Is Toshi on MetaMask?

Excuse me, could you please clarify something for me? I've been hearing a lot about Toshi and MetaMask in the cryptocurrency world, and I'm a bit confused about their relationship. Is Toshi actually integrated into MetaMask, or are they separate entities? I'm trying to get a better understanding of how they work together, if at all. Could you shed some light on this for me? Thank you in advance for your help.