Start free. Stay fast.
The catalog, the judge, the mentor and daily review are free. Credits only power heavy AI generation.
Explorer
Map your first skill, free forever.
- 1 active goal
- 20 AI lessons / month
- 5 lesson redesigns / month
- Fast, capable AI lessons
- AI mentor — 30 messages / month
- Spaced-repetition review & progress tracking
Navigator
Go deep on everything you're learning.
- 5 active goals
- 150 AI lessons / month
- 30 lesson redesigns / month
- Smarter AI for deeper, richer lessons
- Unlimited AI mentor
- Mock interviews with rubric feedback
Cartographer
Learn at full speed, no friction.
- Unlimited goals
- 500 AI lessons / month (fair-use)
- 100 lesson redesigns / month
- Our most capable AI on every lesson
- Unlimited AI mentor & mock interviews
- Top-priority generation
Need more? Top-ups: 40 for $5 · 120 for $12 · 300 for $25 — they never expire.
Always free, on every plan
What would you spend?
Drag the sliders — we'll point you at the right plan.
Questions, answered.
Only heavy AI generation: an AI lesson (2), a custom generated problem (1), a mock interview (2), a lesson redesign (2). Solving, running code, hints on catalog problems, mentor chat and review never cost credits.
Yes — all 250 verified problems, unlimited runs and judging, the mentor, and daily review are free forever. The 40 monthly credits cover roughly 20 AI lessons, or a mix of lessons and interviews.
Everything free keeps working. For more generation, top up (from $5, credits never expire) or upgrade — your bundle refills monthly.
Yes. Upgrades apply instantly, cancellations at the end of the period. Unused top-up credits stay yours.
Yes — in an isolated sandbox with real compilers for all 13 languages. Verdicts, runtime and memory come from actual execution, never from an AI guess.
Free to start. Hard to outgrow.
Join now and solve your first verified problem in minutes.
Free forever plan · no credit card