The difference matters more than you think. Choose wrong and you will rebuild in 12 months.
By David Friedman, Founder of AppBrewers
I have built 50+ websites and 80+ web apps. Founders ask me the same question every week: should I build a website or a web app? The answer changes everything about cost, timeline, and tech stack. Here is how to decide in five minutes.
The Simple Definition
| Website | Web App | |
|---|---|---|
| Purpose | Inform, market, sell | Do something interactive |
| Examples | Portfolio, blog, landing page | SaaS, booking system, dashboard |
| User action | Read, click, contact | Create, edit, calculate, book |
| Login required | No | Usually yes |
| Database | Optional | Required |
| Cost | 500-3,000 Euro | 3,000-25,000 Euro |
| Timeline | 1-2 weeks | 4-12 weeks |
Rule of thumb: If your users need to log in or change data, you need a web app.
When a Website Is Enough
1. You Just Need to Show Up on Google
A marketing website with good SEO is the fastest way to get found. You do not need a database. You do not need auth. You need fast load times, clear copy, and a contact form.
2. Your Product Is a Physical Service
Restaurants, salons, clinics, consultancies. Your customers book by phone or form. A website with a booking link to Calendly or a simple contact form is enough.
3. Your Budget Is Under 3,000 Euro
A custom web app starts at 3,000 Euro. A great website starts at 500 Euro. If you are pre-revenue, start with a website and upgrade later.
When You Need a Web App
1. Users Create Accounts
If your business model requires user accounts, saved data, or profiles, you need a web app. Authentication, databases, and permissions are non-negotiable.
2. You Charge a Subscription
SaaS platforms need billing, user management, admin dashboards, and role-based access. That is a web app.
3. Your Core Value Is Software
If what you sell is the tool -- a CRM, a project tracker, an AI assistant -- then you are building a web app. A website is just the marketing layer on top.
4. You Need Real-Time Data
Chat, notifications, live dashboards, collaborative editing. These require websockets, databases, and state management. Website builders cannot do this.
The Hybrid Approach (What Most Businesses Actually Need)
Most successful businesses have both:
- Website (marketing) on the root domain
- Web app (product) on a subdomain like app.yoursite.com
Example:
-
stripe.com-- marketing website -
dashboard.stripe.com-- web app for customers
This gives you the best of both worlds. SEO-optimized marketing pages on the main domain. A secure, feature-rich product on a subdomain.
Cost Breakdown in 2026
Website
| Component | DIY (No-Code) | Agency (AppBrewers) |
|---|---|---|
| Design | 0 (template) | 1,000-2,000 Euro |
| Development | 0-50/month (Webflow/Carrd) | 1,500-5,000 Euro |
| Hosting | 10-30/month | Included for 60 days |
| SEO setup | 0 | Included |
| Total | 100-500 Euro | 3,000-8,000 Euro |
Web App
| Component | DIY (Code) | Agency (AppBrewers) |
|---|---|---|
| Design | 0 (wireframe) | 2,000-4,000 Euro |
| MVP Build | 3,000-8,000 Euro | 8,000-15,000 Euro |
| Hosting | 50-200/month | Included for 60 days |
| Auth + Database | 0 (Firebase free tier) | Included |
| Billing (Stripe) | 0 (self-integrate) | Included |
| Total v1 | 3,500-9,000 Euro | 10,000-16,000 Euro |
Read our full cost breakdown: How Much Does a Web App Cost in 2026
Common Mistakes
Building a Web App When a Website Would Do
I see this every month. A founder spends 15,000 Euro on a SaaS platform before validating demand. They could have tested the idea with a 500 Euro landing page and a Typeform.
Fix: Start with a website. Add the app only after 10 paying customers.
Building a Website and Expecting App Functionality
Webflow is great. It is not a database. You cannot build Uber on Webflow. Founders hit a ceiling and have to rebuild from scratch.
Fix: Be honest about what your product needs in year one.
Ignoring SEO on the Web App
Web apps built with React or Next.js often render client-side only. Google cannot index them properly.
Fix: Use Next.js 15 with server components for marketing pages. Render critical content server-side.
How to Decide in 60 Seconds
Ask yourself three questions:
- Do users need to log in? Yes = Web app
- Is my budget over 5,000 Euro? No = Website first
- Is software my product, or marketing for my product? Marketing = Website. Product = Web app.
If you answer web app to two or more, build a web app. Otherwise, start with a website.
Our Recommendation by Stage
| Stage | Users | Build | Why |
|---|---|---|---|
| Idea | 0 | Landing page | Validate in one week |
| Validation | 0-100 | Website + waitlist | Collect emails, test demand |
| MVP | 100-1,000 | Simple web app | First paying customers |
| Growth | 1,000-10,000 | Full web app + marketing site | Scale product and acquisition |
| Scale | 10,000+ | Platform + native apps | Retention and performance |
What We Use at AppBrewers
| Project Type | Stack | Cost | Timeline |
|---|---|---|---|
| Marketing website | Next.js + static export | 3,000-8,000 Euro | 1-2 weeks |
| SaaS MVP | Next.js + Firebase + Stripe | 8,000-15,000 Euro | 4-6 weeks |
| SaaS platform | Next.js + Firebase + Supabase | 15,000-25,000 Euro | 8-12 weeks |
| Mobile app | React Native + Firebase | 8,000-18,000 Euro | 4-8 weeks |
Read our full guide: How to Build a Web App in 2026
Need Help Deciding?
We have built 130+ websites and web apps. Tell us your idea and we will recommend the right approach.
Originally published on the AppBrewers Blog.
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