Helping healthcare professionals diagnose better, faster

Dem Dx works in over 160 countries to help healthcare staff and students to improve their clinical diagnostic-reasoning skills.

A Better Way to Support
Medical Diagnosis

Dem Dx guides users as they diagnose patients, moving from presenting complaint, through associated symptoms and signs to final diagnosis. At each stage, Dem Dx suggests the most relevant question to ask or sign to elicit.

10,000+ Clinical Presentations

1,300+ Clinical Conditions

14 Specialties

500+ Media files


Dem Dx has been developed with the support of our global community of medical specialists. All our content is updated on a regular basis to ensure access to the latest in medical thinking.


Guy's and St Thomas’ NHS Trust
Guy’s and St Thomas’ NHS Trust runs Guy’s Hospital, St Thomas' Hospital and the Evelina Children’s Hospital. The Trust is also part of King’s Health Partners, an academic health sciences centre, pioneering health research and providing high quality teaching and education

Johnson & Johnson Corporate Citizenship Trust
The Global Community Impact team at Johnson & Johnson invests in people on the front lines of care as they change the trajectory of health for the world's most vulnerable people, their families and their communities.

Co-funded by the Horizon 2020 programme of the European Union

Dem Dx has received funding from the European Union’s Horizon 2020 research and innovation programme

Moorfields Eye Hospital NHS Trust
Moorfields was founded in 1805 as the world’s first hospital devoted to the treatment of eye disease. It remains the UK’s leading ophthalmology institution with 32 locations in and around London and the South East of the UK and the Middle East.

Innovate UK
Innovate UK is part of UK Research and Innovation and works to support businesses to develop and realise the potential of new ideas from the UK’s world-class research base

Access Afya
Access Afya runs a chain of micro-clinics in Nairobi's informal settlements bringing healthcare to the people that need it the most.

Kitrinos Healthcare
Kitrinos Healthcare provides first aid and primary healthcare for refugees through a team of international volunteers working together across camps and mobile clinics in north-eastern Greece.

NHS Choices is the UK’s biggest health website offering thousands of articles, videos and tools to help communities and citizens understand more about their health

Medical Aid Films
Medical Aid Films uses innovative media to transform the health and wellbeing of women and children around the world in their vision of a world where every woman and child is healthy in pregnancy and throughout life.




“Dem Dx has won me over as a fantastic teaching resource for case based teaching with undergraduate medical students.”

Consultant in Children’s Emergency Medicine
Evelina London Children’s Hospital, London

“Dem Dx is an essential pocket tool for every junior serves as a quick reference guide to enhance confidence in clinical decision making and diagnosis.”

Academic Clinical Fellow in General Practice
Guys and St Thomas' NHS Foundation Trust, London

“Dem Dx is a unique app that effectively aids my clinical learning by giving me logical pathways to help efficiently narrow down diagnoses.”

5th Year Medical Student
Imperial College Medical School, London

“Dem Dx is fantastic, allowing me to put together differential diagnoses from the reach of my pocket. Great for ward rounds, clinic settings and independent study too!”

5th Year Medical Student
Imperial College Medical School, London

“Dem Dx has helped me confirm my hypotheses and made me think about differentials. I definitely recommend Dem Dx for medical students and young doctors to build confidence on their clinical reasoning.”

Medical intern
Belo Horizonte, Brazil

Access Dem Dx Today

Sign up to Dem Dx today to receive a 1 week free trial, with full access across mobile, tablet and desktop