Google Classroom was announced on May 6, 2014, with a preview available for some members of Google's G Suite for Education program.[2][3] It was released publicly on August 12, 2014.[4][5] In 2015 Google announced a Classroom API and a share button for websites, allowing school administrators and developers to further engage with Google Classroom.[6] Also in 2015, Google integrated Google Calendar into Classroom for assignment due dates, field trips and class speakers.[7] In 2017, Google opened Classroom to allow any personal Google users to join classes without the requirement of having a G Suite for Education account,[8] and in April of the same year, it became possible for any personal Google user to create and teach a class.[9][10]