What is the maximum number of survey respondents?

Hi Survey Solution,

I was wondering if there is a limit to the maximum number of surveys that can be undertaken? Some software are free up to 100 respondents before a subscription kicks in.

Survey Solutions is developed by the World Bank as a global public good. The software is free with no limitations on the usage by both public and private companies. The maximum number of interviews is determined by the parameters of the server the system is run on. The largest survey conducted with Survey Solutions was 2016 community survey of South Africa where 2.6M interviews were administered in the course of 5 months. Our tests show that an average size cloud server (E3 AWS) can handle about 10M interviews with no problems.