StrataScratch has the bigger raw question count and verified provenance. SQL Quest has the bigger free tier, the wrong-answer diagnostic, and the AI Coach. Side-by-side comparison without the hype — including the cases where StrataScratch is genuinely the better pick.
200+ FREE
No paywall pressure
AI Coach (Claude)
Plain-English Q&A
No signup needed
Browser-only, instant
Pick SQL Quest if…
You hit StrataScratch's paywall and don't want to pay $39/mo just to see more questions. You want a tutor that explains why your query is wrong. You're learning SQL, not just grinding interview questions. You want a roadmap that adapts as you improve. You don't need Python questions — you only care about SQL.
Pick StrataScratch if…
You're prepping for a data scientist role that tests both SQL and Python — StrataScratch covers both. You've already exhausted SQL Quest's 200+ challenges and want pure question volume. You value verified provenance ("this is the actual question Meta asked") more than diagnostic feedback.
Use both if…
SQL Quest as your daily driver (free tier covers most prep), StrataScratch Premium for the final stretch when you want maximum question volume on real interview questions. Most users don't need both — but if interview prep is your full-time focus for 6+ weeks, the combination beats either one alone.
12 features that matter when you're prepping. Verified May 2026.
Verified May 2026. StrataScratch features and pricing change — check their site for the latest.
Common gripes from candidates who hit the StrataScratch paywall or got tired of staring at "wrong" with no diagnosis.
StrataScratch's free tier is a teaser. SQL Quest's free tier is the product — 200+ challenges across all difficulties, the AI Coach (daily quota), the full skill radar, every sector track, all 12 company landings. Most candidates ship interviews on the free tier alone.
Your query produces wrong results. StrataScratch shows you the expected table — squint and find the diff yourself. SQL Quest tells you: "Row 3, column total_revenue, your value 4,820 — expected 4,920. You included refunded orders." Same wrong query, two completely different debugging experiences.
Stuck on a window function? Type the question in plain English. Claude reads your query, schema, and expected output and explains what's actually wrong. StrataScratch's discussion threads sometimes have the answer — sometimes you wait hours for one that does.
StrataScratch is a question library — you decide what to do next. SQL Quest's Coach picks the next step: lesson when you're missing a concept, drill when a skill is rusty, mastery check when you're ready to test up. Less decision fatigue, more forward motion.
SQL Quest's 10-axis radar shows which skills are weak in numbers (CTEs at 32, Window Functions at 41, JOINs at 78). The Coach then drills the weak axes specifically. StrataScratch tags topics on questions but doesn't aggregate them into a measurement you can act on.
SQL Quest
Free → $19/mo or $199 lifetime
Free includes:
200+ challenges (Easy / Medium / Hard)
AI Coach (Claude) — daily quota
Adaptive 10-axis skill radar
All sector tracks (finance, real estate, manufacturing)
All 12 company-specific landings
Wrong-answer diagnostic
StrataScratch
Free (limited) → ~$39/mo or ~$159/yr
Free includes:
~50 free questions
Browser SQL editor
Discussion threads
Premium adds:
Full SQL + Python question bank (500-700+)
Real company-curated questions
No AI tutor included
Pricing as of May 2026.
Not a hatchet job. Real cases where StrataScratch wins.
📚 Pick StrataScratch if:
You're prepping for a data-scientist role that tests both SQL and Python in the same interview. StrataScratch covers Python; SQL Quest is SQL-only by design.
You've already exhausted SQL Quest's 200+ challenges and want pure question volume. StrataScratch has materially more raw questions if you count both languages.
Verified provenance matters to you — "this is the actual question Meta asked in 2024" with high confidence on the source. StrataScratch curates with strong sourcing claims.
You learn well from peer discussion threads. StrataScratch's community is active; SQL Quest leans on AI explanation instead.
Your interview is in 1-2 weeks and you want maximum cram-bank density. SQL Quest's adaptive Coach is built for the 4-12 week ramp; StrataScratch's flat list is faster to grind through.
If two of those bullets describe you, StrataScratch is probably the right call. If three of them don't, SQL Quest is faster and cheaper.
Open SQL Quest, start solving, see the AI Coach and the wrong-answer diagnostic in action. Free forever on the core experience.
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