SQL Challenge
Feed your brain. Query up.
€2.99 · Designed for iPad. Not verified for macOS.
Feed your brain. Query up.
Learn SQL the way you will actually use it: one query at a time, against a real database, right on your phone.
SQL Challenge is a single path of original questions. Each level hands you a small database and asks for one thing, and you answer with one SELECT. A real SQLite engine ships inside the app and runs your query on the spot — no server, no signal, no waiting.
Then it runs your query again on rows you have never seen. Hard-code what was on the screen and you will hear about it. That is the whole difference between a query that looked right and a query that is right.
Free to start: the opening levels are free, then unlock the full path with a single one-time purchase. No subscription, no ads, no account.
WRITE REAL SQL
• A keyboard built for queries: a clause row for SELECT, FROM, WHERE, JOIN, GROUP BY, ORDER BY and the aggregates, and a toggle that upper-cases keywords while leaving your table and column names exactly as typed
• A schema panel above the editor: every table with its columns, their types, the row counts, and the first rows to look at
• A result sheet that puts your table next to the expected one, so you can see which rows are extra, which are missing, and which column came back under the wrong name
FIVE WORLDS TO QUERY
• Five invented databases, none of them borrowed from a tutorial: an online shop, a school, a library system, an airline and a music service
• Hidden variants of the same schema — an empty table, a tie at the top, a NULL where you assumed a number, a row with nothing to join to — decide whether you answered the question or just the screen
LEARN THE RIGHT WAY
• Three tiers of hints from Tuple, a cyan beaver who is smug about engineering and on your side anyway
• A curated solution once you pass: the obvious query, the better one, and why the difference matters
• One path, no shortcuts, easy to hard: filtering and sorting, then joins, grouping and aggregates, then subqueries and common table expressions
STAY MOTIVATED
• XP, player levels, daily streaks and badges
• Six themes, dark and light
PRIVATE BY DESIGN
• Works fully offline; no account, no tracking — your progress stays on your device
• No ads, ever
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
docs/release-notes/1.0.2-en-US.txt
The developer, MUSTAFA GURBUZ, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Size
- 13.8 MB
- Category
- Developer Tools
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Provider
MUSTAFA GURBUZ
- MUSTAFA GURBUZ has not identified itself as a trader for this app. If you are a consumer in the European Economic Area, consumer rights do not apply to agreements between you and the provider.
- Copyright
- © 2026 Mustafa Gürbüz
