StrataScratch is a deep coding-question bank. DataPrepAI is a full prep system: it scores your answers across every round, analyses your resume against the job description, and tracks your readiness, rather than being a library of problems to solve.
A large bank of real-company SQL and Python data-science questions. Strong if you want to practice coding problems that mirror actual company interviews.
AI interview prep built only for data roles: scored full-loop mock interviews, resume-to-JD gap analysis, and per-skill readiness.
| Capability | StrataScratch | DataPrepAI |
|---|---|---|
| Built only for data roles | SQL / Python DS focus | Yes, six data roles |
| Scored full-loop mock interviews (SQL, Python, ML, case, behavioral, system design) | Not the core focus | Yes, every round, scored against a rubric |
| Resume-to-JD gap analysis + ATS score | Not offered | Yes |
| Per-skill readiness vs your target role | Not offered | Yes |
| Coding-question volume | A real strength | Curated, plus the full loop |
Competitor details last checked mid-2026; tools change, so verify specifics on their site. “Not the core focus” means it isn't what that tool is built around, not that it's impossible there.
Competitor names are trademarks of their respective owners, used only to identify the products compared. DataPrepAI is not affiliated with, sponsored by or endorsed by any of them.
Candidates who want volume, lots of real-company SQL/Python problems to work through.
You want to know your readiness for a specific data job, scored practice across every round, a resume-to-JD gap analysis, and a plan built for your target role.
DataPrepAI: Free to start (2 full mock interviews, no card). Pro is $29 for 30 days or $59 for 90 days. Every paid plan is a time-boxed pass, nothing auto-renews, 7-day money-back.
StrataScratch: StrataScratch has a free tier and a mid-priced subscription (around $29/mo when last checked). Verify current pricing on their site.
It depends on what you want. Candidates who want volume, lots of real-company SQL/Python problems to work through. If instead you want to know your readiness for a specific job (scored mock interviews across every round plus a resume-to-JD gap analysis) DataPrepAI is built for that, only for data roles.
StrataScratch is a deep coding-question bank. DataPrepAI is a full prep system: it scores your answers across every round, analyses your resume against the job description, and tracks your readiness, rather than being a library of problems to solve.
Yes, 2 full mock interviews and the free tier need no card. Pro is $29 for 30 days with a 7-day money-back guarantee.