TL;DR: A web app, short for web application, is interactive software that runs in your browser. Unlike a mostly informational website, a web app lets you log in, create content, and work with your own data, like sending email in Gmail, posting on Facebook, or booking a stay on Airbnb. Behind the scenes, they run on databases and backend logic, and they’re often faster to build and update than native mobile apps.
You probably opened a web app before you finished your coffee this morning. Gmail and your banking dashboard look like websites, but you’re not just reading them. You’re logging in, sending messages, and moving money around. That difference starts to matter once you’re thinking about building something yourself.
Below, you’ll learn how web apps work, the main types and their tradeoffs, and how they compare to websites and mobile apps. Then you’ll walk through the steps to build one without writing code.
What is a web app?
A web app is “an interactive piece of software that runs in your browser,” as Bubble engineer Sam Morgan puts it. It stores and processes data for every user, so what you see depends on who you are and what you’re doing.
Unlike a native mobile app, which you download from the App Store or Google Play Store and install on your phone, a web app lives at a URL. There’s nothing to install, so anyone with an internet connection can open one. Once you’re in, you can usually:
- Add your own data, like a profile you fill out or a photo you upload, and it will be there when you come back.
- Run workflows that trigger actions automatically. When you click “send” in Gmail, the message goes out and a copy lands in your Sent folder.
- Work with other people. In Google Docs, for instance, several people can edit the same file at once and comment on each other’s changes.
How do web apps work?
Every web app has two halves. The frontend is what you see and click, and the backend is where the logic runs and the data lives.
When you save a draft or update your profile, the frontend sends that request to the backend. The backend handles it and sends the result back to your screen.
Websites can have backends too, especially if they sell products or let you create an account. The difference is emphasis: A website is mostly there to be read, while a web app is built around what people do in it.
Types of web apps
Web apps come in a few formats, and knowing them makes it easier to picture what you want to build.
- Static web apps: These are made of prebuilt pages that load the same way for everyone. They’re quick and cheap to host and can still be interactive, but they lean on outside services for things like logins or payments.
- Dynamic web apps: These change based on what you do and what data you have. When you log in to a dashboard or scroll a personalized feed, you’re using a dynamic web app.
- Single-page applications (SPAs): These load a single HTML page and update content as you use the app, so it feels faster because you’re not waiting on page reloads.
- Progressive web apps (PWAs): These are web apps you can save to your phone’s home screen or your computer, where they open in their own window like any other app. Some are even listed in app stores like the Google Play Store and the Microsoft Store. Depending on the browser and device, PWAs can work offline in a limited way and send push notifications, but they still can’t reach as much of your device as a native app.
Examples of web apps
- Social media (Facebook, X): You can create posts, upload photos, and react to other people’s content, and your feed updates as new posts come in.
- Email clients (Gmail, Outlook): You send, receive, organize, and search your email without leaving the browser, and your inbox looks the same on any computer you log in to.
- E-commerce marketplaces (Airbnb, Etsy): You can search for listings, filter results, book stays, or purchase items. Sellers can log in to manage their own listings and sales data.
- Productivity tools (Notion, Google Docs): These apps let you create and share pages or documents and edit them with collaborators in real time.
What are the benefits of web apps?
The biggest advantage of a web app is what it can do with data. Bubble engineering manager Maria Posa explains:
“The benefits of web apps are really boundless. The ability to store and manipulate data and automate functionality is what powers the software that we use every day, which is truly the core of what web apps are. Buying and selling in a marketplace (like Etsy), connecting with friends in social networks (like Facebook), and keeping track of customer data (like Salesforce) are all great examples of web apps.”
Web apps turn ideas into working software
If you have an idea for a product, a web app is often how you turn it into working software.
Andrew Vernon, Lead Bubble Developer, put it this way:
“Most (if not all) people have, at some point, thought of creating a web app or have had a problem float through their mind and thought of some solution. It happens more than you might think. There are far more instances where the idea to create an app has sprung up than we may realize. Maybe you’ve dreamed of making a tool to better track youth softball team registration and organization, creating a database of all local lemonade stands in your area to organize a summer lemonade crawl, or even creating your own simplified version of Facebook for your family to stay up to date. Web apps give everyday people the ability to solve a problem for themselves or others in an easy-to-use, and easy-to-distribute way.”
You don’t have to hire developers to turn ideas like these into software. The right builder can get you there, and plenty of people have already launched apps and tools this way.
Bubble is built for exactly this. Describe your idea, and Bubble AI generates a working first version of your app, database included. From there, use the Bubble AI Agent (beta) when you want speed, or edit directly in the visual editor when you want precise control over your app’s design and logic.
Website builders like Squarespace or Wix are a different kind of tool. They’re a good fit for marketing sites and simpler online stores, but they aren’t designed for apps where people log in and work with their own data.
Web apps can be responsive and work on any device
With responsive design, a web app rearranges its layout to fit desktop, tablet, and phone screens. It won’t look right across all screens on its own, so it’s worth testing and adjusting for each one.
Bubble includes an advanced responsive editor, and elements generated by Bubble AI are responsive by default. You can then fine-tune layouts visually for desktop, tablet, and mobile experiences.
Web apps are more universal than native apps
Anyone with a modern browser can use a web app, whether they’re on a laptop or a phone. There’s nothing to install, so getting started can be as simple as clicking a link.
You can also use your web app as the foundation for mobile apps. Airbnb, for example, launched as a website in 2008 and released its first mobile app in 2010, according to the company. Today, guests can book through a browser or a mobile app.
Web apps take less time and money to build than native mobile apps
Building a native mobile app has traditionally meant building it twice, once for iOS and once for Android. Each version has its own codebase, and often its own developers, designers, and testers. Every new feature or bug fix has to be made in both places, then usually wait for app store review before users see it.
A web app skips most of that. You build one version that works in the browser, so there’s one codebase to maintain and one team to pay. When you ship an update, everyone gets it the next time they load the page.
On Bubble, there’s no codebase to maintain at all. You build visually in one editor, so a solo founder can launch a web app or a native mobile app without hiring developers. Native mobile still takes longer because of app store submission and review, but your mobile app shares its backend and database with your web app, so you’re not rebuilding your logic for each platform.
Web apps use databases to do more than websites
Databases are one of the biggest differences between a web app and a regular website. A website shows every visitor the same pages, but a web app remembers who you are and what you’ve done because it saves that information in a database. That’s how a social app builds a feed around what you’ve liked and watched, and how a project management tool knows which tasks are yours and when they’re due.
Databases also let people add their own content and connect it to everyone else’s. When a seller lists something on a marketplace, the listing is saved and linked to their account, so buyers can see who they’re buying from and the seller can manage everything they’ve posted.
On Bubble, you can set up your database visually or ask the Bubble AI Agent to build it for you, privacy rules included.
Web apps can serve a much wider audience
While a website usually serves one business and its visitors, a web app can serve an entire market. Lead Bubble Developer Andrew Vernon uses real estate to show the difference in scale:
“For founders and developers, it’s the difference between being able to build a site for one company and their users, or to build software that could serve many companies and ALL of their users. For instance, a real estate website might allow one company to post their home listings and take requests about those listings. Whereas a real estate web app (like Zillow) might allow thousands of companies to post all of their home listings, along with information about their business, and to dynamically take requests about any of those listings. The opportunities and results of the dynamic systems that come from web apps provide a massive opportunity to serve a much larger user base.”
Because every user gets their own account and data, a well-built web app can grow from a handful of people to thousands without a rebuild.
Bubble handles hosting and security behind the scenes, so going from 10 users to 10,000 doesn’t mean managing servers yourself.
Disadvantages of web apps
Web apps have a few tradeoffs compared to native mobile apps, and they’re worth weighing before you decide what to build:
- Internet dependency: Lose your signal on the subway, and most web apps stop working. PWAs can handle some tasks offline, but not everything.
- Performance: A photo editor or a fast-paced game can feel sluggish in a browser tab compared to a native app built for your phone’s hardware.
- Browser compatibility: A layout that looks right in Chrome can break in Safari, so web apps need testing across browsers. Bubble apps officially support Chrome, Safari, Edge, Firefox, and Brave on desktop and mobile web, and the responsive editor helps you adapt layouts to any screen size.
- Limited device access: Browsers can use your camera or location if you allow it, but native apps get much deeper access. On iPhone, a web app can’t even send push notifications unless you’ve added it to your home screen first.
Web app vs. website
Here are the key differences between a web app and a website:
| Web app | Website | |
|---|---|---|
| Functionality | Lets users log in, send messages, edit data, and more. | Mostly content-focused pages that visitors read. |
| User roles | Anyone can create and consume content, like posting on Instagram, listing on Airbnb, or writing on Medium. | Usually run by a site owner and read by visitors, though some support accounts, comments, or e-commerce. |
| User interaction | Interactive and dynamic, with plenty for each user to do. | More passive, built around content that's already been created. |
| Customization | Users can tailor their experience and contribute to the app. | Usually the same experience for every visitor. |
Here’s a quick test: If people need to log in and do something, like post a listing or book a stay, you need a web app. If they mostly need to read about your business, a website will do the job. For a closer look, see this breakdown of web apps vs. websites.
Web app vs. mobile app
If you’re planning a new product, you’ll probably weigh a web app against a native mobile app. The right call depends on who your users are and how fast you need to launch.
- Accessibility and distribution: Anyone with a link can open a web app, with no app store or download required. Native apps take an extra step to install, but once they’re on someone’s home screen, they’re one tap away.
- Development speed: A web app is usually faster and cheaper to get off the ground, since you’re building one version instead of separate iOS and Android apps, and you don’t have to wait on app store review.
- Device features: If your app depends on the camera, GPS, push notifications, or biometric login, native apps get deeper, more reliable access. Web apps and PWAs can use some of these, depending on the browser and device.
If your users mostly work at a desk, find you through search, or you want to test an idea fast, start with a web app. If your product depends on the camera or push notifications, or people will reach for it on the go every day, native mobile may be worth prioritizing. For more on the tradeoffs, see this guide to mobile vs. web app development.
On Bubble, you don’t have to choose up front. You can launch a web app to test your idea, then add native iOS and Android apps later without rebuilding. Native mobile is currently in beta.
How to build a web app
You don’t need to write code to build a web app anymore. Whatever tool you use, the process looks roughly the same, and this step-by-step guide to creating a web app covers each stage in more depth.
- Define your core problem: Pick the one thing your users most need to get done, and build that first. If you’re making a booking app, nail the reservation flow before you think about reviews or messaging.
- Map your data: List what your app needs to remember. A project management tool needs users, tasks, and deadlines. A marketplace needs listings, sellers, buyers, and transactions.
- Design the interface: Sketch the screens people will actually use, and keep them simple. Someone landing on your app for the first time should be able to finish the main task in seconds.
- Build the logic: Set up the workflows that make things happen, like creating an account when someone signs up or sending a confirmation email after a booking.
- Test and launch: Before you go public, have a handful of real users try the core task and watch where they get stuck. Fix the biggest snags, launch, and keep improving based on how people use your app.
On Bubble, steps 2 through 4 take minutes, not weeks. Describe your idea, and Bubble AI generates a working app with the database, screens, and workflows already built. From there, you have full control: Keep building with the Bubble AI Agent or edit any detail directly in the visual editor.
Get started building your web app today
Bubble lets you vibe code without the code, so you can launch a real web app without getting stuck in code you can’t read. Start with a prompt and let Bubble AI build the foundation, or pick a template if you’d rather begin from a proven layout.
Help is built in along the way. The Bubble AI Agent can troubleshoot issues and explain how your app works, and the Bubble Forum connects you with other builders for advice.
Start building for free today.
Frequently asked questions about web apps
What is the difference between a website and a web app?
A website is mostly informational: You read or watch content someone else created. A web app is interactive: You log in, get things done, and work with your own data.
What is the difference between a web app and a mobile app?
A web app runs in a browser, while a native mobile app is downloaded from an app store and installed on a device. Mobile apps usually have deeper access to device hardware and offline features, but web apps are generally faster to build and update.
Can I build a web app and a mobile app on the same platform?
Yes. On Bubble, you can build a web app and native iOS and Android apps in the same project, sharing one backend and database, so you can start on the web and add mobile later. Native mobile is currently in beta.
Do I need to know how to code to build a web app?
No. Bubble is a fully visual AI app builder that lets you generate a working app with AI and then visually control the interface, database, workflows, privacy rules, and logic without writing code.
Can web apps work offline?
Most web apps need an internet connection. Progressive web apps (PWAs) are the exception: They can save data on your device so some features keep working offline, and in some browsers they’ll sync your changes once you’re back online.
What is the difference between a web browser and a web app?
A web browser, like Chrome or Safari, is the software you use to get online. A web app is a program that runs inside that browser, so you open it with a URL instead of downloading anything.
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