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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 | SQL today, more skills rolling out - learn-by-doing + interview prep | 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 - resurfaces the weak spots you keep missing (rolling out through beta) | No - fixed catalog | No - fixed question bank |
| Runs fully in the browser | Yes - editor, database & grading, nothing to install | Yes | Yes |
| Price | Free during beta | 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 weak-spot practice that adapts (rolling out through beta). 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 is live today; adaptive drilling and describe-your-own-goal tracks are rolling out through the beta. See how it works or the SQL interview prep guide.
// Questions
Prepshotz vs LeetCode vs DataLemur - FAQ
Is 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.
Prepshotz 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 an engine that brings back the mistakes you keep making (rolling out through the beta).
Does Prepshotz have algorithm and data-structure problems like LeetCode?
Not today. Prepshotz is live for SQL now; Python, JavaScript, Java, C++, C#, data analysis, and algorithms are rolling out during the beta. If you need a large algorithms catalog right now, LeetCode is the better fit; if you want hands-on SQL with teaching and adaptivity, start with Prepshotz.
Is 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 Google to save your progress.
Do 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.