Yontoo is a browser extension that adds “layers” to web sites you visit, allowing you to have a “personalized” experience with any web site. Web developers create layers (apps) that enhance Internet browsers’ web experiences. Yontoo was founded by Arie Trouw, is currently run by Kai Hankison, and is self-funded.
(Founder of a San Diego-based Startup? Contact me: brant at marketbynumbers.)