Who can use the CO2 fit app? Changers Support December 15, 2016 09:44 Updated Follow All those who own a smartphone with Android or Apple iOS operating system. For employees in companies we have a webservice. Related articles What does the Changers CO2 fit app cost? Password reset doesn't work How does the app differentiate between mobility types? How does the app measure the kilometers? Comments 0 comments Please sign in to leave a comment.