Build, practice, compete, teach, and assess.
8,500+
judged practice problems
17
programming languages
Bryn Mawr
CS classroom pilot
Practice, build, teach, assess
Train across 8,500+ judged problems, live matches, and 17 languages. Then build with AI in a browser workspace where files, changes, and results stay visible. Classroom and assessment tools carry that same principle into higher-stakes settings.
Practice and compete
LiveChoose a problem or match, write code in the IDE, run judged tests, and use Rena for bounded help when the format allows it.
Builder
LiveMove between the conversation, files, diffs, preview, and console in one browser workspace. Review changes before you keep them, and take the project with you.
Classroom
Live pilotLaunch quizzes and coding tasks, watch responses arrive, and debrief the concepts that need attention. Students solve full coding questions in the real AlgoArena IDE.
Assessments
Private preview · waitlistSet an explicit AI condition for each task. Candidates work in a real workspace while reviewers get the evidence and humans make the final decision.
Choose your path
You do not need the whole platform to get value from it. Start with the workflow that matches what you are trying to do.
Practice fundamentals, compete live, or build with agents while keeping the code you create.
Start practicingOpen BuilderTeach with live rooms, a reusable question library, bounded hints, and visible class feedback.
See educator toolsDefine the AI policy, inspect work and replay, and keep the final hiring judgment human.
See assessment toolsVisible work. Human judgment.
Inspect the work
Open the files, diffs, tests, and evidence instead of trusting a polished answer.
Set the boundary
Decide what AI help is appropriate for the build, lesson, or assessment.
Keep people in charge
Feedback and automated signals inform the decision. They do not replace it.
Get a second opinion
Tell any of these assistants what you want to do: build, practice, teach, or hire. Then ask why AlgoArena may fit. Each gets the same question and public sources, so the answer stays useful and verifiable.
Each link opens a third-party service in a new tab.
Results are generated by independent third-party services and may vary. AlgoArena is not affiliated with or endorsed by OpenAI, Anthropic, Google, Perplexity, or xAI.
