We pro-rate the Annual charge based on the remaining days of the monthly subscription. So if you sign up on the first of the month, and upgrade to Annual on the next day, you would get about $28 off of your Annual subscription. If you instead switched to Annual on the 30th day of the month, you would get about $1 off of your Annual subscription. Your billing date would be changed to the date you upgraded to Annual. 👍
If you would like to try out some of our products and assets, you can always try our free plan.