In 2013 OSHWA conducted a survey of the international open source hardware community, which received 1,007 responses. We’ve shared the aggregate results! You can download the master files, or use the graphs we’ve created. A big thanks to our Research Chair, Catarina Mota, for making the survey and the data possible.
The survey results can be found under our Research tab (along with data from 2012), or simply follow this link: https://www.oshwa.org/oshw-community-survey-2013/
It’s again dependent upon the type of app you determine to build.