Language
JavaScript
Dynamic, async-heavy web logic
01 / Features
KEY FEATURES
01
Real-world Practice
Read and reason about real code snippets across multiple languages and difficulty levels
02
AI-Powered Feedback
An instant, detailed breakdown: what you got right, what you missed, what to work on
03
Scored on Metrics
Four axes plus a separate score for every topic in the task — not pass/fail, but exactly where you slipped
04
Personal Analytics
AI looks at every task you've solved at once and surfaces what single scores can't show: your real level, why your mistakes repeat, and a concrete plan for what's next
05
Pattern Ledger
Tracks every mistake and every strength across all your reviews: what appeared, what repeats, what you closed, and what came back
06
Progress Dashboard
Your trajectory by language, topic and difficulty — with trends and turning points: breakthroughs, dips, plateaus
02 / Practice
HOW IT WORKS
01
Choose Code
Language, difficulty, topics, and evaluation mode — normal or hardcore
02
Analyze
Read the code and explain in your own words what it does. Stuck? Hints are there, but they lower your score ceiling
03
Get Feedback
Scores per axis and per topic: what landed, what was missing, what to work on. The attempt feeds your history and your overall analysis
03 / Principles
EVALUATION AXES
Accuracy
Is what you said about the code true?
Completeness
Every key behavior, not just the obvious ones?
Clarity
Would another developer follow your explanation?
Insight
Did you get why the code is this way, not just what it does?
Plus a separate score for every topic in the task — Loops, Arrays, Strings, Async, Regex and more.
04 / Languages
SUPPORTED LANGUAGES
Language
Python
Readable scripting & data work
Language
Java
Typed, object-oriented systems
Language
C
Low-level, memory-close code
Language
SQL
Querying & shaping data