One pass, every lab
Pay once for a month, a year or for good. No subscription and nothing renews. The free labs and all teaching notes stay free.
1-month pass
For a single unit, a trial term or a short course.
$9.90
one month of access
- Every simulation on the site, 130 labs today
- Present mode for projecting in class
- New labs as soon as they are released
- One payment that never renews
1-year pass
For a full school year of lessons and lesson videos.
$99.00
one year of access, about $8.25 a month
- Every simulation on the site, 130 labs today
- Present mode for projecting in class
- New labs as soon as they are released
- One payment that never renews
Lifetime pass
Pay once and keep every lab, including the ones we add later.
$199.00
access for good
- Every simulation on the site, 130 labs today
- Present mode for projecting in class
- New labs as soon as they are released
- One payment that never renews
Secure checkout by Stripe. You are charged once.
Questions about passes
Is this a subscription?
No. Each pass is a single payment. It never renews and nothing is charged again.
What happens when my pass ends?
The paid simulations lock again. Free labs and the teaching notes on every page stay open, and you can buy a new pass at any time.
Can I buy a pass while one is still running?
Yes. The new pass starts when the current one ends, so you never lose days by renewing early.
What can I use without a pass?
43 labs run for everyone without an account, and every lab page keeps its teaching notes, formulas and class questions free.
Does the lifetime pass include future labs?
Yes. Every lab we release later is included at no extra cost.
How do I pay?
Payment runs on Stripe, a secure checkout that accepts major cards. We never see your card details.
I have a question about a payment.
Email us at [email protected] with the address you signed in with, and we will sort it out.