What is a web application?
A web application is software that runs in your browser. No installation, no app store, just open a URL and get started. But what sets a web application apart from a website, and when is it the right choice? This article gives you the complete picture.
Web application in brief
A web application is an interactive software programme that runs in a web browser. Unlike a regular website, you can actively work with it: enter data, upload files, generate reports, manage tasks.
Think of Google Docs, Trello, your online banking or a CRM system. All web applications. You open a URL, log in and get to work, without installing anything. The software runs on a server, not on your computer or phone.
The difference in one sentence: a website lets you read something, a web application lets you do something.
Features of a web application
- Interactive — users carry out actions, not just read
- Login & roles — each user sees their own data and permissions
- Database-driven — stores information and retrieves it again
- Cross-platform — works on any device with a browser
- Always up to date — updates go live immediately, no downloads
- Available everywhere, requiring only an internet connection
Website vs web application vs native app
Three terms that are often used interchangeably, but are fundamentally different.
| Website | Web application | Native app | |
|---|---|---|---|
| Purpose | Informing | Carrying out tasks | Carrying out tasks |
| Interaction | Reading, clicking, viewing | Entering, editing, managing | Entering, editing, managing |
| Installation | No | No — runs in the browser | Yes — via the App Store or Play Store |
| Login | Usually not | Yes | Yes |
| Offline | Limited | Limited (unless a PWA) | Yes |
| Hardware access | No | Limited (camera, GPS via browser) | Full (GPS, camera, Bluetooth, NFC) |
| Updates | Live immediately | Live immediately | Via app store review |
| Cost | €3.000 – €15.000 | €15.000 – €100.000+ | €25.000 – €150.000+ |
| Example | appfront.nl | Google Docs, Trello | Instagram, Uber |
The boundaries are increasingly blurring. Progressive Web Apps (PWAs) combine the best of web applications and native apps: they run in the browser but can work offline and sit on your home screen. Read more about PWA vs native app →
Examples of web applications
Web applications come in all shapes and sizes. These are the most common types.
Customer portal
Customers log in to track their orders, view invoices and raise support tickets. Replaces email and phone as the primary contact channel.
Dashboard & reporting
Real-time insight into business data: revenue, stock, performance. Pulls data from multiple sources and presents it in charts and tables.
Workflow tool
Digitises internal processes: approvals, task allocation, checklists. Replaces spreadsheets and email chains with a structured system.
B2B ordering portal
Business customers place orders, view their agreed pricing and track deliveries. Integrates with your ERP system for real-time stock and invoicing.
SaaS platform
Software offered as a service to other businesses or consumers. Includes subscriptions, user management and multi-tenancy.
Scheduling & booking tool
Users schedule appointments, book services or reserve spaces. Features calendar integration, availability checks and confirmation emails.
Need a web application for your business?
We build web applications that speed up processes and keep users happy.
Discuss your projectWhen should you choose a web application?
Multiple users work with the same data
Colleagues, customers or partners need simultaneous access to the same information. A web application centralises this in a shared system.
You don't want to depend on app stores
No review process from Apple or Google, no forced updates, no 30% commission. You control everything yourself and updates go live immediately.
Cross-platform matters
Your users work on Windows, Mac, tablets and phones. A web application works wherever a browser runs: one codebase, all devices.
The process is currently manual or done in Excel
Once you notice that a spreadsheet or email chain no longer scales, it's time for a web application that gives the process structure.
Integration with other systems is required
Your web application needs to talk to your ERP, CRM, accounting software or external APIs. Web applications are naturally well suited to this via REST or GraphQL APIs.
You don't need deep hardware access
No Bluetooth, NFC or complex offline functionality needed? Then a web app is a quicker and cheaper route than a native app.
How is a web application built?
Every web application consists of three layers that work together.
Frontend (what the user sees)
The interface users work with, built with frameworks such as React, Vue or Angular. Responsible for the look and feel, forms, tables, charts and everything you click on.
Backend (the engine)
The server that handles the logic: storing data, performing calculations, checking permissions and processing API calls. Built in Node.js, Python, .NET or Go.
Database (the memory)
Stores all your data: users, orders, documents and settings. PostgreSQL and MySQL for structured data, MongoDB for flexible documents, Redis for fast caching.
Commonly used technology
- React + Node.js — versatile, huge ecosystem
- Next.js — React with server-side rendering
- Vue + Nuxt — elegant, less complex
- Astro — fast, content-first
- PostgreSQL — the standard for business applications
- Docker + Kubernetes — scalability and deployment
- AWS / Google Cloud / Azure — hosting and infrastructure
The choice of technology depends on your use case, scalability needs and team. There is no "best" stack, only the right stack for your situation.
How much does it cost to build a web application?
The costs depend on complexity, the number of user roles, integrations and design requirements.
| Type | Description | Estimate | Lead time |
|---|---|---|---|
| Simple | Dashboard or form app, 1–2 user roles, limited integrations | €15.000 – €30.000 | 6 – 10 weeks |
| Moderately complex | Customer portal or ordering platform, 3–5 roles, multiple integrations | €30.000 – €70.000 | 10 – 16 weeks |
| Complex | SaaS platform or enterprise workflow, multi-tenant, real-time data, compliance | €70.000 – €150.000+ | 16 – 30 weeks |
On top of this, there are monthly costs for hosting (€50 – €500), maintenance and ongoing development. We always recommend starting with an MVP to validate the idea before building the full platform.
How does a web app development project run?
Discovery
We map out your process, users and goals. What should the web app solve? Which systems need to be integrated? The result: a clear functional design.
UX & UI Design
We design the interface in Figma: wireframes, a clickable prototype and visual design. Tested with real users before a single line of code is written.
Development
Iterative building in two-week sprints. After each sprint you receive a working version to test. Frontend, backend and integrations grow together.
Testing & launch
Thorough quality assurance, performance testing and security checks. Phased rollout: first a pilot group, then a wider launch.
Frequently Asked Questions
Is a web application the same as a website?
No. A website is primarily intended to present information (such as a company website or blog). A web application is interactive software with which users carry out tasks: entering data, generating reports and working through processes.
Does a web application also work on mobile?
Yes. Modern web applications are responsive: they adapt automatically to the screen. On mobile they run in the browser, with no installation needed. With PWA technology you can even add them to the home screen as an app icon.
Is a web application secure?
Yes, if it is well built. Web applications use HTTPS encryption, authentication (login), authorisation (roles and permissions) and input validation. For business-critical apps we add extra layers: two-factor authentication, IP whitelisting, audit logging and penetration testing.
Can a web application integrate with our ERP or CRM?
Almost always. Most business systems (Exact Online, AFAS, Salesforce, SAP) offer APIs through which a web application can exchange data. Read more about API integrations →
When is a native app the better choice?
If you rely heavily on hardware (Bluetooth, NFC, advanced camera), offline functionality is essential, or you want to be listed in the App Store. In all other cases a web application is faster, cheaper and easier to maintain. Read the PWA vs native comparison →
What is the difference between a web application and SaaS?
SaaS (Software as a Service) is a business model: you offer your software as a subscription service. A web application is the technology behind it. Every SaaS is a web application, but not every web application is SaaS — you can also build a web app purely for internal use.
Ready to build a web application?
From customer portal to SaaS platform — we build web applications that scale with your business.
Arrange an introductory callNot sure whether a web application or a regular website is the better fit? The guide app or website will help you decide.