Score and summary
68 - Nice job
The result screen summarizes how much of the review you covered and where your reasoning can improve.
Learn to catch what AI gets wrong
AI writes code fast, but it also writes bugs, security holes, and technical debt. Train your eye to spot the risks before they ship.
100+ Curated Challenges
New Challenges Added Regularly
Expert-Authored Rubrics
review-challenge.tsx
// AI-generated code: Review for issues
async function processPayment(userId, amount) {
const user = await db.query(
`SELECT * FROM users WHERE id = ${userId}` // SQL Injection!
);
return chargeCard(user.card, amount);
}Choose a language and open a starter challenge
Start with a focused challenge before moving into the larger library.
Why this matters now
AI changed coding. Developers now need to catch machine-generated drafts that look correct, pass shallow tests, and still violate product intent.
Code review is becoming a standard part of technical interviews.
Real Bug Patterns
Practice on believable AI-generated code with hidden logic bugs, missing edge cases, unsafe assumptions, and broken tests.
AI-Era Review Instincts
Train yourself to slow down, read intent, and challenge code that looks plausible but violates the scenario.
Security Focus
Spot leaks, trust-boundary slips, unsafe fallbacks, and AI-written shortcuts before they become production risks.
Expert-Authored Rubrics
Authored issues, reasoning points, and explanations stay the source of truth. AI checks your submitted findings against them.
Skill Tracking
Track completed challenges, scores, strengths, missed patterns, and progress across the growing library.
No PR-like interface
No simulated GitHub dashboard. Just the code, your findings, and honest feedback after your submits.
How it works
Practice the review loop developers need when AI writes the first draft.
01
Open a realistic scenario
Start with product context, code, tests, and hidden issues that feel like everyday engineering work.
02
Hunt for the hidden failures
Read the code, tests, and product context. Add findings inline or from the review console.
03
Calibrate your judgment
Submit your findings for AI feedback, then see whether your review caught the authored hidden issues.
04
Reveal the full review
Finish the attempt to see what you caught, what you missed, and which review habits to sharpen next.
What you see after submit
Results show your score, matched findings, reviewer feedback, and learning paths. Pro adds the missed-answer reveal with fix direction.
Result screen preview
Matched finding
Good catch: pagination drops valid records
Accepted findings show the issue you caught, how your explanation was understood, and reviewer feedback on your note.
Pro answer reveal
Missed issue and fix direction
Pro can reveal authored missed answers, why they matter, and the fix direction after the attempt.
Practice with purpose
Free gets you started. Pro shows you what you missed.
Free
$0
AI-reviewed findings5/day25/month
Hints2/day8/month
- Challenge library access
- Score and matched-finding feedback
- Authored hints
- Progress tracking
Pro Monthly
$9/month
AI-reviewed findings50/day500/month
Hints30/day150/month
- Challenge library access
- Score and matched-finding feedback
- More authored hints
- More AI-reviewed findings
- Progress tracking
- Full post-attempt answers
Best Value
Pro Yearly
$79/year
$6.58/moSave $29
AI-reviewed findings50/day500/month
Hints30/day150/month
- Challenge library access
- Score and matched-finding feedback
- More authored hints
- More AI-reviewed findings
- Progress tracking
- Full post-attempt answers
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