Comments on every website
share advice, better deals, browsing tips and opinions…

common's main view screenshot

Read helpful comments from other people
Get discounts, scam warnings, hints to navigate a site…

Add to Google Chrome
Using Safari, Firefox or Edge? Drag and drop [common] to your bookmarks bar

common is free, no account needed
Add the extension and you are ready to go

common is a browser tool that lets you post notes in any web page and read notes from other people.

You can also store private notes by unchecking Share with everyone so you can store passwords, shopping lists and more.

All users can vote notes Up and Down to sort them out.

What can I comment on?

Anything you want. Here's some ideas: