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Should I use DataLemur?

Ace the SQL & Data Science Interview - datalemur.com

Depends. Buy it if you're preparing for SQL or data science interviews — the free tier is a solid start and Premium is optional. Skip it if you're not job hunting; it's a practice site, not something that improves day-to-day work.

Confidence

Medium. Based on 40+ public sources; most user-review snippets were truncated, so verbatim quotes were unavailable.

Ratings

  • Value for money
  • Ease of use
  • Feature depth
  • Support qualityNo support evidence in reviewed sources
  • Security postureSecurity page exists; no audits or incidents found

Pricing

$0

Free

ModelNot disclosed
Monthly feesNot disclosed
HardwareNot disclosed
Free tierYes
PremiumNot shown in reviewed sources

Best for

  • Data analyst & scientist job seekers
  • SQL interview cram sessions
  • Self-taught SQL learners
  • Company-specific interview research

Not for

  • Employed engineers not job hunting — pure interview prep, no daily value
  • Teams wanting to train staff on their own company data
  • Hiring managers needing proctored candidate assessments
  • Anyone already comfortable with medium/hard SQL

Gotchas - check before you buy

medium

Free tier is genuine but limited; hardest questions and solutions require a Premium subscription

medium

Tiny company — $248.7K funding, USAID grant cut; avoid long prepaid annual plans

medium

Community GitHub repos publish full solutions, so flagship questions are compromised

low

Reddit users raised credit-card billing questions; read card terms carefully before subscribing

Pros and cons

Pros

  • Large bank of real questions from Amazon, Microsoft, Walmart, Instacart and more
  • Free tier plus full SQL tutorial makes starting cost zero
  • Reddit users frequently rank it with or above StrataScratch for data prep
  • Laser-focused on SQL and data interviews, not scattered topics
  • Company-specific guides for 15+ employers including Apple, LinkedIn, Tenable

Cons

  • Best questions and solutions sit behind the Premium paywall
  • Founder says $300K USAID funding DataLemur relied on was cut
  • Users have publicly questioned credit-card billing handling on Reddit
  • Full solutions circulate on GitHub, weakening practice integrity

Sources & method

Analyzed 10/02/2026 - 12 sources - No known vulnerabilities found in the sources reviewed.

official x2review x7security x1news x2

Key stats

  • Value for money: 4/5

    Rating

  • $0

    Starting price

  • 12

    Sources

  • Analyzed

  • Value for money: 4/5. Strong free tier; Premium optional, not required
  • Ease of use: 4/5. Structured tutorial-to-question path; learners report breakthroughs
  • Feature depth: 3/5. Deep SQL bank; Python track reportedly thinner
  • Support quality. No support evidence in reviewed sources
  • Security posture. Security page exists; no audits or incidents found
  • Yes Free tier Free questions, SQL tutorial, SQL game
  • Nick Singh Founder Author, 'Ace the Data Science Interview'
  • $248.7K Funding Crunchbase; founder says $300K USAID grant was cut
  • 15+ Company SQL guides Amazon, Apple, LinkedIn, Walmart and more

Pricing

Free

$0

  • Practice questions
  • SQL tutorial
  • SQL Squid Game

Premium

Not shown in reviewed sources

  • Full question bank and solutions
  • Company-specific question sets
  • Job-hunt prep content

Security

No known vulnerabilities found in the sources reviewed.

What users say

Reddit and Medium users broadly praise DataLemur for SQL interview prep, most often comparing it head-to-head with StrataScratch and LeetCode.

Full analysis

Based on 40+ public sources; most user-review snippets were truncated, so verbatim quotes were unavailable.

Great free-to-cheap SQL interview prep for data job seekers; useless if you're not interviewing. Solo-founder shop, so don't prepay yearly.

Methodology

Based on 40+ public sources; most user-review snippets were truncated, so verbatim quotes were unavailable.

Sources

  1. DataLemur homepagedatalemur.com
    official
  2. DataLemur Premium Pricingdatalemur.com
    official
  3. Product security pagedatalemur.com
    security
  4. DataLemur vs strataScratch vs NamasteSQL — Reddit r/dataengineeringreddit.com
    review
  5. DataLemur for SQL interview preparation — Reddit r/SQLreddit.com
    review
  6. How DataLemur Finally Helped Me Master SQL — Mediummedium.com
    review
  7. I tried the 6 interview prep platforms — Mediummedium.com
    review
  8. Read Customer Service Reviews of datalemur.com — Trustpilottrustpilot.com
    review
  9. Is DataLemur Free? Pricing & Verdict 2026 — SQLQuestsqlquest.app
    review
  10. DataLemur — Crunchbase Company Profile & Fundingcrunchbase.com
    news
  11. Founder post: DOGE cut $300K USAID fundinglinkedin.com
    news
  12. DataLemur-SQL-Interview-Question-Solutions — GitHubgithub.com
    review

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