Quarry: SQL & Data Interview
Offline Data Engineer Practice
About
Practice data engineering interviews offline with real SQL and Python coding. Get instant grading, detailed feedback, and company-style problems. Features daily challenges, progress tracking, and a free-form playground.
What's New in Quarry
1.2
November 11, 2026
• Today's problem: one a day, on Home and in a new Home Screen and Lock Screen widget • Streaks, a daily goal and an optional daily reminder • 20 new problems (188 in total) • Accent colours and code editor themes • Quarry Pro: every Medium and Hard problem, a review queue and every future pack. Every Easy problem stays free.
MoreSubscriptions & In-App Purchases
Yearly
Every Quarry Pro problem and future pack.
Developer apps
FAQ
What is Quarry's learning methodology?
Quarry focuses on hands-on practice with real SQL and Python coding. It provides instant grading and detailed explanations for why solutions are correct or incorrect, mimicking real-world problem-solving.
How does Quarry track user progress?
Quarry offers daily problems, streaks for consistent practice, and a daily goal feature. Users can also utilize a review queue in Quarry Pro to revisit problems they found challenging.
Does Quarry offer certifications?
Quarry does not offer formal certifications. Its primary focus is on providing practical interview preparation through coding exercises and instant feedback.
What are the pricing details for Quarry Pro?
Quarry Pro is available through a monthly subscription ($2.99/month), a yearly subscription ($19.99/year), or a one-time lifetime purchase ($29.99). These are auto-renewing unless cancelled at least 24 hours before the current period ends.
Is Quarry safe for all ages?
Quarry has an age rating of 4+. The content focuses on technical interview practice and does not contain inappropriate material for younger users.
How often is Quarry updated?
The latest version, 1.2, was released on 2026-11-11, indicating active development. Updates typically include new problems and features to enhance the practice experience.
What devices does Quarry support?
Quarry is designed for iPhone and iPad, including iPhone Duo. It functions entirely offline on your device.
Does Quarry have ads?
No, Quarry is designed to be private and does not have any advertisements. It collects no user data and works fully offline.
