Its free until July 2026. Please spread the word!

The fine print:
These sites have never made a profit. They are really good, and some people continue to use them, but as I near retirement, it just doesn't make sense to keep putting time and energy into them if income doesn't even cover the server fees. I'll cover the servers for the next two years, and see where we are at then.

2025 update: the site hasn't required too much maintance. If you can pay $1/student, that would be great and might allow me to pay the server cost and just keep things going. But if you just want to use for free and spread the word, that works too. It will definitely stay up until July 2026 - Jeff