60%
Teachers are already using AI for work.
Weekly users estimated 5.9 hours saved per week.
Gallup 2025 · 2,232 U.S. public-school teachersLoading page
https://algoarena.net/classroom/lobby/classroom_intro_cs_demo
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CS2026
Game Settings
Questions
6
Time
10s to 20m per question
Topics: arrays, linked lists, strings
Waiting for a student to join...
Players
1 joinedNPNoah Parkready
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Classroom join
Enter the 6-character code from your host, then join the live room.
Classroom
The CS classroom, rebuilt for the AI era.
Host live algorithm quizzes, let students code in the room, and debrief the exact concepts that need attention.
Piloted in a Bryn Mawr College CS classroom. Free to start with a generous educator free tier.
Classroom pilot
Piloted in a Bryn Mawr College CS classroom.
Classroom is shaped around an instructor's real loop: start class quickly, see who is stuck, and leave with a useful debrief.
The classroom control gap
Shared visibility matters more than another black box.
Teachers and students are already using AI. Classroom gives the educator a visible role in setting boundaries, seeing progress, and choosing the next explanation.
18%
Formal workplace guidance is lagging.
Only 18% reported receiving formal guidance on AI use.
Gallup 2026 · 2,069 U.S. public-school teachers56%
Students are bringing AI into the room.
Gen Z K-12 students use GenAI weekly. 80% of surveyed Gen Z worry AI may make future learning harder.
Gallup 2026 · 1,572 U.S. people ages 14 to 29One live teaching loop
From first join code to the next lesson.
Four focused views show what the educator can control, what the student can ask, and what the class leaves behind.
Live room
Host the whole class from one screen.
Share a short join code, keep everyone on the same question, and watch submissions land without switching dashboards.
Host a classroomLive question
Question 3 of 5
What is the main advantage of a linked list over an array?
Students answered1 / 3
Watch answers land, then reveal and debrief.
Teacher-gated help
Coach without giving away the answer.
Hint-only Rena stays beside the coding task, follows the teacher's policy, and refuses requests for full solutions.
Set classroom guardrailsHint-only Rena
Teacher policy
Can you just show me the solution?
Rena
|
Full-solution request blocked by classroom policy.
Concept gaps
Choose the next explanation from evidence.
Inspect class accuracy by concept and turn the weakest signal into the next worked example or a topic for office hours.
View the educator dashboardConcept gaps
Class accuracy by concept
Dynamic programming is your next office-hours focus.
Reusable material
Turn one live session into the next lesson.
Find a past quiz, inspect its question mix, and reuse what worked instead of rebuilding every warm-up from scratch.
Browse classroom materialReusable library
Search your saved quizzes
Drop a past quiz straight into your next class.
Frequently asked
With a short join code on any device. No install, no full account required. They answer from their own screen while you watch progress live.
Recent from the field notes
All field notesAssessments2026-09-23
Run Tests Checks What Submit Checks
Run Tests on an algorithmic assessment question now grades the hidden cases too and shows one pass count, and a program that crashes shows as a runtime error with its traceback.
ReadAssessments2026-09-21
Approve Once, Publish From the Card
In Assessment Copilot, an approved assessment now goes live from a Publish button on its card, and a card you have approved or dismissed stays that way.
ReadAssessments2026-09-19
Questions That Hand Out an API Key
A question can now hand each participant a working API key, kept out of the question text and set up on a machine that can reach the internet.
ReadFor educators
Run live CS sessions your whole class can join.
Host live sessions, coach with hint-only Rena, debrief with real data, and reuse quizzes across classes.