In the mobile app, Strava has a great "Progress" section in which one can compare the monthly accumulation of time or distance spent on each sport to the last month. Add an option to switch last month to same month last year.
In outdoor sports (e.g. cycling), the seasonal comparison is much more useful than month to month. E.g. it is quite normal that on spring each month I will increase the time on bike. What is interesting - am I doing more this April than the last year's April? That would be a progress.