Pricing That Scales With Your Ambition

AlgoArena has three plans. Free is $0 forever and covers unlimited battles, practice problems, the ranked ladder, a one-time $1 of builder AI credits, 5 free AI credits a day in the builder (up to 30 a month), and Module 1 of Practical Vibecoding. Pro is $12.99/month and adds unlimited AI Analysis, Rena chat, mock interviews (8), $8 of shared AI credits for Rena and the builder, stronger models in the builder, and 5 free AI credits a day in the builder on top of those. Ultimate is $25.99/month with unlimited mock interviews, $30 of shared AI credits for Rena and the builder, Student Copilot, and the full Practical Vibecoding course. Yearly billing saves about 36% on Pro and 30% on Ultimate.

Yes. The free plan is $0 forever with no credit card, and it includes unlimited battles, practice problems, the ranked ladder, and 1 AI Analysis of your solutions a day, plus 5 Rena hints a day while you practice. Full Rena chat and mock interviews live on the paid plans, but you can compete and practice as much as you want without paying.

Rena is AlgoArena's built-in AI coach. It chats through problems with you as you solve them and runs full mock interviews so you can practice out loud before a real one. Rena chat and mock interviews (8 per month) come with Pro. Ultimate removes the mock interview cap. On both plans, every Rena chat message uses AI credits. On Ultimate, Rena also reads your code inside the Learn lessons. When a run does not pass, she looks at what you actually wrote and tells you what is going wrong, without writing the answer for you. The lessons themselves stay free on every plan. Rena chat and the builder share one monthly AI credit pool ($8 on Pro, $30 on Ultimate). When that pool runs out, you can enable on-demand usage. The free plan still gets AI Analysis, automated feedback on your solutions after a match, and 5 Rena hints a day while you practice. Hints explain and nudge but never write code.

AI credits are the shared dollar pool that powers Rena chat and the builder. Free gets a one-time $1 for the builder only (no Rena chat). Pro includes $8/mo and Ultimate includes $30/mo, both resetting at the start of each calendar month while you stay subscribed. If you burn through the included pool on a paid plan, you can turn on on-demand usage with your own spend limit. Every plan also gets 5 free AI credits a day in the builder, spent first on any model. They reset at midnight UTC and don't carry over. The free plan stops at 30 a month.

There are two paths. If your school, bootcamp, or club hands out an AlgoArena institution access code, you can redeem a free year of Ultimate right on this page, with no checkout and no credit card. If you teach a CS course, AlgoArena Classroom is free during the current pilot and gives you live sessions, question variants, and progress for each student. See classroom pricing at /classroom/pricing.

Yes! You can upgrade or downgrade your plan at any time. Changes take effect immediately.

We accept all major credit cards (Visa, MasterCard, American Express) through our secure Stripe payment processor.

Absolutely. No contracts or cancellation fees. You can cancel your subscription anytime.