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One credit pool per day across every lab. Guest try, free tier, then two paid plans with a yearly discount. No card up front.
Not ready to commit? Try any lab free, no signup →
Try before you sign up. No card required.
Full access for serious interview prep
Daily heavy users and AI/ML engineers
Every lab costs credits based on AI compute intensity. Costs are tuned so you can always do something useful with your daily budget.
With 20 free credits, you can do ~6 coding problems, ~20 hints, or 1 interview simulation every day. Pro and Ultra scale that by 6× and 12× respectively.
Every lab costs a small number of credits based on how compute-intensive it is. Light actions like hints are 1 credit, standard problems are 3, heavy vision or multi-step labs are 5, and the interview simulation (AI-powered) is 15. Credits reset every day at 00:00 UTC.
No. Credits are a daily budget and do not roll over. This keeps pricing predictable and lets us give everyone a generous daily allotment instead of a stingy monthly cap.
Pro gives you 120 credits/day and 8,000-token responses, enough for most power users. Ultra gives you 250 credits/day, 12,000-token responses, priority access to AI-powered interview simulations, and early access to new labs. Ultra is for daily heavy users; Pro is for serious interview prep.
Two ways to try before you buy: visit any practice lab as a guest and get one free try, no signup needed; or sign up for a free account and get 20 credits every day, forever. No credit card required for either.
You'll see a prompt showing your reset time (tomorrow at 00:00 UTC) and an option to upgrade. Your existing work is always preserved.
Yes. You can upgrade, downgrade, or cancel from your account page. Changes take effect at the start of your next billing cycle. If you downgrade mid-month, you keep your higher credit limit until the period ends.
Pro is $10/month when billed yearly (vs $15/month monthly). Ultra is $19/month yearly (vs $29/month). You save around a third by paying annually.
Every practice lab gives guests one free try. No email, no card. If you like it, sign up for 20 credits a day, forever.