This document discusses formative assessment tools that can be used with mobile devices. It introduces Andrew Steinman, an educational technology consultant, and provides an overview of several free or low-cost formative assessment apps and websites such as Moodle, Edmodo, ClassDojo, Google Docs, Flubaroo, PiratePad, Twitter, YouTube, QR codes, Socrative, and Celly. It encourages educators to choose tools that are easily accessible, multi-platform, easy to use, affordable or free, commonly used, well-supported, and can be accessed at school. While technology can help with formative assessments, no-tech options are sometimes preferable. The document ends by asking what formative assessment tool