A stream overlay is the graphics layer on top of a live broadcast — frames, alerts, goal bars, and on-screen counters showing followers or subscribers climbing in real time. In broadcast software like OBS, each element is typically a web page added as a browser source with a transparent background.
The on-screen counter
Follower-goal and subscriber-count widgets are overlay staples because they turn support into visible progress: a viewer follows, the number moves on screen, the streamer reacts. The mechanics are the same as any live counter — polling plus animation — rendered transparently over the game or camera.
What makes a good one
- Legible at a glance (streams are watched on phones).
- Honest numbers from real platform data, not simulated ticks.
- Light enough not to cost frames.
An embeddable overlay version of our counters is on the roadmap; today, streamers point a browser source at a channel's live counter page for the same effect.