Link to Show HN: https://news.ycombinator.com/item?id=17254737
Ask for credit card data while signing up for the trail period. People that are possible customers don't really mind entering their CC. I did a test with my project Simple Analytics when number one on HN and free people did signup like 50 an hour. Than I cancelled those and paid people came in. Guess how many of those 50 did convert? Zero.
So ask for credit card info first, give a trail for x days and charge monthly automatically.
Your design is awesome ;-)