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Practice, 1v1, AI builder, puzzle rush, AI tutor.
Classrooms for your CS course, free during pilot.
Evidence-linked assessments. Five participants free.
Start free with five participants, no card needed. Upgrade when you need more. Each participant is priced by the most AI their assessment allows: No-AI, Rena chat, or Agentic.
Five free participants. No card needed.
$150 of credit each month.
$700 of credit and 10% off past 40 participants/mo.
$3,000 of credit and a 10% discount baked in.
Teammates join from the personal, email-bound link sent by a workspace owner or admin.
A personal link is required
For security, each invitation is bound to one verified email address, expires, and can be accepted once.
Invitations to take an assessment are separate and open directly from their emailed links.
Have a coupon code?
A pilot or partner coupon from AlgoArena for assessment credit. Not a teammate invitation.
You pay once per participant. The price depends on the most AI the assessment allows. Modes are set per question, so one OA can mix all three.
The participant codes solo. Locking every AI surface gives a strong, deliberate signal. Best for large groups and first-round checks.
Text chat partner that talks through tradeoffs but never writes code for the participant. Tests reasoning and prompt writing.
Full agent partner. The participant prompts, and the agent scaffolds and edits. Measures the realistic senior-eng workflow.
Rack rates shown. Paid plans include monthly credit and automatic volume discounts.
Model your expected monthly mix to see which plan fits.
| Plan | Subscription | Overage | Total |
|---|---|---|---|
Starter $150 credit included | $99 | $800 | $899 $11.99 average per participant |
ScaleLowest estimate $700 credit included | $399 | $206 | $605 $8.06 average per participant |
Pro $3,000 credit included | $1,499 | $0 | $1,499 $19.99 average per participant |
Launch estimate only. Each participant is billed once, at the price of the most AI their assessment allows. Volume discounts apply automatically past each plan's monthly threshold, and overage is billed at the same per-participant rate, not a penalty rate.
Each participant is priced by the most AI any question in their assessment allows.
Upgrade to any paid plan from this page or from Usage and billing in your workspace. The free quota is 5 participants total for the life of your workspace, not a monthly or yearly allowance. Each invited participant counts as one, regardless of question count.
Each paid plan includes a monthly credit pool. Participants past it bill at the same rack rate (Starter and Scale) or with the plan's built-in discount (Pro), and volume discounts apply automatically.
Yes. Every paid workspace has a hard monthly spend cap, and we email you at 50%, 80%, and 100% of it. New attempts stop at the cap until the month rolls over or an owner or admin raises it.
You pay once per participant. The price depends on the most AI the assessment allows: $10 for No-AI, $15 for Rena, $30 for Agentic. For example, two No-AI questions and one Agentic question cost $30 per participant before plan or volume discounts.
A participant counts once they start the assessment and their attempt is submitted. If they stop partway, the attempt is submitted automatically when their time runs out, and it counts. Invites that are never opened cost nothing.