Thank you for your interest in our courses!
The main difference between the two options is that the Offline Course is a download of our curriculum that you can use on your device while not connected to the internet. The Offline Course also does not come with all of the features of the Online Course. There is no completion certificate, newsletter, student interaction, automatic grading, etc. The Offline Course is a collection of downloadable files to use on your own while the Online Course is an interactive course and community. However, the curriculum the the same between the two options.
You can see all the features of the Online Course here: http://online.startasl.com and what's included with the Offline Course here: http://offline.startasl.com.