Simple, Transparent Pricing
Start free and upgrade when you're ready for unlimited practice. No hidden fees, no commitments.
Free
Perfect for trying out the platform
Lifetime access - use them whenever you want
Lifetime access for deeper understanding
Visual dashboard showing your learning progress
Access to the complete question database
Premium
High-volume practice for dedicated learners
Per month - extensive practice every month
Per month - deep-dive into concepts with AI discussions
Detailed insights into your learning patterns
Get help when you need it most
Fresh limits every 30 days
Be the first to try new capabilities
Frequently Asked Questions
How does the free tier work?
You get 10 AI-graded practice problems and 5 follow-up conversations for life. These limits never reset - once you use them up, you can upgrade to Premium for monthly usage.
When do Premium limits reset?
Premium limits reset every 30 days from your subscription date. You'll get 200 new grading attempts and 120 new follow-up conversations each month.
Can I cancel my subscription anytime?
Yes, you can cancel your Premium subscription at any time. You'll continue to have Premium access until the end of your current billing period.
What topics are covered?
We cover all major thermodynamics topics including the first and second laws, entropy, heat engines, kinetics, and much more. Both free and premium users have access to all topics.
How accurate is the AI grading?
Our AI is powered by a cutting-edge LLM and specifically trained for thermodynamics concepts. It provides detailed, accurate feedback and can understand various solution approaches.
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