Updated April 29th, 2026

Maybe you feel the same as me. I spent and spend a lot of time in reading rooms, reading radiology studies myself and discussing them with my colleagues. And my phone is almost always closer than my workstation when I need to look something up. May it be a Bosniak category, a lung disease differential, the ideal follow-up interval for a 6 mm subsolid nodule or just that uncommon combination of TSH, fT3 and fT4… Over the years I’ve tried a lot of radiology apps and online radiology resources. Most are mediocre but a few have genuinely changed how I work or how fast I´ll find my desired answer.

This article is a curated list of the radiology apps I have installed or that I recommend to residents when they ask. The focus is strictly on radiology: References, learning, and guidelines. I have deliberately left out general medical apps (UpToDate, MDCalc, Medscape), PACS viewers, and community platforms, which dont belong on my personal radiology-specific list. Free and freemium apps are preferred where possible.

Full disclosure: One of the apps on this list is my own project. I’ve flagged that clearly.

Another disclaimer: Regarding cost, I just differentiated between “Free” (if completely free) and “Freemium” if there are optional things to buy.

1. Radiology Assistant 2.0

📱 App Store · iOS only · Freemium

Features of Radiology Assistant 2.0

• Peer-reviewed articles from the Radiological Society of the Netherlands
• Covers most subspecialties (abdomen, chest, MSK, neuro, head n neck, paediatric, cardiac, breast…)
• Works offline once you’ve downloaded the content
• Won the Minnie for “Best Radiology Mobile App” a few times

What I like about it: In my opinion, this is the closest thing radiology has to a universal textbook on your phone. The editorial standard is genuinely high with lovely illustrations and each article reads more like a structured teaching session than a bullet-point summary. Everything works offline once downloaded. Android users are out of luck, the old Android version was discontinued. So in 2026 this is iOS-only.

2. UBC Radiology

📱 App Store · 🤖 Google Play · Free

Features of UBC Radiology

• Built by faculty, residents and medical students at the University of British Columbia
• Anatomy quizzes across X-ray, CT, MRI and ultrasound
• Worked-up clinical cases with pathology correlation where relevant
• Structured approaches for CXR, AXR, head CT
• Completely free on both platforms

What I like about it: Some free radiology apps on the stores are either barely functional hobby projects or ad-heavy content farms. I discovered it far too late into my carrier but UBC Radiology is neither. It is a proper educational resource from a real academic radiology department, and it’s currently genuinely free on both platforms. It’s aimed at medical students and early-year residents, so it won’t teach you advanced MSK imaging, but as a first radiology app for a junior trainee, nothing else really comes close.

3. Radiopaedia*

*I know, not an App but you need to know it (if you not already do)

🌐 radiopaedia.org · Web · Freemium

Features of Radiopaedia

• The world’s largest collaborative radiology encyclopaedia
• Thousands of cases across every modality and subspecialty
• Articles on classifications, signs, anatomy, approach. Basically everything. And if somethings missing, write the article!
• Case packs with scrollable multi-image stacks
• Quiz mode and exam practice (I used it to learn for my boards!)
• Mobile-optimized website (put it on your home screen)

What I like about it: I’m including Radiopaedia here just because I´m a huge fan. Radiopaedia once had dedicated mobile apps, but currently, the strategy is clearly web-first, and honestly the mobile website is good enough that you won’t miss having an app. If you Google a radiology term, chances are high you end up on Radiopaedia within a few clicks. Andrew Dixon, Frank Gaillard and thousands of contributors have built something that has no real peer. The only reason it’s at #3 on this list rather than #1 is that it technically isn’t an app.

4. Gantry

📱 App Store · 🤖 Google Play · Free

Full disclosure: Gantry is my own project. I built it because I couldn’t find what I needed.

Features of Gantry

• Contrast media screening based on ESUR and ACR guidelines (CA-AKI, NSF, metformin, thyroid, allergy, pregnancy, paediatrics)
• 50+ scoring and classification flows: LI-RADS, PI-RADS, TI-RADS, Lung-RADS, BI-RADS, O-RADS, C-RADS, CAD-RADS, PSMA-RADS, Bosniak, BCLC, Fleischner, ASPECTS, RECIST, Child-Pugh, Schatzker, Pfirrmann, and more. (If somethings missing, let me know!)
• Calculators: eGFR, MESA CAC scoring, Nadler, GBCA dosing, adrenal washout, Brock malignancy score for incidental lung nodules
• Emergency protocols per current ERC and ESUR guidance
• Offline. No AI. Guideline-based. No login, no tracking, no ads.

Why I felt the need for another app: I built Gantry after collecting more than two years of questions from my residents and after countless night shifts with high case volumes. Gantry is what I wish I’d had: A fast-responding, strictly guideline-referenced tool that works offline, doesn’t involve an LLM hallucinating a number at me, and gets out of the way after giving me the answer. Every output traces back to a published guideline. If you find a mistake, its my personal one…

5. BerlinCaseViewer

📱 App Store · iOS + macOS · Freemium

Features of BerlinCaseViewer

• PACS-like viewer for iPhone, iPad and Mac
• Free “Case of the Month” plus paid modules for specific topics
• Strong MSK and rheumatology focus (arthritis, wrist anatomy, osteoarthritis)
• Pulmonary modules covering common DD situations
• Multiple-choice questions with colored overlays that point to the relevant finding
• Case summaries at the end of each case

What I like about it: If you´re focussing on MSK and MRI, you need it! BerlinCaseViewer is unusual because it actually feels like a real image viewer. You scroll through stacks the way you would on a workstation, rather than flicking through flat JPGs. The core app is free and the paid modules are curated by named specialists (not crowd-sourced), which shows in quality. The MSK and rheumatology modules in particular are genuinely excellent and hard to find elsewhere. iOS and Mac only since the Android version was retired.

6. IMAIOS e-Anatomy

📱 App Store · 🤖 Google Play · 🌐 imaios.com · Freemium

Features of IMAIOS e-Anatomy

• A huge labelled cross-sectional atlas across CT, MRI, radiography, angiography, nuclear
• Labels in a dozen languages
• Scrollable stacks in axial, coronal, sagittal
• Free preview of a subset of images before you subscribe
• Many universities and hospitals already have institutional access

What I like about it: When I need to check a specific anatomic structure on cross-section (damn these lower-leg muscles…) e-Anatomy is the best reference I know of on a phone. The depth is remarkable. It isn’t cheap for full private access, but many institutions provide it through library subscriptions, so it’s worth checking with your hospital or university before you pay for it yourself.

7. Chest Xray Academy

🤖 Google Play · Android + iOS · Freemium

Features of Chest Xray Academy

• A few hundred annotated chest X-ray cases
• PA, AP and lateral views
• CT correlations for the important patterns
• Structured reporting templates
• Quizzes for exam-style practice

What I like about it: This is a focused, niche app that does one thing and does it reasonably well. Until AI takes over, chest X-ray interpretation happens to be one of the skills residents ask me about most. There are enough annotated cases to actually build interpretation speed rather than just memorize patterns. Not glamorous but very helpful and the free tier covers enough to be of great use before you decide whether to unlock more.

8. Radiology Calculators (Rad At Hand)

🤖 Google Play · 📱 App Store · Freemium

Features of Radiology Calculators

• 30+ classifications and scoring systems, offline
• Covers the usual suspects: RADS, ASPECTS, Trauma scoring and much more
• Volume calculators for liver, spleen, prostate, thyroid, gonadal
• Adrenal washout (CT) and chemical shift (MRI)
• Favorites, search, dark/light themes

What I like about it: A well-crafted calculator app by a named radiologist, and it shows. I discovered it after I’d already started building Gantry, and while there’s some overlap in the classifications, the two have different priorities: Rad At Hand focuses on clean calculators, Gantry adds contrast media screening and emergency protocols around them. Good to have both in the ecosystem.

9. Differential Diagnosis Guide (Thoracic Radiology)

📱 App Store · iOS only · Free

Features of Differential Diagnosis Guide

• Around 80 thoracic DD lists
• Covers lung, pleura, heart, mediastinum, lymphatics, large airways
• Browse alphabetically or by organ system
• Basic search
• Completely free, no account needed

What I like about it: It feels like this app hasn’t really been updated in years and is just simple. But for me that’s also the charm. When you’re staring at a weird mediastinal mass at 2 a.m. and need a quick prompt to remember the differentials, it gives you exactly that and nothing else. A small reminder that a useful radiology app doesn’t need to be slick to earn a permanent spot on a home screen.

10. MRI Made Easy… well almost

📱 App Store · iOS only · Free

Features of MRI Made Easy

• Interactive introduction to MR physics, fully animated
• Quiz questions to test your MRI physics knowledge
• Cross-chapter full-text search from the index
• Winner of the 2024 Minnies Best Radiology Mobile App Award
• Completely free, no ads

What I like about it: MR physics is one of those topics that most residents eventually pick up from a mix of textbooks, lectures and just doing the job (until their boards, afterwards lot of it is forgotten within weeks.. ;). This app is a rare attempt to teach it properly on a phone, with animations that actually help you see what’s happening. It’s completely free, won the 2024 Minnies Best Radiology Mobile App Award at RSNA, and is well worth an hour of your time if you want a gentler entry into MR physics than the usual textbook.

Closing thoughts

If you’re just starting out, I’d install UBC Radiology and bookmark Radiopaedia. Both free, both excellent, and between them they’ll cover the vast majority of your reference needs. If you’re on call and want fast guideline lookup, that’s what I built Gantry for. And if you want structured peer-reviewed reading material to work through over months, Radiology Assistant 2.0 is still hard to beat for the price.

Happy reading!