ARSnova is Open Source: the software is free and open source for individual modifications and upgrades. Also, the online service, arsnova.eu/mobile is free of charge for public educational institutions.
As a web-based service, the connection, reaction time of submissions and the maximum number of simultaneous users depends on the quality of the wireless network (Wi-Fi). Experience has shown that between 50-70 users can work simultaneously per access point, unless other online services such as WhatsApp, YouTube and Twitter are being accessed at the same time. In addition, in the course of a day, mostly in the morning hours, the European server is frequented by hundreds of teachers and students (see the latest usage statistics), which means that the optimal performance of arsnova.eu/mobile cannot be guaranteed.
Also, due to privacy reasons, it is preferable to operate ARSnova on one’s own server, even though the European server is located in Germany; see the Privacy statement to ARSnova.
In case you are interested in technical support, please contact the Project Manager Prof. Dr. Klaus Quibeldey-Cirkel.