Complete practice for the Lean Six Sigma Green Belt certification exam. Over 2,000 original questions across all five DMAIC phases — Define, Measure, Analyze, Improve, Control — plus Lean fundamentals and statistics, with full-length timed mock exams, flashcards, and a readiness score that tells you when you're ready.
Original items across all five DMAIC phases, Lean fundamentals, and statistics — each with a rationale that shows the reasoning or the full calculation.
Up to 110 questions, weighted the way Green Belt exams weight each phase, with realistic timing options.
DPMO, sigma level, Cp/Cpk, hypothesis tests, correlation, regression, and control-chart limits — every calculation shown step by step.
Cards you miss come back sooner. Cards you nail come back later. Review is always current.
Per-phase mastery, accuracy trend, streak, exam countdown, and drills built from the phases you score worst in.
Everything is stored on your device. No account, no analytics SDK, no advertising SDK, no data leaves your phone.
Weights are approximate, modeled on commonly cited Green Belt bodies of knowledge, and vary by certifying body.
Six Sigma Green Belt Prep is a paid app with no free tier. A subscription or the lifetime unlock is required to use it. All prices are in US dollars and may vary by storefront.
Every question, explanation, and Exam Info summary is original and written by our team, informed by publicly published information about exam structure from ASQ and IASSC. The entire question bank is original study material — no real certification-exam questions are reproduced. This app is an educational study aid. It is not professional, consulting, or certification advice, and it does not substitute for the official training of ASQ, IASSC, or any other certifying body.