Before onboarding our cohort retention was 2%...after 1 week.
This means that after a week only 2% of our users came back to use the app.
After a basic onboarding we jumped to 10%. We're now at about 14-15% (just via improving the app).
About 50% of our users completely skip the onboarding altogether.
I think I'm going to experiment with a video instead of a tour to see the difference.