Basics · Web Development
Three terms that are often confused, defined with examples, compared side by side and mapped to what you actually need.
Last updated: October 2026. Written by Athar Ahmad, Certified Bubble.io Developer and Tech Architect, Simple Automation Solutions.
Quick answer
A website presents information, a web app is interactive software that runs in a browser where users log in and work with data, and a mobile app is installed from an app store and can use device features. Choose a website to inform and attract, a web app for portals, dashboards and SaaS, and a mobile app when you need device features or store presence. Many businesses use a website plus a web app.
Key takeaways
- Website = inform; web app = do work in the browser; mobile app = installed, with device features.
- A PWA sits between a web app and a native app.
- Web apps cost more than websites; native apps are usually a separate extra build.
- Launch web first if you are unsure about mobile.
- Write the scope before building any of them.
In this guide
“Do I need a website, a web app or a mobile app?” is one of the first questions a founder faces, and the answers are often muddled. The three overlap, and the terms are used loosely, but they are different things with different costs, timelines and purposes.
This guide explains the difference between a website, a web app and a mobile app, with examples, a comparison table and a simple way to decide which you need.
What is a website?
A website is a collection of pages that present information: who you are, what you offer, articles, contact details. Visitors mostly read and click. Content may be updated through a content management system such as WordPress, but visitors generally do not log in to do work. Examples: a law firm’s marketing site, a restaurant’s menu page, a blog.
What is a web app?
A web app is interactive software that runs in a browser. Users typically log in, enter or manage data and trigger actions, with the app storing information and applying logic. Examples: a client portal, an online booking system, a project management tool, a SaaS dashboard. There is nothing to install from an app store.
What is a mobile app?
A mobile app is software installed on a phone or tablet, usually downloaded from the Apple App Store or Google Play. It can use device features such as the camera, location and push notifications. Examples: a banking app, a fitness tracker, a ride-hailing app.
Website vs web app vs mobile app: comparison
| Website | Web app | Mobile app | |
|---|---|---|---|
| Main purpose | Inform and persuade | Do work: manage data and processes | Do work with device features and app store presence |
| User accounts | Rarely | Usually | Usually |
| Data and logic | Minimal | Substantial | Substantial |
| Runs in | Browser | Browser | Installed on device |
| Distribution | Search and links | Search, links and direct sign-up | App stores |
| Updates | Instant | Instant | May need store review |
| Device features | Limited | Limited | Full access |
| Typical build effort | Lower | Medium to high | Highest, and a separate build |
| Typical tools | WordPress, Webflow | Bubble.io, custom code | Native builders, custom code |
What about progressive web apps?
A progressive web app, or PWA, is a web app that can be added to a phone’s home screen and behave more like an installed app. It sits between a web app and a mobile app. It is a good option when you want an app-like feel without store distribution, though support for some device features varies by phone and system.
How do you decide which you need?
| If you need to… | You probably need |
|---|---|
| Explain your business, rank in search and generate enquiries | A website |
| Let users log in, manage records, upload documents or complete workflows | A web app |
| Use the camera, reliable push notifications or offline behaviour | A mobile app |
| Appear in app stores or sell through them | A mobile app |
| Do all of the above | A website for marketing, a web app for the product, and a mobile app later if usage justifies it |
Many businesses end up with a website and a web app together: a marketing site on a content platform and the product itself on an application platform. See our comparison of Bubble.io and custom code for how we think about the application side.
How do costs and timelines differ?
- A simple website is typically the quickest and cheapest.
- A web app costs more, because it needs data design, logic, security and testing. Builds at Simple Automation Solutions start at $3,500, with the final quote based on scope.
- A native mobile app is usually a separate build from the web app, and it adds store requirements and ongoing updates.
See what an MVP really costs and realistic build schedules.
What are the common mistakes?
- Asking for an app when a website would do.
- Building a mobile app first, when a responsive web app would validate the idea faster.
- Trying to run a content-heavy marketing site and an application on one tool.
- Underestimating security needs for apps that hold user data. See our security guide.
- Skipping planning. Whatever you build, write the scope first.
Frequently asked questions
What is the difference between a website and a web app?
A website mainly presents information, while a web app is interactive software where users log in, manage data and complete tasks.
Is a web app the same as a mobile app?
No. A web app runs in a browser and needs no installation. A mobile app is installed from an app store and can use device features.
Do I need a web app or a website for my business?
If you only need to inform and attract customers, a website. If customers or staff need to log in and work with data, a web app.
Can a web app work on a phone?
Yes. A responsive web app adapts to phone screens, and a PWA can be added to the home screen.
Which is cheaper to build: a web app or a mobile app?
A web app is usually cheaper, because a native mobile app is a separate build with store requirements.
Not sure which one you need?
Email us what you want users to do. We will recommend website, web app, mobile app or a combination, and explain why.
Athar Ahmad, Certified Bubble.io Developer and Tech Architect, Simple Automation Solutions
About Simple Automation Solutions (SA Solutions)
Simple Automation Solutions is a Bubble.io development studio led by Athar Ahmad, a Certified Bubble.io Developer and Tech Architect. It builds web and mobile apps, client portals and SaaS products for founder-led businesses such as law firms, accounting firms, boutique agencies and consultants. Services include a free 30-minute Idea Audit, a $345 Discovery Sprint (a Product Requirements Document delivered within 24 hours, credited toward the build) and builds starting at $3,500. Website: sasolutionspk.com.
