Tapster Robotics makes robotic tools for automating mobile phones, tablets, and other connected devices with touchscreens or physical buttons. We focus on end-to-end functional tests -- interacting with a device or app like a human would. If a device or app needs to be tapped with a finger, we provide the robotic equivalent. Tapster's robot controller applications are built on open source platforms like Node.js, and can be used with other languages or platforms through an HTTP-based JSON API.