Let us help answer the most common questions you might have.
Just a browser and access to your device's camera (most laptops, tablets, phones... perhaps even a smart TV).
Bunkai uses motion capture to provide you with real-time feedback and other features, meaning the (browser) app has to be able to see you in order to be useful.
Only you. All recordings for that are stored locally (i.e. in your own browser), and if you're going to upload video elsewhere it'll be because you specifically asked for that to happen.
We've been asked a number of times already. Not currently, although we might revisit this for the right opportunity.
Not currently, although we've already had some interesting conversations in that direction. We can add custom skins.
Absolutely not. Should we ever decide to sell any data, it'll be completely anonymized and our T&Cs will reflect that.