Sidenote

In plain words

Sidenote is a browser extension that enables users to comment and live chat on any webpage without creating separate accounts. It unifies community conversations across the internet by allowing visitors to discuss content directly on pages they're browsing. The tool is designed for people who want to engage in online discussions while avoiding the need to sign up for multiple platforms.

written from the facts on this page · September 2026

From the sources

Sidenote is a browser extension that allows you to live chat or comment on any page of the internet. Unify your community conversations and stop creating accounts to discover what people are saying online.

Your team's knowledge, right where you need it

Centralize and organize your company's knowledge directly in your browser. Make it easy for your team to find the information they need. Add notes and documentation directly to the pages where they're needed. Your team will find the right information at the right time. Create step-by-step guides for your tools and processes. New team members can follow along directly in their browser as they learn. Capture and share insights as you browse. Turn your team's research into a knowledge base that grows with yourfrom sidenoteapp.com

• 
  DoneNote2023 · donenote.com · ▲253

  Leave notes straight on the web page with your entire team

• 
  Sidenotes2014 · sidenotes.co · ▲125

  Annotate the web.

• 
  Page Notes Sidebar2025 · chromewebstore.google.com · ▲107

  Capture thoughts where they happen

• 
  A Firefox extension to leave comments on any URL2019 · github.com · ▲227

  An extension for Firefox and Chrome to add comments to any URL - comntr/webext

• 
  Sidenote AI2023 · sidenote.ai · ▲228

  AI copilot for meeting follow-up

• 
  Socially Browse Chrome Extension2020 · ▲88

  Comment and rate any website without leaving the page

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