CodeCrush Pro vs Quarry

Practice coding interviews anywhere with CodeCrush — a clean, focused app built for learning data structures and algorithms in Python. Solve Real Problems 85+ hand-picked problems across Easy, Medium, and Hard — covering arrays, strings, trees, graphs, dynamic programming, linked lists, and more. Each problem includes examples, hints, and an optimal solution explanation. Write Code, Get Instant Feedback A built-in Python editor with syntax highlighting, a real-time linter, and pinch-to-zoom font sizing. Run your code against test cases and see results instantly. Stay Consistent with Daily Challenges A new challenge every day to keep you sharp. Build streaks, filter by difficulty, and share your progress with friends. Track Your Growth Earn XP across skill categories like Arrays, Trees, Dynamic Programming, and more. Level up skills, unlock achievements, and see your progress on a detailed profile. Features: - 85+ coding problems (Easy, Medium, Hard) - Python code editor with syntax highlighting - Built-in Python linter - Instant code execution with test cases - Daily challenges with streak tracking - XP system with skill-based leveling - 18 unlockable achievements - Hints and solution explanations - Difficulty filtering - Share streaks and solutions - iPad support - Works beautifully in dark mode Whether you're preparing for technical interviews or just love solving problems, CodeCrush makes it easy to practice a little every day.

Quarry is a focused, offline gym for data and coding interviews. 108 hand-picked problems across SQL, pandas, and Python — write real code, run it on your device, and get graded instantly. Everything runs on-device. The SQL and Python engines are built into the app, so there's no sign-up, no internet requirement, and nothing you write ever leaves your phone or iPad. Practice on a plane, on the subway, or anywhere. WHAT'S INSIDE • 108 problems across three tracks: SQL queries, pandas data wrangling, and Python algorithms & data structures. • Real execution, real grading. Your output is checked against the expected result — no self-marking. • Company tags. Filter problems by the company you're interviewing at. • Hints and full solutions when you're stuck. • Difficulty levels from Easy to Hard, grouped by topic. • A free-form Playground for scratch SQL and Python. • Universal app — designed for both iPhone and iPad. PRIVATE BY DESIGN No accounts. No analytics. No ads. No tracking. Quarry collects nothing and works fully offline. Whether you're prepping for a data analyst, data engineer, data scientist, or software role, Quarry gives you a quiet, fast place to actually practice.