You can select whether you want to to pay monthly or yearly for your Sumo Pro subscription. Yearly is a 40% discount vs. monthly!
When you get to the checkout page, notice the top section:
If you select the top option, this is the yearly plan with the 40% discount. The second option is the monthly plan.
You can also switch between monthly and yearly plans if you want to later on. Check out our article that covers how to do this.