Both are free. Both have thousands of questions. Both target UK medical students. The difference is not price — it is architecture. Confidence is a traditional, community-driven Q-bank with peer comparison analytics. iatroX is an AI-adaptive platform with spaced repetition, clinical AI, and career-long utility. This comparison explains what each does well, where each falls short, and why the smartest students use both at different stages of their training.
Confidence: The Established Free Undergraduate Q-Bank
Confidence (by Meducation) is the largest free UK medical student Q-bank, trusted by over 100,000 students. It has been a staple of undergraduate medical revision for years — and for good reason.
The platform provides 3,500+ questions across all undergraduate medical topics, covering the full breadth of the curriculum from preclinical sciences through clinical specialties. The mock exam generator simulates real exam conditions with a running clock, producing the time-pressure environment that final exams create. Format flexibility allows you to practise SBAs, True/False questions, and extended matching questions — covering every question format you might encounter in university assessments and the UKMLA.
Peer comparison analytics show how your performance ranks against other Confidence users. This competitive benchmarking serves two purposes: it identifies whether you are performing above or below the cohort average across different topics, and it provides the motivational pressure that many students find helpful ("I'm in the 40th percentile for cardiology — I need to improve"). The peer comparison is a social learning feature that no other free Q-bank replicates at this scale.
Expert-written explanations accompany each question, with mnemonics and linked video resources to aid retention. The platform is fully free — no premium tier, no paywall, no credit card required. No account is needed to try the questions. This zero-friction access model has driven adoption across UK medical schools.
What Confidence does well: Breadth, accessibility, and community. 3,500+ questions spanning every undergraduate topic provides comprehensive coverage for preclinical and early clinical years. The peer comparison analytics create accountability and identify relative weaknesses. The format variety (SBA, T/F, EMQ) is broader than most free platforms. And the fact that 100,000+ students have used it means the peer benchmarks are statistically meaningful — you are comparing yourself against a large, representative cohort.
What Confidence does not do: Adaptive difficulty adjustment. The questions are static — if you get 9 out of 10 cardiology questions right and 3 out of 10 endocrinology questions right, Confidence serves you the same mix tomorrow. There is no mechanism to concentrate your practice on your weakest topics automatically. No spaced repetition algorithm ensures previously-weak topics resurface at optimal intervals for long-term retention. No topic-level mastery tracking (as opposed to peer comparison — knowing you are in the 60th percentile for respiratory does not tell you whether you have actually mastered respiratory at exam standard). No clinical AI reference. No postgraduate exam coverage. After finals, Confidence serves no further purpose in your training.
iatroX: The Free Adaptive Q-Bank That Grows With Your Career
iatroX provides a free UKMLA Q-bank with AI-adaptive difficulty adjustment and built-in spaced repetition — the two evidence-based learning mechanisms that Confidence lacks.
The adaptive engine analyses your performance across every MLA Content Map topic after every question and automatically serves the next question to target your weakest area. You do not need to interpret analytics and manually select weak topics — the system does it continuously, on every question. If your renal medicine is strong and your psychiatry is weak, the engine serves more psychiatry questions until your proficiency improves — then moves to the next weakest area.
The spaced repetition algorithm ensures that topics you previously got wrong resurface at scientifically optimised intervals — not too soon (wasting time on content still fresh in memory) and not too late (allowing the memory to decay below retrievable threshold). This is the mechanism that converts short-term exam cramming into long-term clinical knowledge — knowledge that persists into your foundation years and beyond, not just until exam day.
The performance dashboard shows topic-level mastery across all MLA Content Map domains. Unlike Confidence's peer comparison ("you are in the 60th percentile for respiratory"), iatroX shows proficiency against the exam standard ("your respiratory proficiency is 72% — here are the specific subtopics pulling your score down"). One tells you where you rank. The other tells you what to fix.
Beyond the Q-bank: Ask iatroX provides instant clinical AI reference grounded in NICE/CKS/BNF — useful for understanding why an answer is correct, not just what the answer is. The UKMLA Academy provides 402 structured condition pages covering all 18 body systems — functioning as study notes alongside the Q-bank. iatroX Calculators provides 80+ UK-contextualised clinical tools. Mobile app on iOS and Android.
And after finals, the same platform covers PSA, MRCP, MRCGP AKT, MSRA, and 7 postgraduate diploma exams (DRCOG, DFSRH, DGM, DipIMC, FFICM, DTM&H, DCH) — no platform switch required. Your performance history, your weak-area tracking, and your clinical reference habits carry forward into your career without interruption.
The Learning Science Gap
This is the substantive difference between the two platforms — not a feature list, but a cognitive architecture difference that affects learning outcomes.
Confidence uses a traditional Q-bank model: do questions in a topic, read explanations, compare your score with peers, repeat. This is effective for content exposure — seeing a wide range of topics builds familiarity and identifies areas where your knowledge is weak relative to peers. For preclinical and early clinical years, when the goal is broad coverage and topic discovery, this model works well.
iatroX adds two evidence-based mechanisms that transform the learning process. Adaptive difficulty means you are always working at the edge of your knowledge — the zone of proximal development where learning is fastest. Questions that are too easy (because you have already mastered the topic) waste time. Questions that are too hard (because you have not yet studied the topic) produce frustration without learning. Adaptive difficulty keeps every question in the productive zone.
Spaced repetition ensures that previously-weak topics resurface at the intervals that maximise long-term retention. Ebbinghaus's forgetting curve is one of the oldest and most replicated findings in experimental psychology: without spaced review, approximately 70% of new learning is forgotten within 48 hours. Spaced retrieval practice — the mechanism iatroX uses — produces 2 to 3 times better long-term retention than massed study (Cepeda et al., 2006; Roediger and Karpicke, 2006).
Confidence provides retrieval practice (doing questions is retrieval practice). iatroX provides optimised retrieval practice — retrieval practice enhanced by adaptive difficulty targeting and spaced repetition scheduling. The difference is meaningful for an exam like the UKMLA that tests breadth and depth simultaneously across hundreds of clinical topics.
Who Should Use Which
Preclinical and early clinical years (years 1-3) — broad topic revision and peer benchmarking → Confidence's 3,500 questions and format variety provide excellent breadth. The peer comparison motivates engagement. The format variety (SBA, T/F, EMQ) exposes you to different question styles before you encounter them in assessments. Use Confidence as your primary Q-bank during preclinical years.
Finals preparation (year 4-5, UKMLA-aligned) — precision targeting of weak areas → iatroX adaptive engine mapped to the 2026 MLA Content Map. By finals, you need precision — not broad exposure. You need to know exactly which of the 212 clinical presentations you are weakest on and concentrate practice there. The adaptive engine and topic-level proficiency dashboard provide this precision. Use iatroX as your primary Q-bank for UKMLA preparation.
Throughout — clinical reference → Ask iatroX. When a Q-bank explanation on either platform raises a "what exactly does NICE say?" question, Ask iatroX provides the cited answer in seconds. This is useful alongside both Confidence and iatroX questions.
Both are free, so the real answer: Use Confidence for breadth in early years. Transition to iatroX for finals and postgraduate. The two platforms complement each other across your training trajectory — and the total cost is zero.
After Finals: Where Confidence Stops and iatroX Continues
Confidence has no postgraduate content. After passing finals, it serves no further purpose. Your Confidence account, your performance history, your peer rankings — all become irrelevant the day after your results.
iatroX covers the entire training pathway: UKMLA → PSA → MRCP/MRCGP AKT → MSRA → Diplomas → Clinical reference → CPD → Revalidation. Starting on iatroX during medical school means your performance data, your proficiency tracking, and your clinical reference habits carry forward into your career without interruption. The weak areas you identified during UKMLA preparation are the same weak areas your spaced repetition algorithm will continue to target during foundation training and beyond.
This is not a marginal convenience — it is a structural advantage. Every platform switch involves a cold start: new account, blank performance history, no personalised targeting. iatroX eliminates platform switching for the entirety of your UK medical career.
Practical Comparison: What a Study Session Looks Like
On Confidence: You select "Cardiology" and "SBA format." The platform serves 20 questions in random order from the cardiology bank. You score 14/20. The results page shows your percentage and your peer ranking (65th percentile). You review the 6 questions you got wrong, read the explanations, and close the tab. Tomorrow, if you select cardiology again, you may see some of the same questions — including ones you already answered correctly.
On iatroX: You start an adaptive session. The engine serves your first question from the MLA content area where your proficiency is lowest — perhaps endocrinology. You get it right, and the engine moves to your next weakest area — perhaps neurology. You get that wrong, and the explanation references NICE NG127 with a citation link. You tap Ask iatroX to ask a follow-up question about the guideline edge case. The next session, the neurology topic you got wrong resurfaces (spaced repetition), alongside new questions from other weak areas. Your proficiency dashboard updates in real time.
The difference is subtle in a single session. Over 8 weeks of daily practice, the cumulative effect is substantial: the adaptive candidate has concentrated hundreds of additional questions on their weakest topics, while the static candidate has distributed effort evenly — including significant time on topics already mastered.
The Combined Free Stack for Medical Students
Both platforms are free. Both can be used simultaneously with zero cost. The optimal combined approach:
Years 1-3: Confidence for broad topic exposure and peer benchmarking. iatroX Ask for clinical reference during placements. iatroX Calculators for clinical scores on the ward.
Year 4-5 (finals): iatroX adaptive Q-bank for UKMLA preparation. Confidence for occasional format variety (T/F, EMQ). iatroX UKMLA Academy for structured condition revision.
FY1 onwards: iatroX only — adaptive Q-bank for PSA/MRCP/MRCGP, Ask iatroX for daily clinical reference, Calculators for ward scores.
Verdict
Confidence is an excellent free Q-bank for undergraduate medical students — the breadth, peer comparison, and format variety are genuinely valuable during preclinical and early clinical years. iatroX is an excellent free adaptive Q-bank for UKMLA preparation and beyond — the adaptive engine, spaced repetition, and clinical AI reference provide the precision targeting that finals preparation demands.
Use Confidence in years 1-3. Transition to iatroX for finals. Keep iatroX for your entire career. Total cost: zero.