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// Compare
Prepshotz vs LeetCode & DataLemur
All three let you write real SQL and grade it by running it. The difference is the loop around it:LeetCode is an algorithm-first catalog with a SQL section, DataLemur is a curated bank of SQL and data-science interview questions, and Prepshotz wraps each problem in teaching - a concept primer, a hint ladder, and feedback tied to your actual output - and adapts to the mistakes you keep making. It is free during beta.
// Side by side
How they compare
| Feature | Prepshotz | LeetCode | DataLemur |
|---|---|---|---|
| Main focus | Learn-by-doing + interview prep across SQL, Python, JavaScript & TypeScript | Algorithms & data structures, with a Database (SQL) section | SQL & data-science interview questions |
| How you practice | Write real SQL in a browser editor; graded by running it against a real database | Write SQL/code; run against test cases | Write SQL; run against the question’s dataset |
| Teaching built in | Concept primers, a 3-step hint ladder, and failure feedback tied to your actual output | Community solutions, discussion & editorials | Free SQL tutorial + solutions |
| Adapts to your mistakes | Yes - a review queue resurfaces the weak spots you keep missing | No - fixed catalog | No - fixed question bank |
| Catalog size | Smaller, and growing - four languages today, no Java, C++ or C# | Very large | Focused SQL & data-science bank |
| Runs fully in the browser | Yes - editor, database & grading, nothing to install | Yes | Yes |
| Price | Free during beta; 5 goal-built tracks per account | Free tier; paid Premium | Free questions; paid tier |
| Best for | Learning SQL by doing, with feedback that adapts to you | Broad software-engineering (algorithm) interview prep | Company-style SQL / data-science interview drilling |
Competitor details reflect each tool’s general positioning; check their sites for current features and pricing.
// An honest take
When to use each
Reach for LeetCode
When your goal is broad software-engineering interview prep. Its strength is a large, well-known algorithms-and-data-structures library and an active community - SQL is one section within that bigger picture.
Reach for DataLemur
When you want to drill SQL and data-science interview questions modeled on real company questions, backed by a free SQL tutorial. A focused question bank for data-analyst and data-scientist prep.
Reach for Prepshotz
When you want to learn SQL by doing - not just test yourself. Every problem comes with a concept primer, a hint ladder that nudges before it solves, and failure feedback tied to your actual query output, plus a review queue that brings your weak spots back. Free during beta.
// The difference
Teaching and adaptivity, not just a catalog
A fixed catalog tells you whether you got it right. Prepshotz is built to get you to right: it explains the concept, nudges you with a hint ladder before it ever shows the answer, and when you miss it puts your output next to the expected one with a plain-English reason. The engine then brings your weak spots back at the right time so they stick.
The practice-and-grade loop, weak-spot review and describe-your-own-goal tracks are all live today; goal-built tracks are capped at 5 per account during the beta. See how it works or the SQL interview prep guide.
// Questions
Prepshotz vs LeetCode vs DataLemur - FAQ
01Is Prepshotz a good LeetCode alternative for practicing SQL?
Yes, if SQL is your focus. LeetCode is algorithm-first with a separate SQL section and a large fixed catalog; Prepshotz is SQL-first and grades every query by running it against a real database, with concept primers, a hint ladder, and feedback tied to your actual output. Use LeetCode for broad coding-interview breadth; use Prepshotz to learn SQL by doing with teaching built in.
02Prepshotz vs DataLemur - what is the difference?
Both focus on SQL and run your queries for real. DataLemur is a curated bank of SQL and data-science interview questions modeled on real company questions, with a free SQL tutorial. Prepshotz adds a teaching loop around each problem - a concept primer, a hint ladder that nudges before it solves, and failure feedback grounded in your run output - plus a review queue that brings back the mistakes you keep making.
03Does Prepshotz have algorithm and data-structure problems like LeetCode?
Yes. Algorithms and data structures are live in Python, JavaScript and TypeScript, graded by running your solution against a test suite. LeetCode’s catalog is far larger and has a much bigger solution community, so pick it for breadth; pick Prepshotz if you want fewer problems with teaching, hints and weak-spot review built around them. Prepshotz has no Java, C++ or C# yet.
04Is Prepshotz free?
Yes - it is completely free while in beta. There is no pricing page yet and no credit card required. You sign in with your email address and a one-time code. The one beta limit is 5 goal-built tracks per account, and a track cannot be deleted afterwards.
05Do you write real SQL, or is it multiple choice?
Real SQL. You write queries in a proper in-browser editor, hit Run, and your query executes against a real database - the result is compared to the expected answer. No multiple choice and no opinion: it either runs and matches or it does not.