Markdown files in a folder on your Mac.
Start free. Keep it if it earns its place.
Everything in Pro while you decide. No card needed.
- The full assistant on Folio’s keys
- PDFs, web pages, lectures and X
- Library, graph and search
Folio’s assistant on our API keys, with a generous monthly token allowance.
- GPT and Claude models
- AI subject tags for your library
- Everything in the trial
A lower price. Chat runs on the OpenAI or Anthropic key you save in Settings.
- Usage on your key isn’t metered by Folio
- Keys encrypted before storage
- Everything else in Pro
Prices in USD. Pricing may change before public launch.
Answered from the source.
Does the assistant read my whole PDF?
No, and that’s deliberate. It answers from the passage you’ve selected, the highlights on that page and your current note — so answers stay tied to what you’re reading.
Which models can I use?
OpenAI’s GPT models and Anthropic’s Claude models. On the bring-your-own-key plan, chat runs on your own key.
What happens when the trial ends?
The assistant pauses until you choose a plan. Your notes, sources and highlights stay where they are.
When is the Mac app coming?
It’s in testing now. Join the waitlist and we’ll tell you when it’s ready.
Your next paper deserves better than twelve open tabs.
Folio is opening to researchers and students a few at a time.