The calculator stays free. Pay only if you want your imported scores, rankings, and leaderboard in one dashboard.
What you get with a membership
Adds 1 month from your current end date (or from approval).
Paid Sep 1–Jan 31: 1st semester (access Sep 1–Jan 31). Paid Feb 1–Aug 31: 2nd semester (Feb 1–Aug 31).
Full academic year: 1 September through next 1 September.
Secure checkout via Paddle. See our refund policy for cancellation details.
Break periods
If you subscribe during a summer or winter break, your access ends with that semester only—it does not roll into the next semester. You will need to subscribe again when the next period starts (for example, after 31 August or after 31 January, depending on when you paid).