Built on proof. Not vibes.
Two obsessions drive AceLoop: verified content and scientifically-timed repetition.
Nothing reaches you unverified.
Every problem — curated or AI-generated — passes this gauntlet before you ever see it.
Authored
A problem is written with a reference solution and a full test suite.
Solved
The reference solution must solve its own problem — completely.
Executed
It runs against every test in the real sandbox, in the real language.
Shipped
Only a 100% green run is published. Anything less is rejected.
tests executed and passing
problems in the verified catalog
green before publish
Beat the forgetting curve.
You forget half of what you learn within days — unless you review at exactly the right moments. AceLoop schedules those moments for you.
- Every solved problem becomes a review card
- FSRS picks the moment you're about to forget
- Five focused minutes a day keeps everything green
We never grade by vibes.
There is no “the AI thinks it's correct” here. If the sandbox says Accepted, your code ran and passed. That's the whole story.
Designed to keep you coming back.
Streaks
Separate practice and learning streaks, freezes included — momentum you can see.
Daily review
A five-minute morning ritual that compounds into mastery.
Leagues
Weekly brackets against people at your level. Climbing feels good.
Proof beats hope.
Train on a system that never lies to you.
Free forever plan · no credit card