What is the difference between the three?
- A website presents information to visitors: who you are, what you offer, how to contact you. Most pages look the same to everyone.
- A web app runs in the browser and lets people log in and do things: book, pay, manage records, see dashboards.
- A mobile app is installed on a phone from an app store and can use device features such as notifications, camera and offline storage.
How do they compare?
| Website | Web app | Mobile app | |
|---|---|---|---|
| Main job | Inform and build trust | Let users complete tasks | Daily or on-the-go use |
| Needs a login | Rarely | Usually | Usually |
| Speed to launch | Fastest | Moderate | Slowest |
| Cost to build | Lower | Moderate | Higher, especially for iOS and Android |
| Updates | Instant | Instant | App store review for each release |
| Found through search | Yes | Partly | Mostly through the store |
Which one suits which business?
- A college or clinic: a clear website for trust and enquiries, then a portal (web app) for students, parents or patients.
- A D2C brand: an online store first. A mobile app only once repeat customers justify it.
- A startup with a new product: usually a web app that works well on phones, to test the idea.
- A service business: a website with a booking form, then an internal tool as operations grow.
What about progressive web apps?
A progressive web app is a web app that can be added to a phone's home screen and works smoothly on slow connections. For many products it delivers most of the benefit of a mobile app at a fraction of the effort. It is a good middle step.
Why is starting with a mobile app often a mistake?
It is the most expensive way to find out whether people want your product. You need separate builds for iPhone and Android, you wait for store approvals, and you ask users to download something before they know it is worth it. Prove the idea in the browser first.
How do you decide?
- Do people need to find and trust you before anything else? Start with a website.
- Do users need to log in, submit data or see their own information? Build a web app.
- Do you need push notifications, offline use or the camera as a core feature? A mobile app earns its place.
- Not sure? Build the smallest web version and watch how people use it.
A practical example: how a clinic might sequence it
A clinic group needs patients to find it, trust it and book. The first build is a clear website with services, doctors, locations and an enquiry form. Next comes a web portal where patients can see appointments and reminders. A mobile app only makes sense later, if patients use the portal often enough to want it on their phones.
Each step is justified by what happened in the one before it. That is a hypothetical path, but the principle, earn each next step, applies to most businesses.
What should you ask before commissioning a mobile app?
- Why can this not work well as a web app?
- Do we need iPhone, Android or both, and can we start with one?
- What happens when the phone's operating system updates?
- Who maintains the app, and what does that cost each year?
- How will people find and install it?
How does search visibility differ?
Websites are the strongest tool for being found, since search engines can read every page. Web apps behind a login are largely invisible to search. Mobile apps are discovered mostly through store search and word of mouth. If being found matters, the website is not optional.
When do you need all three?
A mature business often does: a website to attract, a web app for customers and staff, and a mobile app for daily use. The sensible order is the order in which each one proves its worth.
Related: Websites and digital commerce · Mobile applications · All articles