Collabrify PDFpal is a “collabrified” PDF markup tool. Students can work solo or students can work together, synchronously, in realtime, to markup a PDF file, e.g., a worksheet. PDFpal is truly easy to use: it only has four tools: pen for line drawing, text for typing, eraser for erasing, and highlight marker for highlighting. That’s is! Scan in your worksheets and you are ready to go! Use PDFpal and the other apps in the Collabrify Suite to “collabrify” your classroom!