Swipe through original interview problems. Explain your approach in plain English. Get graded by AI in seconds. Master a problem every 3 minutes.
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Given a sorted array of positive integers and a target, find the pair whose product is closest to the target.
Every problem original. Zero LeetCode reprints.
The 3-minute reality
Interviewers decide while you explain your approach. Not while you type.
45-minute interview · drawn to scale
session_trace.log
ScrollCoder trains only the glowing five minutes, at 20× the reps per hour.
A real problem from the live catalog, graded by the real AI. No account needed.
Pattern recognition is a volume game. This is what volume looks like.
2 problems. Pass/fail feedback.
20 patterns drilled. Reasoned feedback on every single one.
Yes. 3 problems a day free, with unlimited retries and no credit card. Pro is $9/month for unlimited problems. You can even try 3 problems right on this page without an account.
No. You describe your approach in plain English, the same way you'd explain it to an interviewer. That's the skill interviews actually grade: recognizing the pattern and articulating the solution. Syntax is the easy 95% you already know.
LeetCode trains implementation: 30-45 minutes per problem, most of it typing. ScrollCoder trains recognition: 2-3 minutes per problem, 20+ patterns per hour. They complement each other. But if your bottleneck is "I stare at the problem and don't know where to start," volume of recognition reps is what fixes it.
Every problem is original: generated, then validated by a reasoning model that independently re-solves every example before the problem ships. Nothing is reprinted from LeetCode, so you can't pattern-match on memorized titles.
Every problem is graded against a pre-built rubric (canonical solution, accepted alternatives, common partial answers) rather than the model's mood. Grading is deliberately generous with informal phrasing. It can still miss. When it does, the verdict comes with reasoning, so you can see exactly why and judge for yourself.
Train for them.
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