Vidyo.io does not limit the number of participants in a single call. You can have calls that are only two people and go up from there. The number of viewable participants however is limited based upon the endpoint device’s capability as it relates to CPU, available bandwidth, and screen resolution to render the video. For example, a PC can support up to 16 participants on screen. Mobile devices will likely support less due to limited bandwidth, CPU, and screen resolution.
Vidyo.io uses automatic voice detection and switches the video tiles. The most recent active speakers will be displayed on screen and any participants not visible, will automatically get promoted into the viewable tiles when they generate audio. The result is always seeing the most recent speakers on screen.