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Digital health app design for Europe and the US
Digital health app design for Europe and the US: one core product with local layers for language, units, dates, consent and trust cues.
Short answer
Digital health app design for Europe and the US works best as one product with local layers: one core flow and design system, with language, units, date formats, consent wording and trust signals that change by market. Plan those layers from the first design round, because adding them after launch means redesigning screens you’ve already built.
Sooner or later, every European HealthTech founder hears it from an investor: “And the US?” Every US founder hears the same about Europe. The temptation is to build for one market and translate for the other.
That works for a while. Then a German user reads a date as the wrong month, a US user sees their weight in kilograms, and the consent screen that passed review in one country confuses everyone in another.
One product we design, Elli Cares, an app for people living with cognitive impairment and their families, is used in 19 countries. Here’s what it has taught us about designing one product for both sides of the Atlantic.
One core product, different local layers. Framework by Dtail Studio.
What actually changes between Europe and the US?
Language, units, formats, consent and the cues people use to decide whether to trust you. The core task usually stays the same. The figure below sets the main differences side by side.
Language is the biggest one in Europe. The EU alone has 24 official languages, and you can’t assume everyone reads English: in 2022, 25.3% of working-age adults in the EU knew no foreign language at all.
And language affects whether people use you at all. A CSA Research survey of 8,709 consumers found that 76% prefer to buy products with information in their own language, and 40% will never buy from websites in other languages.
How do you design one product for both markets?
Design the core once, and make everything that varies a setting, not a screen. In practice:
Words.
Write plain source copy that translates well. Leave room for longer words: German labels can be much longer than English ones.Units and numbers.
Let people see weight, height and temperature in the units they think in, while you store one standard. The US NIST notes that US healthcare measurements are commonly recorded in metric, even though everyday life mixes systems.Dates and times.
Never write 03/04 in a health app. Spell out the month, and use 12- or 24-hour time by locale.Consent and privacy.
Europe’s GDPR and the US’s HIPAA ask different questions. Your legal advisers write the rules. Design makes them readable.Trust cues.
European users may look for data hosting and certifications. US users may look for insurer or clinical partner names. Design space for both.
Our point of view: the riskiest place isn’t translation, it’s onboarding. The first minute carries consent, permissions and the promise of the product, and it’s where local differences pile up. Our post on HealthTech onboarding and consent covers that minute in detail.
What about accessibility rules?
Design to one high standard for both markets. In Europe, the European Accessibility Act has applied since 28 June 2025 to a range of digital products and services. We’ve written about what the EAA means for your health app. Designing to that level from the start means you don’t run two accessibility roadmaps.
Which market should you design for first?
The one where your first paying customer is, with the second market’s layers planned but not built. Plan the structure for both: text that can grow, unit settings, flexible date formats, a consent flow that can vary by region. Build the content for one.
The Elli App is a good example of one core serving many markets. It’s used in 19 countries, built on simpler flows, a high-contrast UI and a calm visual language for people who find technology hard. The case study shows the system.
How we’d approach it
We’d map the differences before designing the screens. For a health app going to Europe and the US, that usually means:
List what varies by market.
Language, units, formats, consent, trust cues and support. Put each on one page.Design the core flow once.
With space for longer text, unit choice and local consent built in.Test with users from both markets.
The same flow, five people on each side, before building.Hand over a system, not two products.
Components and rules your engineers can localise without redesigning.
Bring your target markets, your current product and your launch order. More on how we work. If you’re comparing studios for this, our list of healthcare UX design agencies in Europe is a good place to start.
FAQ
Who can design a digital health app for Europe and the US?
A studio that has shipped products in several countries and can show you how it handled language and consent. Ask for an example in the first call.
Should we launch in English only?
Only if your users read English comfortably. For many patient groups in Europe, they don’t.
Can we use machine translation?
For drafts, yes. Health content should be reviewed by a native speaker, ideally one with clinical context.
Do we need two separate apps?
Almost never. One app with local settings is cheaper to build, test and maintain.
Try this today
Open your app’s three most important screens and change the language to German in a design tool or your browser’s translation. Look for broken buttons, cut-off labels and dates that could be misread. Every one you find now is a fix you won’t pay for twice.
If you’re planning a launch across both markets, let’s talk.
About the author: Alma Johnson is Content Lead at Dtail Studio and writes about brand strategy, positioning and how founders explain what they do.
Sources: European Union, Languages, Eurostat, Foreign language skills statistics, CSA Research, Survey of 8,709 consumers (2020), NIST, The reason the US doesn’t use the metric system (2024), AccessibleEU, The EAA comes into effect in June 2025
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