Copresent

Copresent is a collaborative control tool for Google Slides designed for co-presenting. After the presentation host installs the extension, collaborators can join through a shared link without registering an account. Each presenter can swipe left or right on a mobile web page to move forward or backward through slides, or advance slides and manage collaborators on a second screen. Every session has its own dedicated link, and the official statement says that slides remain in Google Slides and Copresent does not store presentations. It suits co-founders pitching together, teachers teaching collaboratively, and multiple guests taking turns speaking at a roundtable; the official claim is that up to 10 collaborators can participate at once.