Neither of these platforms is a better version of the other, and this comparison will not pretend otherwise. GPAtlas is a structured GP learning environment: clinical library, audio, SCA preparation, everyday AI tools and CPD capture. iatroX is an adaptive knowledge system: question-driven clinical reference, assessment across your scope, Socratic remediation, spaced retesting and learning evidence. They address different stages of the same learning cycle, input and understanding on one side, verification and retention on the other, so the useful comparison is by job to be done.
The fundamental distinction
GPAtlas's core loop is explain and capture: read an Ocean summary or listen through Echo, practise an SCA case, ask Ask Expert a question, and let the CPD and Portfolio Hubs record the activity and help structure the reflection. iatroX's core loop is test and verify: an adaptive question set finds what you actually know, the Tutor interrogates each miss until the misconception is named and corrected against cited NICE, CKS, SIGN or SmPC guidance, spaced repetition retests the correction after a delay, and My CPD packages the sequence, score, error, correction, retention, reflection, as evidence. One platform optimises for how knowledge gets in; the other for proving it stayed.
Comparison by job to be done
Looking up a clinical question: both, differently; Ask Expert within GPAtlas's ecosystem, askiatroX with citations resolving directly to the national guidance, both MHRA Class I registered, and the test for each is the same: can you reach the primary source in one step? Reading a concise GP topic: GPAtlas, clearly; iatroX is not a library. Listening on a commute: GPAtlas's Echo, unopposed. Preparing for the SCA: GPAtlas's home ground, cases, marking sheet, consultation framework, ideally alongside human practice. Preparing for the AKT: iatroX, whose curated adaptive bank, mocks and planner are built for blueprinted written exams; our AKT guide is at /blog/best-ai-tutors-for-mrcgp-akt-and-sca. Finding hidden knowledge gaps: iatroX, by design; adaptive assessment exists to surface what you would not have chosen to revise. Correcting an error: iatroX's Tutor, whose Socratic dialogue diagnoses the misconception rather than restating the answer. Testing retention: iatroX, and this job has no GPAtlas equivalent. Recording CPD: both capture; the records differ in kind, activity and reflection on one side, assessed performance with delayed retesting on the other. Building an appraisal portfolio: GPAtlas's Portfolio Hub structures reflections helpfully; iatroX's records supply the assessed entries; neither replaces your appraisal system of record.
Three realistic scenarios
A GP registrar facing AKT and SCA in the same year uses both without conflict: iatroX as the AKT spine, adaptive sets, Tutor, mocks, GPAtlas as the SCA workshop, cases and marking sheet plus paired human practice, and either platform's capture for the portfolio. A newly qualified GP maintaining breadth leans on GPAtlas for readable, listenable currency and on iatroX for the quarterly assessed sweep that finds what the first year of independence has quietly eroded. An experienced GP optimising appraisal evidence runs the lightest version: askiatroX or Ask Expert for the week's questions, one iatroX session a fortnight to convert reading into assessed, retested records, and a portfolio that now contains evidence of learning rather than only evidence of activity.
Where each is strongest, and where combining wins
GPAtlas is strongest where structure, multimodality and accessibility matter: SCA preparation, audio-first learning, an ecosystem that lowers the barrier to engaging at all, a design goal its neuroinclusive positioning makes explicit. iatroX is strongest where measurement matters: adaptive gap-finding, misconception-level correction, delayed retention, and evidence that demonstrates more than a certificate of attendance alone. Combining them is not a compromise; it is the learning cycle assembled: input through GPAtlas, verification through iatroX, one reflection spanning both. The full workflow, including weekly routines for registrars, post-CCT GPs and locums, is at /blog/gpatlas-iatrox-mrcgp-cpd-workflow.
Pricing and value
GPAtlas offers plans from around £10 per month with a free tier carrying limited AI credits; iatroX's free tier includes askiatroX and selected full banks, with the complete platform at £29 monthly or £99 annually (both last checked August 2026; verify live pages before deciding). Running both costs less than most single update courses, which matters because the honest recommendation for many GPs is exactly that.
Final decision framework
Choose by your binding constraint. If your problem is input, time, attention, accessible formats, structured SCA practice, start with GPAtlas. If your problem is verification, unknown gaps, decayed knowledge, appraisal evidence that shows learning, start with iatroX. If your problem is both, which for most working GPs it is, the pair was never really a choice.
Frequently asked questions
Is one of these platforms more trustworthy clinically?
Both register their AI answer tools as MHRA Class I devices and both cite sources; trust should rest on your own spot-checks of citation quality and currency, run identically on each.
Can GPAtlas's capture replace My CPD, or vice versa?
They capture different objects: activity and structured reflection versus assessed performance with retesting. Either can populate your portfolio; they are substitutes only if you decide you need just one class of evidence.