I’m building a mobile app that lets users play with face-tracking filters just like the ones you see on Snapchat or Instagram. The end result should be a set of polished, real-time face filters that run smoothly on both iOS and Android. Acceptance will be based on: 1. Accurate face tracking and expression response on current iOS and Android phones. 2. Visual fidelity matching modern social-media standards. If this sounds like your kind of build, tell me how many filters you can craft and which toolchain you prefer.