Terms of Service
Last updated: October 2026
Using the site
You may use the simulations for teaching, learning and recording lesson videos, including videos you share with your students or publish online.
Free labs and passes
Some labs are free for everyone. A pass unlocks every simulation for the period you chose: one month, one year, or for as long as the site runs (lifetime). The teaching notes on every lab page stay free.
Payment
A pass is a single payment through Stripe. It does not renew and you are never charged again. A pass bought while another is still running starts when that one ends.
Your account
Your pass belongs to the account you bought it with and is for your own teaching. Please do not share your sign-in with others.
Educational models
The simulations use simplified models for teaching. They are not intended for engineering, medical or safety decisions.
No warranty
The site is provided as is. We work to keep it accurate and available but cannot guarantee it will be free of errors or interruptions.
Changes
We may update these terms as the site grows. Continued use after a change means you accept the updated terms.
Contact
Questions about these terms? Email us at [email protected].