Web App vs Website: What Is the Difference and Which Do You Need?
Web app vs website explained in plain English: how they differ in purpose, users, cost and maintenance, with examples.
The web app vs website distinction matters because it changes almost everything about a project: who uses it, how it is built, what it costs and how it is maintained. A website mainly presents information for people to read. A web app lets people log in and get something done, such as placing an order, updating a record or managing an account. Many businesses need a website. Fewer need a web app, and choosing the wrong one wastes money either way.
This guide gives definitions that actually help, everyday UK examples, the differences in users, data, cost and maintenance, a five-question test and the hybrids that sit in between.
Key takeaways
- A website informs; a web app lets users log in, work with data and complete tasks.
- Logins, user-specific data and workflows are the clearest signs you need a web app.
- Web apps cost more to build and maintain because they handle data, permissions and business rules.
- Many businesses need a hybrid: a website with app-like features such as bookings or a client area.
- Answer the five questions in this guide before you brief anyone.
Definitions that actually help
A website is a set of pages that present information: who you are, what you offer, how to contact you. Most visitors never log in. The content is largely the same for everyone.
A web app is software that runs in a web browser. Users usually log in, see information that belongs to them and carry out tasks. The app stores data, applies rules and controls who can see and change what. The MDN web docs describe the technologies both are built on, but the difference that matters is purpose: reading versus doing.
Examples people use every day
| Example | Website or web app? | Why |
|---|---|---|
| A plumber's brochure site | Website | Presents services and contact details |
| BBC News | Website | Mainly content to read |
| Online banking | Web app | Logins, personal data and transactions |
| Gmail | Web app | Personal data and tasks in the browser |
| A trade ordering portal | Web app | Account pricing, orders and invoices |
| An online shop | Website with app features | Browse like a website, buy through app-like checkout |
Users, logins and data
The biggest practical difference is the user's relationship with the system.
- Website visitors are mostly anonymous. They read, compare and contact you.
- Web app users are known. They log in, have permissions and see their own data, such as orders, documents or bookings.
That brings responsibilities. A web app must protect personal data, check permissions on every action, keep audit trails and stay available, because people depend on it to do their work. For our own sourcing and export business, the CRM we built is a web app: each team member logs in, every item has a full history and the system enforces the stages a deal moves through. No website could do that job.
Cost and maintenance differences
Websites are mostly design and content, with updates and security maintenance afterwards. Web apps add bespoke logic, databases, user management, integrations and testing, and they keep evolving as the business changes.
As a rough guide, a professional small business website typically costs a few thousand pounds, while a focused web app often starts in the low tens of thousands. Running costs follow the same pattern. Our guide to custom software total cost of ownership explains how to compare the full cost over several years.
Five questions to tell which you need
- Will users need to log in? If yes, you probably need app features.
- Will each user see different information? Such as their own orders, documents or bookings.
- Will users create or change data? Beyond filling in a contact form.
- Does the system need to enforce business rules? Such as pricing tiers, approvals or stages.
- Will staff use it to do their daily work? If so, it is a tool, not a brochure.
If you answered no to all five, you need a website. If you answered yes to two or more, you probably need web app features, either as a separate app or added to your site.
Hybrids
Many businesses sit in between:
- A website with online booking, where the booking tool behaves like a small app.
- A website with a client area, where clients log in to see documents or project status.
- An online shop, which is a website for browsing and an app for checkout and accounts.
- A website plus a separate portal, for trade customers or staff.
WordPress handles many hybrids well through plugins and custom plugins, which our guide to custom WordPress plugin development explains. When the app side grows complex, a dedicated application is usually better. If the app side is a CRM, read our comparison of custom CRM vs off-the-shelf, and for the full picture, our guide to custom web application development. You can see our work on our custom web apps, custom CRM systems and custom portals pages.
Frequently asked questions
What is the difference between a web app and a website?
A website mainly presents information for people to read, and most visitors never log in. A web app lets users log in, see their own data and complete tasks such as placing orders or updating records. Web apps store data, apply business rules and control permissions, so they cost more to build and maintain.
Is Gmail a web app?
Yes. Gmail runs in a web browser, requires you to log in, shows your own messages and lets you send, sort and manage email. Those are the defining traits of a web app: user accounts, personal data and tasks carried out in the browser, rather than pages of content presented to everyone.
Do I need a web app for my business?
You need a web app if users must log in, see their own information, create or change data, follow business rules or use the system for daily work. If your goal is to present services and generate enquiries, a website is enough. Answering the five web app vs website questions in this guide will usually make the choice clear.
Not sure which you need?
Describe what people need to do and ask us whether you need a website, a web app or both.