Solution: I decided to make my own debt calculator. It compares the time and amount of interest paid if you were to pay the minimum payments for the life of each loan versus three debt pay-off methods: Debt Avalanche, Debt Snowball, and Debt Spiral. I made it in Google Sheets so that people could download their own copy and keep the results without worrying that they were downloading a virus.
When you click on the link above, it'll take you to this page.
If you have questions about how to use it, find any bugs, or have any feedback about features that you would like, please leave a comment here.