Let us choose your next solves for you
Adaptive DSA practice. We track your pattern mastery across every topic, let it decay with spaced repetition, and pick the reps that move your skill tree.
Opposite-Direction (Converging)SILVER+28
Install the extension and sync your LeetCode history. Every pattern you’ve ever touched gets a rating — the problem difficulty you clear about half the time — and a tier for how interview-ready that is.
Keep solving on LeetCode. Accepted submissions are captured in place, you rate how it went, and mastery moves — up with clean solves, down as skills rust.
Generate your reps: ten problems aimed at your weakest high-value patterns, re-served with spaced repetition until they stick.
BRONZESILVER
GOLD
PLATINUM
DIAMONDEach pattern carries an elo rating on one scale, Bronze → Diamond marks how interview-ready it is. Skip a pattern long enough and it rusts back down — your rating reflects what you can still do, not what you once did.
Debugging is the other half of the interview
98 real-world Python debugging challenges, straight out of industry debugging rounds: you get a bug report, a red test suite, and an in-browser IDE with a real terminal. Read the report, reproduce the failures, and find every bug — in upstream libraries like mako, werkzeug, and sqlalchemy, not toy snippets.
Run the suite in the built-in terminal. Watch it fail the way the bug report says it does — sims, servers, and print-debugging all run right in your browser.
Follow the failures through unfamiliar code with jump-to-definition and find-references. Peel the report’s per-bug hints only when you’re stuck.
Patch the code, rerun until green, and mark it done. Titles tell you how many bugs are planted — green plus the count means you got them all.
- 200 reps / week
- Unlimited skips
- Full problem explorer — every tagged problem
- All 98 debugging challenges
- In-browser IDE + real terminal
- Zip downloads — debug in your own editor
- Lifetime access, no subscription