Comparison
Sidenote vs ChatGPT
ChatGPT is a general-purpose assistant that does almost everything. Sidenote does one thing it can't: it reads the page you already have open — PDF, Confluence, Notion or article — with no upload, and cites the exact passage behind every answer. Here's an honest, feature-by-feature comparison.
The short answer
Should you use Sidenote or ChatGPT?
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 openSidenoteYesChatGPTNo
Works on private Confluence, Notion & SharePoint pagesSidenoteYesChatGPTNo
No copy-paste or upload to ask a questionSidenoteYesChatGPTNo
Citations scroll & highlight the exact passageSidenoteYesChatGPTNo
Server-side citation check drops unsupported claimsSidenoteYesChatGPTNo
Upload or attach your own filesSidenoteYesChatGPTYes
Ask across many documents at onceSidenoteYesChatGPTPartial
One-click glossary of jargon & acronymsSidenoteYesChatGPTPartial
General writing, brainstorming & coding helpSidenoteNoChatGPTYes
Image generation, voice & live web browsingSidenoteNoChatGPTYes
Native mobile & desktop appsSidenoteNoChatGPTYes
Three whole rows go to ChatGPT, and we're not pretending otherwise — see Where ChatGPT wins below. The cross-document and glossary rows are powered by Sidenote Collections.
The core difference
A chat window you bring text to, or a reader that comes to the text.
ChatGPT is a destination. You open a blank chat and bring the work to it — a question, a pasted paragraph, an uploaded file. It's astonishingly capable across writing, code and open-ended thinking. But to ask about a document, you first have to get that document into the box.
Sidenote never asks you to leave. 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, checked server-side, and clicking a citation scrolls the real page and highlights the exact passage.
The difference in one exampleTake 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 & brainstormingDrafting, rewriting, summarising from scratch, ideating — open-ended work with no source document. Sidenote stays anchored to what you're reading.
- Coding & general problem-solvingDebugging, generating code, explaining algorithms, planning a project. A general assistant's home turf, not a document reader's.
- Images, voice & a huge feature surfaceImage 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
Is Sidenote a good ChatGPT alternative for reading documents?
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 rides along in your browser, 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.
Can ChatGPT read my private Confluence or Notion pages?
Not on its own. ChatGPT can browse public web pages and read files you upload, but it can't sign in as you, so a page behind your company login is invisible to it unless you paste the text in by hand. 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.
Doesn't ChatGPT cite its sources too?
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 — and clicking a citation scrolls the real document to the exact line and highlights it, so verifying takes a second.
Which one hallucinates less?
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.
Can I use both?
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.
How much does Sidenote cost compared to ChatGPT?
Both have a free tier. Sidenote is free to install with a 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're on
Read anything. With citations.
Add Sidenote to Chrome 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.
7-day Pro trial · No card required · Free tier forever