With Step 1 now pass/fail, USMLE Step 2 CK has become the primary numeric measure that residency programs weigh — so the right question bank matters more than ever. This guide compares the leading Step 2 CK qbanks in 2026: their strengths, weaknesses, and who each suits. Pricing and question counts are approximate and current as of mid-2026; confirm on each provider's site before buying.
Some context: Step 2 CK is still scored on a three-digit scale, and its passing standard rose from 214 to 218 on July 1, 2025. The mean score for first-time US and Canadian MD examinees is around 249, and a competitive score for most specialties sits roughly between 240 and 260 — so for Step 2 CK, unlike Step 1, you are studying to score well, not just to pass. When comparing Step 2 CK banks, the priorities shift toward clinical-reasoning quality, shelf-exam coverage, and self-assessments that predict your three-digit score, since that score now drives residency selection.
UWorld — the clinical standard
UWorld remains the most-used and most-trusted Step 2 CK bank, with roughly 4,250 clinically focused questions (including shelf-exam coverage), detailed explanations and the most predictive self-assessments. Many students work through it during clerkships in tutor mode, then reset for dedicated study. The main drawback is cost, with subscriptions running from a few hundred dollars to around $730 for the longest plans. Best for: the core bank for both shelf exams and dedicated Step 2 CK study. A rough rule of thumb many students cite is to aim for a UWorld percentage in the high 60s or better as dedicated study progresses, though it is no guarantee of any particular score.
AMBOSS — NBME-style with a built-in library
AMBOSS offers roughly 3,400 to 3,500 Step 2 CK questions, an integrated medical library you can open from any explanation, and a score predictor. Its questions are frequently described as close to NBME style, and it markets that its users scored over 10 points higher on Step 2 CK than other qbank users — a vendor figure worth treating with healthy skepticism, but reflecting genuine strengths in clinical reasoning and lookup. A one-year plan typically costs less than UWorld, with a 5-day free trial. Best for: clerkships and weak-area work, and students who like an integrated reference. It is especially handy on clerkships for quick lookups between patients, doubling as a clinical reference.
Kaplan and TrueLearn — structured and analytics-rich
Kaplan provides a large, well-organized Step 2 CK bank with strong customer support and NBME-similar questions, pairing well with its courses. TrueLearn (SmartBanks) emphasizes real-time national benchmarking and analytics. Both are credible alternatives for learners who value structure or detailed performance data. Best for: course-aligned study (Kaplan) or analytics-driven learners (TrueLearn). TrueLearn is also widely used for shelf and specialty-board practice, which is convenient if you want one platform across clerkships.
Lecturio and BoardVitals — budget and guarantees
Lecturio bundles questions with video teaching and offers a large free tier, at a lower annual price than the leaders. BoardVitals offers a sizeable bank with a pass guarantee on longer plans. Both are reasonable options for budget-conscious or video-led learners. Best for: affordable, video-supported practice (Lecturio) or a guarantee-backed supplement (BoardVitals). Both also offer free trials worth using before committing.
Free and adjunct resources
The NBME Clinical Science self-assessments and Free 120 are official and the most predictive benchmarks, and should anchor your prep whatever bank you use. Free or low-cost shelf resources, spaced-repetition Anki decks and Divine Intervention's podcasts are popular adjuncts during clerkships. As with Step 1, these complement a comprehensive qbank rather than replace it.
iatroX — AI-tutored, adaptive and affordable
iatroX is a newer, mobile-first platform built around an in-question Socratic AI tutor, blueprint-mapped questions, spaced repetition and an adaptive engine. Its Step 2 CK pool is smaller and less established than the long-standing incumbents, so it is best used as an affordable, AI-guided supplement — for clinical-reasoning practice that coaches you through each case, and for review on the go. A subscription is $29/month or $99/year via the app, with free sample questions to test the fit. Best for: budget-conscious or international candidates wanting AI-tutored, adaptive clinical practice alongside a primary bank. Because the explanations are interactive, it suits learners who retain more by being questioned through a case than by reading a static answer.
How to choose
For most candidates, UWorld is the core Step 2 CK bank, begun during clerkships and reset for dedicated study, with AMBOSS a common second resource for NBME-style practice and weak areas. Because Step 2 CK now carries real weight in residency selection, prioritize the bank whose questions and explanations best build your clinical reasoning, and benchmark relentlessly with self-assessments. Take a baseline self-assessment early to gauge readiness, then repeat it at intervals; the trend matters more than any single score, and the official NBME forms are the most reliable predictor.
Common questions
Which Step 2 CK qbank is best? For most students, UWorld as the primary bank, with AMBOSS a popular complement; Kaplan, TrueLearn, Lecturio and BoardVitals suit specific needs and budgets.
What is a good Step 2 CK score? A competitive score for most specialties is roughly 240 to 260; the mean for first-time US and Canadian MD examinees is around 249, and the passing standard is 218 as of July 2025.
When should I start UWorld for Step 2 CK? Many students begin during clerkships in tutor mode to reinforce clinical learning, then reset the bank for dedicated study before the exam. With Step 1 now pass/fail, many start Step 2 CK practice earlier than they once did.
Why does Step 2 CK matter more now? Step 2 CK matters more now because Step 1 is pass/fail, making it the main numeric score residency programs use to compare applicants.
Is iatroX good for Step 2 CK? It is a newer, affordable, AI-tutored and adaptive option best used to supplement a primary bank; free sample questions let you try it first.