What happens when every page becomes a place?
Rooms
Live presence and chat on every URL. No setup.
The Score
A live confidence signal on what you’re looking at.
Annotations
Highlight anything. Attach a note, a flag, or a fact check.
Ten floors deep
Ten sublevels, SL001 to SL010. The deeper you go, the more you can do.
Badges
Be first in a room. Mint a Badge. Own a piece of the web.
Baselings
An AI teammate on every page. It reads what you read.
We’re building the
annotated internet.
Two minutes on why every page deserves a room, a record, and a reputation.
The annotated internet starts here.
One layer across every device. Your rooms, your signal, your Locker, always in sync on Mac, Windows, and iOS.
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Coming Soon
IRL Stickers
With IRL Stickers every person, landmark,
coffee shop, lamppost, statue, or bus also has
a Basement to chat in. Stick them anywhere!
Everything you might want to know
Basement is a social layer on top of the web. Any webpage you visit gets a live room, annotations you can read and add, and an AI teammate that already knows the page. It works on news articles, product pages, research papers, pull requests, anywhere with a URL.