We presented an educational activity based on marker less images for kindergarten and an augmented reality book. These works were developed using Aurasma. It was also presented an activity for music teaching using marker based codes. We used smaller Microsoft tags that are better recognized than the Quick Response codes. Finally, we prefer to use the Augment application to show 3D models on top of a QR code. The example presented helps students to visualize the 3D model and draw the orthographic or the isometric views.