Stop scrolling away from the good part.

Comment threads for ChatGPT, Claude & Gemini — like Google Docs, but for AI answers. Highlight it, ask about it, right there in the margin.

Add to Chrome — free

Free forever
Open source 🔓

ChatGPT Claude Gemini

CHATGPT · LONG ANSWER

…the deposit is refundable only if you cancel within the statutory cooling-off period, which varies by state. After that window closes, the landlord may retain…

💬 YOUR MARGIN THREAD

wait — how long is that in California?

In California it's 3 business days for most contracts (Civil Code §1689.5) — some door-to-door sales get 5.

Install in ten seconds ⚡

Open the Web Store

Go to Marginalia's listing — free, no account needed.

Click "Add to Chrome"

Confirm with "Add extension". That's the whole setup.

Open a chat

Visit chatgpt.com, claude.ai or gemini.google.com and highlight any text in an answer.

How to use it

Highlight any phrase in an AI answer and a comment box opens beside it. That's it.

Highlighting text opens a comment box — **Ask about a selection.** Highlight the phrase you're unsure about and type your question in the margin.

The reply streams into the margin thread — **Read the reply in place.** The answer streams into the thread — the text you were reading never scrolls away.

A second question minimizes other threads — **Ask as many as you like.** Starting another question on the same chat minimizes the other threads and focuses the new selection.

Configure 🔧

Logged into Claude or Gemini? It just works — zero setup. Prefer API keys? Add them on the settings page.

Marginalia settings page — **The settings page** is where you set up API keys. Without keys, it uses the chat app you're already signed into (Claude and Gemini).