🧪 Free streaming overlays · built live, in public
Stream overlays that
actually look good.
Castkin is a lab of free, customisable overlay tools for streamers. Design it in your browser, drop it into OBS, go live. No download.
The Lab
4 live · 1 coming soonCountdown
Starting soon / BRB timer
A clean animated countdown for your 'starting soon' and 'be right back' scenes. Fully customisable, drops straight into OBS.
Customise it →Goal Bar
Followers · subs · donations
An animated progress bar to rally your audience toward a target. Hook it up to live events later.
Customise it →Alert Box
Follows · gifts · subs
Pop animated alerts when someone follows, gifts, or subscribes — with a test-fire button while you design.
Customise it →Chat Box
On-screen chat overlay
Show your live chat on stream with themed message styling that matches your brand.
Social Ticker
Handles & now-playing
A lower-third ticker for your socials, schedule, or the track you're playing.
Customise it →Need the kit behind the overlays?
Our Gear Builder specs your whole streaming setup to your budget.