Toky supports two major browsers with a combination of more than 70% of the browsers market share in the world. These are Google Chrome and Mozilla Firefox. Opera is also supported even though its usage is minimal.
In order for Toky to work, the browser has to support a technology called WebRTC, which is very recent and makes possible to call and receive calls securely without having to download any extra software. This is what makes Toky convenient.
Safari and Internet Explorer aren't supported because they have yet to catch up with the adoption of these new standards that make the modern web we all use.