Smart Learning promises the connection between formal and informal learning, but how to offer informal learning tasks related to formal learning is still a challenge. This demonstration paper presents CasualLearn, a smart learning application that bridges formal and informal learning to learn History of Art in the Spanish region of Castile and Leon. CasualLearn uses a dataset of 16,221 contextualized informal learning tasks that were semi-automatically created exploiting Open Data from the Web. CasualLearn offers these tasks to students based on their context: their geolocation, the activity they do and the topics covered in their formal education. A demo application is currently available for Android devices.