What is the difference between the single payment vs the bi-weekly payment plan?

You have access to the same material in both plans. The one-time payment is $499. The payment plan is four payments of $150 ($600 in total): the first is charged when you enroll, and the other three are charged automatically every 15 days after that. You pay a little more with the payment plan. Paying in full also unlocks Course Bundles at checkout. If you graduate before you complete paying all four payments, you are still liable for making all the payments.