Everything it does

The whole feature set,
at a glance.

A source-linked AI reading workspace — every highlight, note, screenshot, and answer stays pinned to the exact spot it came from. Private, portable, yours.

Annotate Source-linked Ask AI Agent Notes Share & export Your model Everything else

1 Library — your documents 2 Tools — highlight, comment, screenshot 3 The paper, with highlights & numbered pins 4 Source-linked notes & AI answers 5 Ask about the whole document

Read & annotate

Highlight text or box a figure.

HighlightCommentScreenshot a regionContinuous or single pageFind in document

The reader toolbar: select, highlight, comment, screenshot tools

Source-linked

Every note ties back to its exact spot.

A connector line joins each card in the panel to the highlighted passage or captured figure it came from — click a note and the reader jumps right to it.

Connector lineNumbered pinsJump to source

A connector line joining a note to its highlighted passage on the page

Ask AI

Answers pinned to the source.

Ask about any selection; the answer is saved as a note linked to that passage, with rendered math & code and a provenance panel showing exactly what it used.

Source-linked answersLaTeX & code@ai mentionsProvenance chips

An AI answer with rendered content and a provenance panel

Inspectable agent

Watch every step it took.

For deeper questions the AI reads other pages, searches the document, scans the outline, or searches the web — and you can open “the agent's work” to see each call.

Read pageSearch documentOutlineWeb searchCreate visual

The agent trace showing each tool call the AI made

Figures & visuals

Capture a figure — or generate one.

Screenshot any figure or equation and ask about it. The AI can also generate an image or a text/ASCII diagram to explain a concept, grounded in the paper.

Figure captureGenerated imagesASCII diagramsTakeaways

A note built from a captured figure, with an AI answer about it

Notes your way

Show what matters on the card.

Check any message — say the AI's summary instead of your question — to show it in full on the collapsed card. Plus tags, resolve, filters, search, and sort.

Show on cardTagsResolveFilter & searchSort by time / page

A collapsed card showing the full AI answer, tagged AI

Bring your own model

Your model, your key.

OpenRouter (default) or any OpenAI-compatible endpoint. Your key stays in your browser and is sent per-request — never saved on a server. Toggle visuals and web search.

OpenRouterOpenAI-compatibleBYO keyTool toggles

Settings — AI & Tools: providers, models, and keys

Editable prompts

Tune every prompt.

Edit the system prompts — even the agent's tool descriptions — under Settings → Templates, then export or import your whole set as JSON.

System promptsTool descriptionsExport / importReset to default

Settings — Templates: editable system prompts and tool descriptions

Portable & private

Notes you own, on your machine.

Everything stays in your browser. Optionally sync a portable .notes.json to a folder (Chrome/Edge) so notes travel with your PDFs — great for Drive and other devices.

Browser-only by defaultFolder syncNo cloud uploadNo login

Settings — Storage: browser-only notes with optional folder sync

Scanned PDFs

Scanned? It reads the page for you — on your device.

Open an image-only PDF and PairedX notices there's no selectable text, then offers one-tap OCR that runs entirely in your browser — your file is never uploaded. It rebuilds a real text layer, so search, highlights, and the AI all work like a normal PDF.

Auto-detectedOn-device — nothing uploadedReal selectable textHighlightable & searchableCached — runs once

PairedX detecting a scanned PDF and offering one-tap on-device OCR

And everything else

The full list, grouped — every one of these ships today.

Reading

Single-page & continuous scroll
Zoom, page jump, page thumbnails
Find in document (⌘/Ctrl-F)
On-device OCR for scanned PDFs
Collapse / resize panels

Annotating

Highlight text
Point comments
Screenshot a region
Selection popover: Highlight · Note · Ask AI
Numbered pins in reading order

AI & agent

Ask about a selection or the whole doc
Tool-using agent (ReAct)
Read page · search · outline · full read
Web search · create visual
Streaming answers & agent trace
Generated images & ASCII diagrams
LaTeX, Markdown & code rendering

Notes

Compact ↔ expanded cards
“Show on card” full-length preview
Reply / follow-up in-thread
Auto & manual tags
Resolve, copy, edit, delete
Edit question & re-ask AI

Notes panel

Filters: all · unresolved · screenshots · AI · questions
Search notes
Sort by time or page
Auto-scroll to active note

Library

Home · Recents · Starred · Trash
Star · trash · restore · delete
Remove the bundled sample
SHA-256 content addressing
Storage meter

Open & attach

Open a PDF, notes, or shared .html
Multi-file & drag-and-drop
Notes auto-attach by content
“Found notes for this PDF” prompt

Share & export

Share as self-contained .html
Read-only viewer + made-with banner
Re-open shared file to keep editing
Export annotations to PDF
Save / import notes JSON

Model & prompts

OpenRouter or OpenAI-compatible
Bring your own key (browser-only)
Pick text & image models
Editable prompt templates
Editable agent tool descriptions
Export / import / reset prompts

Storage & privacy

Browser-only (IndexedDB + localStorage)
Optional folder sync (File System Access)
No cloud upload of your PDF
No login, no tracking cookies

Your identity

Set your name & initials
Toggle visuals / web search

Open & free

AGPL-3.0, self-hostable
Static frontend + serverless AI proxy
One-click Vercel deploy

Try it — no signup, no install.

Open a PDF and start annotating — it runs entirely in your browser.

Open the app View on GitHub

The whole feature set,at a glance.