I use Outseta (who in turn uses Stripe) to process subscription payments and to handle your logins, account management, etc. I use them because I know enough to stay in my lane and let the experts handle your credit cards.
For long time users of the site, it might be a bit surprising to see this page. The low-key donation model I used for years certainly felt good to offer, and I’m grateful to all who gave. But to spend the time needed to make this site the best it can be, I need more than the donations were providing.
I know that not every teacher can afford to pay, and I don’t want anyone to be shut out entirely. That’s why even the free tier still gets all of the graph types and lasts as long as you need it.
Yes, you can upgrade or downgrade later.
Yes, I’ll reward you if you donated to the old site.
Subscriptions auto-renew, but yes, cancelling is easy.
Use all graph & grid types
Use all 40+ built-in functions
Contains ads
Delayed downloading and copying
Educational use only.
Use all graph & grid types
Use all 40+ built-in functions
Ad-Free
Immediate downloading and copying
Commercial Use Allowed
Sign Up NowUse all graph & grid types
Use all 40+ built-in functions
Ad-Free
Immediate downloading and copying
Save favorite grid settings
Save favorite plot styles
Use custom font for graph texts
Customize available colors, line widths, etc.
Commercial Use Allowed
Sign Up Now