Stream together, straight into OBS.
CoStream is the browser-based studio for multi-guest streams. Invite anyone with a link, arrange your live layout, and pipe one clean composited scene into OBS. No installs, no accounts.
Free to try — spin up a room in seconds.
FEATURED
Host (you)
Marcus
Ava
Devin
MarcusAvaDevinFrom invite to on-air in three steps
No downloads for you or your guests. Everything runs in the browser and lands in your streaming software.
Create a room & invite
Spin up a room and share the link. Guests join from any browser — no account, no install.
Arrange your layout
Switch between grid and sidebar, feature a speaker, and preview the exact scene you'll broadcast.
Grid
Sidebar
Pipe it into OBS
Copy the browser-source URL into OBS, Streamlabs or vMix and go live with one clean composited feed.
Add as a Browser Source — 1920×1080
Everything you need to run the show
A focused studio built for creators who bring guests on-stream.
Multi-guest, mesh WebRTC
Bring co-hosts and guests on stream with low-latency peer-to-peer video. Everyone connects with a single link and shows up as a clean, uniform source.
Your phone is a webcam
Open the same link on your phone to add a second angle or a crisp mobile camera — no capture card, no cables.
Grid & sidebar layouts
Switch scenes instantly and feature whoever's talking, with rounded tiles and accent framing.
OBS browser source
One composited output URL drops straight into OBS, Streamlabs or vMix — no plugins.
Host controls
The room creator moderates — remove a guest in one click and keep the stage in your hands.
Zero install, instant join
No apps, no downloads, no sign-ups. Open a link, allow your camera, and you're in the studio — on desktop or mobile.
Drops right into your streaming software
CoStream renders a single 1920×1080 scene you can add as a browser source anywhere.
Host
AvaMarcusReady to go live together?
Create a room, drop the link to your guests, and start streaming in under a minute.
Go live together