Quarry vs Codebasics

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.

Codebasics is the mobile companion to codebasics.io — the e-learning platform trusted by 700,000+ learners and 1.5 million+ YouTube subscribers to build careers in Data Analytics, Data Engineering, and AI Engineering. Whether you're just starting out or upskilling for your next role, Codebasics turns daily practice into real career progress — one skill test, one mock interview, one flashcard at a time. WHAT YOU CAN DO • Career Suitability Test — Answer a few questions to find out which path fits you best: Data Analyst, Data Engineer, or AI Engineer. • Daily Skill Tests — Sharpen your Python, SQL, and Machine Learning skills with 5 new questions every day. Everyone gets the same set, and it rotates through the full question bank over time. • Mock Interview Practice — Practice like it's the real thing with 10 daily questions per career path (5 core + 3 scenario-based + 2 behavioral). • Daily Flashcards — Get one revision flashcard per module every day, tailored to your chosen career path, for quick daily reinforcement. • Bootcamps & Resources — Browse curated learning materials, guides, and Codebasics bootcamps to go deeper on the skills you need. STAY MOTIVATED • Earn XP for every correct answer and every perfect score, and level up from Beginner all the way to Master. • Build a daily streak by practicing every day — miss a day and it resets, so keep coming back. WHY CODEBASICS Codebasics has helped hundreds of thousands of learners — including career switchers and non-IT professionals — land roles at companies like TCS, Deloitte, Oracle, and EY. With instructors bringing 12+ years of industry experience and a track record of 7,000+ five-star reviews, Codebasics is built to get you job-ready, not just certificate-ready. Sign in with your Codebasics account to sync your progress, XP, and streaks across devices. Have questions or feedback? Visit codebasics.io or reach out through the app.