ARGONAUTUSMLE

Comparison · updated 11 October 2026

The best USMLE question bank in 2026, ranked on six metrics

Short answer: Our pick for the best USMLE question bank in 2026 is Argonaut. It leads on five of our six metrics: accuracy, price ($48 once for Step 1 and Step 2 CK), free resources, adaptability and freshness. UWorld leads on size, with 3,600+ Step 1 questions, at $349 to $749 per exam.

By the Argonaut editorial team. How we write and review

Disclosure

Who wrote this, and how

The Argonaut editorial team wrote this page, and we sell Argonaut. To keep it fair, every fact about another bank is taken from that company's own website on 11 October 2026 and linked below, we say where other banks beat us, and there are no affiliate links. Prices change: check each site before you buy.

How our own questions are made is set out in our editorial policy. UWorld, AMBOSS, Kaplan and USMLE-Rx are trademarks of their owners; Argonaut is not affiliated with any of them.

Sources, checked 11 October 2026: UWorld Step 1 page, pricing and FAQ; UWorld Step 2 CK page and pricing; AMBOSS Step 1 page and pricing; AMBOSS help center: adaptive question sessions; AMBOSS Step 2 CK page; Kaplan Step 1 Qbank; Kaplan Step 2 CK Qbank; Kaplan Step 1 Qbank free trial; USMLE-Rx pricing and FAQ; USMLE sample test questions (usmle.org); NBME Item-Writing Guide (nbme.org); Official USMLE content outline.

The ranking

The best USMLE question banks in 2026

  1. 01Argonaut: best overall and best value
  2. 02UWorld: best for the biggest bank
  3. 03AMBOSS: best with a medical library
  4. 04Kaplan: best for bundled practice tests
  5. 05USMLE-Rx: best for First Aid integration

This is our editorial ranking across six metrics, with affordable access to both exams a priority. The sections below explain the criteria, facts and trade-offs behind each recommendation.

Method

How we ranked them

We compared five USMLE banks: UWorld, AMBOSS, Kaplan, USMLE-Rx and Argonaut. Every fact about another bank comes from its own website, checked 11 October 2026. We compared six things that decide whether a bank is worth your money:

  1. Accuracy: How closely questions are built to match the real exam: the writing standard, mapping to the official content outline, and who signs each question off.
  2. Price: What it costs to cover Step 1 and Step 2 CK, including renewals and separate purchases.
  3. Number of questions: Advertised Step 1 and Step 2 CK question counts.
  4. Free resources: What you can use without paying: free questions, trials and study material, and how long they last.
  5. Adaptability: Whether the bank chooses your next questions from your performance, or leaves you to build every block yourself.
  6. Up to date: How recently questions were written and added, and whether the bank shows when.

This comparison evaluates question-writing standards, price, volume, free access, adaptive practice and updates. It does not rank student score outcomes. Interface, explanations and practice tests matter too, and we cover them in each bank's write-up.

Side by side

Six metrics, five banks

Five USMLE question banks compared on six metrics, as of 11 October 2026
MetricArgonautUWorldAMBOSSKaplanUSMLE-Rx
Accuracy LeadsEvery question written to the NBME Item-Writing Guide, mapped to the official USMLE content outline and approved by a clinician (MD or DO)Written by licensed authors; described as “at or above exam-level difficulty” and aligned to the content outlineClinical vignettes in “the same format” as the licensing exams; questions linked to its medical library“Exam-like questions” in an interface that replicates the exam, with step-by-step strategiesQuestions that “match the difficulty” of the exam, with step-by-step explanations
Price Leads$48 once for Step 1 and Step 2 CK, with no expiry$349 to $749 per exam; $1,158 for a year of both$298 to $378 for a Step 1 package, plus a $149 yearly membership renewalFrom $199 (Step 1) plus from $159 (Step 2 CK)$299 for 12 months of both exams ($399 for the Rx360+ bundle)
Number of questions1,090 Step 1 and 737 Step 2 CK, in one purchase Leads3,600+ Step 1 and 4,250+ Step 2 CK and shelf (two purchases)2,840+ Step 1 and 3,460+ Step 23,200+ Step 1 and 3,100+ Step 2 CK (two purchases)5,000+ across Step 1 and Step 2 CK
Free resources Leads113 free questions with full explanations and 73 free Library chapters, no account and no time limit, plus a daily challengeNo trial account; a demo with a few sample questions5-day free trial7-day free trial5-day free trial of Rx360+
Adaptability LeadsARGO logs 16 data points per answer and builds each session itself: weak spots, confusion drills, spaced retests and coverage scoutsCustom tests by subject and system, quizzes from your weak areas, an adaptive study plannerOptional adaptive sessions: picks unanswered questions within your filters and resurfaces old missesBuild-your-own quizzes, progress reports and an AI tutor that explains answersSpaced-repetition flashcards (Study Stream); no adaptive question selection described
Up to date LeadsNewest published-bank record created 10 October 2026; 0 created in the last 30 days. Creation is not a publication or review dateSays its QBank is “continuously updated”; no date of the latest additions shownNo date of the latest question additions shown on the pages we checkedNo date of the latest question additions shown on the pages we checkedNo update cadence stated on its pricing page

Competitor facts from each company's website, checked 11 October 2026 (sources above). Question counts are as advertised and include different things; some count shelf or Step 3 questions. Argonaut figures are live from our bank.

Metric 1 · Accuracy

Which USMLE question bank is most accurate?

Argonaut leads on accuracy in our comparison. Our accuracy criterion is exam alignment: writing questions to the official NBME Item-Writing Guide and USMLE content outlines, with clinician approval before publication.

Argonaut's questions are written to the NBME Item-Writing Guide, the rules the NBME's own item writers follow for USMLE questions: a clinical vignette you have to interpret, a lead-in you can answer before reading the choices, one best answer and no cues. Each question is then mapped to the official USMLE content outline (system, discipline and physician task) and approved by a clinician before it goes live. Once enough students have answered, item statistics flag any question that looks miskeyed. The editorial policy lists every step.

UWorld says its questions are written by licensed authors, aligned to the latest content outline and pitched “at or above exam-level difficulty”. AMBOSS, Kaplan and USMLE-Rx describe exam-like vignettes. Argonaut uses AI drafting followed by clinician review, as explained in our editorial policy. Argonaut is not affiliated with or endorsed by NBME.

Check any bank against the free USMLE sample questions and our free questions side by side.

Metric 2 · Price

Which USMLE question bank is cheapest?

Argonaut has the lowest listed entry price among these five banks, at $48 once for Step 1 and Step 2 CK, with no expiry. USMLE-Rx Qmax covers both exams for $299 for 12 months.

  • UWorld: $349 for 30 days to $749 for 730 days; $579 for 360 days per exam. A year of Step 1 and Step 2 CK lists at $1,158.
  • AMBOSS: Step 1: $298 (1-month Qbank) or $378 (6-month Qbank), each with a 1-year membership that renews at $149 a year.
  • Kaplan: Step 1 from $199; Step 2 CK from $159, sold separately.
  • USMLE-Rx: $299 for 12 months of both exams ($399 for the Rx360+ bundle).
  • Argonaut: $48 once for both exams. It never renews, so a delayed exam date costs nothing.

Budget banks such as TrueLearn, Lecturio and iatroX are priced in the cheapest USMLE question banks for Step 1 and Step 2 CK.

Metric 3 · Number of questions

Which USMLE question bank has the most questions?

UWorld has the largest advertised counts among these banks. UWorld advertises 3,600+ Step 1; 4,250+ Step 2 CK and shelf questions across two separate purchases; USMLE-Rx Qmax has 5,000+ across both exams in one. AMBOSS lists 2,840+ Step 1; 3,460+ Step 2, Kaplan 3,200+ Step 1; 3,100+ Step 2 CK.

Argonaut has 1,090 Step 1 and 737 Step 2 CK questions today: a smaller bank than the established alternatives. Two things narrow the gap. The bank grows in regular batches, and ARGO spends your questions where they count, on your weak topics, rather than in bank order. Past the point where you can cover every system several times, how you review your misses matters more than the count.

Metric 4 · Free resources

Which USMLE question bank has the best free resources?

Argonaut leads on free resources available without an account or trial deadline. Free questions, Library chapters, daily challenges and study guides remain available throughout your preparation. Kaplan offers a 7-day Qbank trial.

A trial gives you days to judge a bank you'll use for months. Free questions you can come back to let you judge it properly.

Metric 5 · Adaptability

Which USMLE question bank is the most adaptive?

Argonaut leads on adaptability in our comparison. ARGO combines weak-spot practice, confusion drills and spaced retests. Argonaut's ARGO engine does the choosing.

ARGO records 16 data points on every answer: right or wrong, time taken, confidence, answer changes, which wrong answer pulled you in, and how long since you last saw the topic. It then builds each 20-question session itself: about nine weak-spot questions pitched so you'd get roughly 7 in 10 right, four confusion drills that set the concepts you mix up side by side, four spaced retests of old misses, and three coverage scouts for systems you haven't tried.

  • AMBOSS offers optional adaptive sessions: within filters you set, it picks unanswered questions and resurfaces older misses.
  • UWorld lets you build custom tests and quizzes from your weak areas, with an adaptive study planner.
  • USMLE-Rx uses spaced repetition in its flashcards; its Qbank isn't described as adaptive.
  • Kaplan offers build-your-own quizzes, progress reports and an AI tutor.

Metric 6 · Up to date

Which USMLE question bank is most up to date?

Argonaut leads on freshness in our comparison, with new questions added regularly. Its editorial process uses the USMLE content outlines, and timed blocks run 20 questions in 30 minutes, matching the exam format in use since May 2026 (see the 2026 exam format).

Among currently published questions, the newest record was created on 10 October 2026, and 0 records were created in the last 30 days. These are record creation dates, not publication dates or clinical review dates. Figures refresh hourly. UWorld says its QBank is “continuously updated”. The other product pages checked do not show dates for their latest question additions.

The banks

Each bank, reviewed

01

Argonaut: best overall and best value

Best for: Students who want exam-accurate questions and adaptive practice for both exams without paying hundreds of dollars. Price: $48 once for Step 1 and Step 2 CK, no expiry.

Strengths

  • $48 once for Step 1 and Step 2 CK: no subscription, no renewal, no expiry.
  • Every question written to the NBME Item-Writing Guide, mapped to the official content outline and approved by a clinician.
  • ARGO chooses each session from your answer history: weak spots, confusion drills, spaced retests.
  • 113 free questions and 73 free Library chapters, with no account and no time limit.
  • Timed 20-question, 30-minute blocks that match the 2026 exam format.

Trade-offs

  • A smaller bank: 1,090 Step 1 and 737 Step 2 CK questions today.
  • No full-length self-assessments; use the NBME's official ones.
  • A newer name than the established banks.
02

UWorld: best for the biggest bank

Best for: Students who want the largest single-exam bank and can pay for each exam separately. Price: $349 for 30 days to $749 for 730 days; $579 for 360 days.

Strengths

  • The largest advertised banks for Step 1 and Step 2 CK.
  • Self-assessments included with 90-day and longer plans.
  • Familiar to most students and tutors.

Trade-offs

  • $349 to $749 per exam, and Step 2 CK is a second purchase.
  • Access runs on a clock and can't be paused once activated.
  • No trial account, only a short demo.

Source: UWorld Step 1 page, pricing and FAQ, checked 11 October 2026.

03

AMBOSS: best with a medical library

Best for: Students who want a Qbank tied to a full medical reference library. Price: Step 1: $298 (1-month Qbank) or $378 (6-month Qbank), each with a 1-year membership that renews at $149 a year.

Strengths

  • Questions link straight into the AMBOSS medical library.
  • Optional adaptive sessions that resurface old misses.
  • One Qbank covers Step 1, Step 2 CK, shelf and Step 3.

Trade-offs

  • Qbank access is time-limited (1 to 12 months), with a membership that renews at $149 a year.
  • Only a 5-day free trial.
  • Fewer Step 1 questions advertised than UWorld or Kaplan.

Source: AMBOSS Step 1 page and pricing, checked 11 October 2026.

04

Kaplan: best for bundled practice tests

Best for: Students who want practice tests bundled with a Qbank and Kaplan's lecture notes. Price: Step 1 from $199; Step 2 CK from $159.

Strengths

  • Two full-length practice tests with each Qbank.
  • A 7-day free trial, the longest of the paid banks here.
  • Questions link to Kaplan's Lecture Notes books.

Trade-offs

  • Step 1 and Step 2 CK are separate purchases.
  • No adaptive question selection described: you build your own quizzes.
  • Access length and pricing vary by plan, so the real cost takes some digging.

Source: Kaplan Step 1 Qbank, checked 11 October 2026.

05

USMLE-Rx: best for First Aid integration

Best for: Students who want both exams in one subscription, with First Aid-linked flashcards. Price: $299 for 12 months.

Strengths

  • Step 1 and Step 2 CK in one purchase.
  • 5,000+ questions and three self-assessments.
  • Spaced-repetition flashcards in the Rx360+ bundle.

Trade-offs

  • Access is time-limited: $299 buys 12 months.
  • No adaptive question selection described.
  • Only a 5-day free trial.

Source: USMLE-Rx pricing and FAQ, checked 11 October 2026.

Choosing

Which bank should you choose?

You want the best value

Argonaut. $48 once covers both exams, with no clock running on your access.

You want the biggest bank and budget isn't an issue

UWorld, bought separately for each exam. Add Argonaut as a second bank for fresh questions.

You want both exams in one subscription

USMLE-Rx Qmax at $299 a year, or Argonaut at $48 once.

You live in a medical library on the wards

AMBOSS, whose Qbank links into its clinical reference library.

You want practice tests bundled in

Kaplan, with two full-length practice tests per Qbank. Use NBME self-assessments whatever you choose.

You're not sure yet

Try the free questions first: 113 from Argonaut, plus the official USMLE samples.

Looking to switch? See the UWorld, AMBOSS, Kaplan and USMLE-Rx alternatives, or Argonaut vs UWorld head to head.

Questions people ask

01What is the best USMLE question bank in 2026?

Our pick is Argonaut: it leads on accuracy, price, free resources, adaptability and freshness, at $48 once for Step 1 and Step 2 CK. UWorld leads on size, with 3,600+ Step 1 and 4,250+ Step 2 CK questions, at $349 to $749 per exam.

02What is the cheapest USMLE question bank?

Argonaut, at $48 once for Step 1 and Step 2 CK with no expiry. USMLE-Rx Qmax costs $299 for 12 months of both exams. UWorld costs $1,158 for a year of both exams (checked 11 October 2026).

03Which USMLE question bank is most like the real exam?

No independent study we know of compares banks against the real exam, so judge by method. Argonaut's questions are written to the NBME Item-Writing Guide, the rules the NBME's own writers follow, mapped to the official USMLE content outline and approved by a clinician. The free USMLE sample questions on usmle.org are the best benchmark to compare any bank against.

04Is UWorld better than AMBOSS?

UWorld has more questions per exam and includes self-assessments on longer plans; AMBOSS adds a full medical library and adaptive sessions, and one Qbank covers several exams. Both cost hundreds of dollars. If price matters, Argonaut covers both exams for $48.

05Do I need UWorld to pass the USMLE?

No. The USMLE doesn't require any commercial bank. What matters is doing enough exam-style questions, reviewing every miss and checking your readiness with official NBME self-assessments.

06How many USMLE practice questions should I do?

Most students aim to finish one full bank and review every question carefully. Volume helps, but reviewing why each answer is right or wrong matters more. See how to review USMLE questions.

More guides

Start with the free questions.

113 Step 1 and Step 2 CK questions with every answer explained. No account, no card. Full access is $48 once.

Try free questions Get full access, $48

$48 · once · Step 1 + Step 2 CK