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Comparison

Sidenote vs ChatGPT

ChatGPT does almost everything; Sidenote does the one thing it can't, reading the page you already have open with no upload and a citation to the exact passage behind every answer.

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Sidenote

Comes to the text: reads the page you have open, no copy-paste, no upload.

ChatGPT

You bring the text to it: a blank chat that takes pasted passages and uploads.

The short answer

Should you use Sidenote or ChatGPT?

Choose Sidenote if…

You read across PDFs, Confluence, Notion, SharePoint and articles and want answers in place, without uploading anything. Citations scroll to the exact passage, and unsupported claims lose their citation before you see them.

Choose ChatGPT if…

You want one assistant for everything (writing, brainstorming, coding, long-running agent tasks, generating images) and you don't mind copying text in or uploading a file when you need to ask about a document.

Most people use both. ChatGPT is the general workhorse; Sidenote is the specialist for reading and citing what's in front of you.

Compared honestly

Sidenote vs ChatGPT: feature by feature.

CapabilitySidenoteChatGPT
Reads the page or PDF you already have openYesNo
Works on private Confluence, Notion & SharePoint pagesYesNo
No copy-paste or upload to ask a questionYesNo
Citations scroll & highlight the exact passageYesNo
Server-side citation check drops unsupported claimsYesNo
Upload or attach your own filesYesYes
Ask across many documents at onceYes Partial
One-click glossary of jargon & acronymsYes Partial
General writing, brainstorming & coding helpNoYes
Image generation, voice & live web browsingNoYes
Native mobile & desktop appsNoYes

Last reviewed: 16 July 2026.

Three whole rows go to ChatGPT, and we're not pretending otherwise; see Where ChatGPT is the better tool below. The cross-document and glossary rows above are powered by Sidenote Collections; the citation rows are unpacked in what verified citations mean.

The core difference

A chat window you bring text to, or a reader that comes to the text.

ChatGPT is a destination, and the browser-agent era made it more of one, not less. OpenAI shipped its own browser, Atlas, then folded it into ChatGPT Work in July 2026: the agent now browses in a cloud browser on your behalf. It's astonishingly capable across writing, code and long-running agentic work. But the motion is inward, bringing the web to ChatGPT; to ask about the document in front of you, you still bring the document to the box.

Sidenote moves the other way: into your browser. It sits in the side panel of every tab, reads what you already have open, and answers in place. Every answer is grounded in that document and verified server-side, so a cited quote is verbatim from the source or the citation is dropped, and clicking one scrolls the real page and highlights the exact passage.

The difference in one example

Take a private Confluence runbook. To ask ChatGPT about it you'd copy the text into the chat, and you still wouldn't get a click back to the exact line. Sidenote reads it where it lives, on your session, and its citations scroll you to the proof.

Giving credit

Where ChatGPT is the better tool.

This isn't close, and we won't pretend it is. ChatGPT is a far more general tool, and for most of what it does, Sidenote isn't even trying to compete:

Writing & brainstorming

Drafting, rewriting, summarizing from scratch, ideating: open-ended work with no source document. Sidenote stays anchored to what you're reading.

Coding & general problem-solving

Debugging, generating code, explaining algorithms, planning a project. A general assistant's home turf, not a document reader's.

Agents, images, voice & a huge feature surface

Long-running agentic work in ChatGPT Work, image generation, voice mode, custom GPTs, native mobile and desktop apps. Sidenote is a focused desktop browser extension by design.

FAQ

Sidenote vs ChatGPT: common questions

For reading and questioning the documents in front of you, yes. ChatGPT is a brilliant general assistant, but to ask it about a page you have to copy text in or upload a file, and it answers from a separate chat window. Sidenote reads the page you're already on with no upload, and every answer cites the exact passage: click it and the document scrolls and highlights. For day-to-day reading that's a tighter fit; for everything else, ChatGPT is the broader tool.
Not the ones open in front of you. Since OpenAI folded its Atlas browser into ChatGPT Work in July 2026, ChatGPT's agent browses in a cloud browser of its own, and you can even hand it logins, but it works in that remote session, not on the tab you're reading, and its answers don't come back pinned to an exact passage. Sidenote runs inside your browser on your own session, so it reads what's on your screen (including private wikis, SharePoint and intranet pages) without anything leaving that page.
When it browses the web it can link to pages, but it won't reliably show you the exact sentence an answer came from, and it can still state things the source doesn't support. Sidenote checks every answer server-side against the passages actually retrieved and drops the citation on any claim they don't support. Clicking a citation scrolls the real document to the exact line and highlights it, so verifying takes a second.
Any model can guess. The difference is what surrounds it. Sidenote is constrained to the document you're reading and runs a server-side citation check that removes unsupported claims before you see them, rather than answering confidently from general knowledge. ChatGPT is designed to be helpful across everything, which is its strength, but it makes it easier to get a fluent answer that isn't grounded in your source.
Most people do. Keep ChatGPT for writing, brainstorming, coding and open-ended questions; use Sidenote for reading and citing the documents you have open in the browser. They overlap a little but they're built for different jobs.
Both have a free tier. Sidenote's free plan covers everyday summaries, explanations and glossaries, with an opt-in 7-day Pro trial that needs no card; paid plans start at £10/month. ChatGPT has a free tier and paid plans above it, priced separately.
Try it on the page you are on

Read anything. With citations.

Add Sidenote to your browser and ask the document in front of you a question. No upload, no copy-paste, no new tab. Just the answer, and the passage that proves it.

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7-day Pro trial · No card required · Free plan forever