The clinical AI market has fragmented into distinct categories serving different users, different workflows, and different geographies. Understanding which category each tool belongs to — and which categories are available to UK clinicians — is the prerequisite for making informed decisions about adoption.
Category 1: General-Purpose AI Applied to Medicine
These are the large language models that clinicians already use — not because they were designed for clinical workflows, but because they are powerful, accessible, and convenient.
ChatGPT (OpenAI). The most widely used AI tool among clinicians globally. Three health-specific products launched in 2026: ChatGPT Health (consumer, 7 January — connects medical records and wellness apps, excluded from UK/EEA/Switzerland), ChatGPT for Healthcare (enterprise, 8 January — HIPAA-compliant, GPT-5 models, deploying at 8 major US institutions), and ChatGPT for Clinicians (individual, 22 April — free for verified clinicians, launched today). Powered by GPT-5 models. Strong at evidence synthesis, writing, and administrative tasks. Not UK-regulated. Not optimised for UK guidelines. None of the three health-specific products are currently available to individual UK clinicians. The Nature Medicine study (February 2026) found 52% undertriage of emergencies in the consumer product.
Claude (Anthropic). Strong reasoning, safety focus, and document analysis capabilities. Good at reading and analysing clinical papers, discharge summaries, and complex clinical scenarios. No health-specific product or medical device registration. Constitutional AI approach with built-in safety constraints.
Gemini (Google). Google Health integration developing. Med-PaLM lineage with strong multimodal capabilities — particularly promising for imaging analysis (radiology, dermatology, pathology). Google's health data infrastructure (Fitbit, Google Health) positions them for future consumer health AI. No standalone clinician product yet.
Perplexity. Citation-first search AI with strong source attribution — every claim is linked to its source, making verification faster than with conversational AI models. Good for rapid evidence queries. Not health-specific. No regulatory status.
Category strengths: Versatile, powerful at general tasks, widely accessible, strong at writing and evidence synthesis, improving rapidly with each model generation. Category limitations: No regulatory status in any jurisdiction. Variable guideline alignment — predominantly US-trained, potentially citing US guidelines for UK clinical questions. Documented hallucination risk in clinical contexts. Not purpose-built for clinical workflows. No structured clinical tools (calculators, Q-banks, CPD).
Category 2: Clinician-Facing Clinical AI (Purpose-Built)
Tools designed specifically for clinical use — built from the ground up to serve clinicians rather than adapted from general-purpose models.
OpenEvidence. The largest clinician-facing platform globally. $12 billion valuation following a $250 million Series D (January 2026). Approximately 15 million clinical consultations per month from verified clinicians worldwide. Free — ad-funded with pharmaceutical advertising during loading screens, with CPMs reportedly in the $70-150+ range (among the highest ad rates in digital health). Embedded into Mount Sinai's Epic EHR in March 2026 — placing AI clinical decision support inside the physician's primary workflow. Uses proprietary models (not ChatGPT). HIPAA-compliant, SOC 2 Type II certified. Strongest for US evidence queries and peer-reviewed literature synthesis. US-centric in guideline coverage but globally accessible.
iatroX. UK-focused clinical AI platform. MHRA-registered, UKCA-marked Class I medical device. Free. Ask iatroX retrieves and synthesises NICE guidelines, CKS summaries, peer-reviewed literature, and SmPC data — grounded in the authoritative sources UK clinicians actually use. Also includes 15+ adaptive exam Q-banks covering all major UK exams (PLAB, UKMLA, MRCP, MRCGP AKT, MRCEM, PSA, MSRA — free; specialist diplomas at £99/year), 80+ clinical calculators with editorial content and guideline references, and CPD documentation tools. The only platform combining clinical AI + exam preparation + calculators + CPD in a single regulated device. Purpose-built for UK clinical practice from foundation year to consultant.
Medwise AI. UK enterprise clinical AI with NHS Trust deployments. Integrates local Trust policies, formularies, and antimicrobial guidelines alongside national NICE guidelines. Enterprise licensing — not available to individual clinicians. Strongest for institutional workflow integration where local protocols need to sit alongside national guidelines within a governed institutional framework.
Glass Health. Differential diagnosis generation from clinical presentations. US-focused. VC-backed. Narrower scope than full clinical AI platforms but focused execution — input a clinical presentation, receive a structured differential with reasoning. Strong educational tool.
DxGPT. Diagnostic AI from Foundation 29. Focused specifically on rare diseases — an area where general-purpose AI models lack sufficient training data and specialist clinical AI fills a genuine gap. Not-for-profit.
Category strengths: Purpose-built for clinical workflows. Authoritative source grounding (peer-reviewed literature, clinical guidelines). Some have regulatory status (iatroX — MHRA-registered; OpenEvidence — HIPAA/SOC 2). Designed for clinical contexts rather than adapted from general-purpose models. Category limitations: Narrower scope than general-purpose AI — may not cover every administrative or non-clinical use case. Smaller user bases than ChatGPT.
Category 3: AI Scribes and Documentation
A distinct category frequently confused with clinical AI but serving a fundamentally different purpose. Scribes capture and document consultations. They do not answer clinical questions. Using both categories together is complementary — the scribe documents the consultation; the clinical AI helps verify the management plan.
Heidi Health. Custom templates, letter writing, clinical note generation. Zero data retention privacy model. Positioning as "care partner" beyond pure scribing — adding evidence access, clinical workflow features, and broadening toward a care-assistance model. Popular in UK and Australian primary care.
Tortus AI. UK-focused AI scribe. NHS deployments across 3,500+ practices. Ambient listening with structured note generation writing back directly to EMIS and SystmOne — the two dominant UK GP clinical systems. Strong NHS primary care positioning.
Tandem Health. European AI scribe positioned as "AI-native operating system for clinics." Used by 5,000+ care organisations across 10+ European markets. 200,000+ NHS clinicians via Accurx Scribe partnership. CE-marked, MHRA-registered. MDR Class IIa Coding Assistant — the first in Europe in its category. Recently announced partnerships with Doctor Care Anywhere (60,000+ monthly consultations) and Humanitas in Italy. Founded 2023 in Stockholm, $50 million raised.
Nabla. Fast ambient scribe with zero data retention privacy model. Minimal friction design — optimised for speed.
Freed AI. The simplest scribe product. One job: listen to the consultation, generate the note. Minimal feature complexity for clinicians who want scribe functionality without broader platform overhead.
Nuance DAX / Dragon Copilot. Microsoft/Nuance enterprise clinical documentation. Dragon Copilot heritage. Enterprise deployment integrated within the Microsoft ecosystem — Teams, Azure, Copilot infrastructure.
Abridge. US-focused ambient documentation. Integrated with major US health systems including UPMC, UCI Health, and others. Strong US institutional deployment trajectory.
Important distinction: Scribes and clinical AI are complementary, not competing. A clinician might use Tortus or Tandem to document a consultation and Ask iatroX to check whether their management plan aligns with the latest NICE guideline. Different tools for different moments in the same clinical workflow.
Category 4: Enterprise Clinical AI
These tools require institutional procurement, IT infrastructure, and enterprise agreements. They are not available to individual clinicians.
ChatGPT for Healthcare (OpenAI). Hospital-wide deployment. HIPAA-compliant with BAAs and customer-managed encryption. GPT-5 models. Already at 8 major US institutions. Citations from peer-reviewed studies. Enterprise pricing.
Microsoft Copilot for Healthcare. Enterprise only. Six-figure annual commitments. Requires Microsoft ecosystem. Combines Dragon Copilot clinical documentation heritage with broader workflow automation — scheduling, prior authorisation, clinical messaging.
Doximity DoxGPT. Available to US physicians through the Doximity professional network (2 million+ US physicians). PeerCheck citation verification system checks AI-generated references against real publications. Integrated with Doximity's existing physician communication and career platform.
Category strengths: Institutional governance frameworks. HIPAA/BAA compliance. Role-based access controls and audit trails. Institutional policy integration. Category limitations: Not available to individual clinicians. Enterprise pricing. Requires IT infrastructure and institutional procurement.
What a UK Clinician Can Actually Use Today
Available to individual UK clinicians: iatroX (free, MHRA-registered — clinical AI + exams + calculators + CPD), Heidi Health (AI scribe), Tortus AI (AI scribe, NHS-integrated), Tandem via Accurx (AI scribe, NHS-integrated), standard ChatGPT/Claude/Gemini (general-purpose, with the safety caveats detailed in the companion guide), and OpenEvidence (free, globally accessible, US-evidence-centric).
Not available to individual UK clinicians: ChatGPT Health (geo-blocked), ChatGPT for Healthcare (enterprise, no UK deployments), ChatGPT for Clinicians (appears US-first), Microsoft Copilot for Healthcare (enterprise), Doximity DoxGPT (US physicians only).
Available at institutional level only: Medwise AI (enterprise, NHS Trusts).
Where the Market Is Heading
Convergence. OpenAI's three-tier stack (consumer → individual clinician → enterprise) will be replicated. Expect Claude for Healthcare, Gemini for Healthcare, and similar products from Anthropic and Google within 12-18 months. The pattern is clear and every major AI company is positioning for healthcare.
Regulation is coming. The MHRA's National Commission into the Regulation of AI in Healthcare is developing recommendations. The UK will likely formalise requirements for clinical AI tools to hold medical device registration. Platforms already registered — iatroX has MHRA registration, Tandem has CE marking and MHRA compliance — have a regulatory head start that takes years and substantial investment to replicate. New entrants, including OpenAI, will face this barrier.
Guideline localisation will be the differentiator. As foundation model capabilities converge, the technical gap between tools narrows. The differentiator shifts from "does it know medicine?" to "does it know MY medicine?" — UK guidelines versus US versus Australian versus Canadian. Global models will need local guideline layers to be clinically useful in specific jurisdictions. iatroX has this for the UK already; no general-purpose AI does.
Workflow integration is the endgame. The winning tools will be embedded in clinical workflows — inside the EHR, triggered by clinical events, surfacing the right information at the right moment. Mount Sinai embedding OpenEvidence in Epic is an early signal. Tandem embedding into Doctor Care Anywhere's virtual care platform is another. iatroX's integration across exam preparation, clinical calculators, clinical AI, and CPD creates a different kind of workflow integration — spanning the learning-to-practice continuum rather than the single consultation.
iatroX's Unique Position
The only platform combining clinical AI (Ask iatroX — NICE/CKS/literature/SmPC-grounded), exam preparation (15+ adaptive Q-banks with spaced repetition and mock exam mode), clinical calculators (80+ dedicated tools with editorial content and guideline references), and CPD documentation — all within an MHRA-registered medical device. Available in the UK. Free. Purpose-built for UK clinical practice. This combination is unique. No other tool in any category — general-purpose, clinician-facing, scribe, or enterprise — covers this breadth within a single regulated platform.
Try iatroX — clinical AI, exam prep, calculators, and CPD in one MHRA-registered platform →