Alpha History is a free online textbook and resource centre for history teachers and students. Alpha History spans 11 popular historical periods – from the American Revolution to the Troubles in Northern Ireland – with more under construction for 2014/15. Each section contains hundreds of resources including topic summaries, documents, images, maps, timelines, biographies of significant individuals and historiographical information. Alpha History also contains a range of online activities, such as quizzes and crosswords. All content at Alpha History is written, reviewed and chosen by qualified teachers, writers and historians. Alpha History is suitable for students at high school (15+) and undergraduate levels. Alpha History also develops and publishes low-cost mobile applications for the Apple iPad, iPhone and iPod Touch.