Website vs Web App vs SaaS: What's the Real Difference?

A website introduces you. A web app solves something for you. A SaaS is a web app that charges a monthly subscription to many customers at once. All three live in a browser, but cost, team size, and build time are very different.

Here is the difference without jargon, and which one you actually need.

Website

An informational site. The visitor arrives, reads, looks at photos, maybe fills a contact form, and leaves. It does not store per-user state, has no login, and the data is not changing constantly.

Typical examples in Costa Rica:

• Corporate site for a company
• Restaurant site with menu and basic reservations
• Consultant portfolio
• Product landing page
• Blog

A small team builds it (1 designer + 1 developer) in 3 to 8 weeks. Common stacks: WordPress, Astro, Webflow, or solid static HTML. Cost in Costa Rica: $2,000-$15,000 depending on design and page count.

Web app

Software that runs in the browser. It has login, users create, edit, and query data, and the app responds with business logic. Each user sees something different based on role and data.

Examples:

• Internal inventory system for an SMB
• Booking platform for a clinic
• School management system
• Fleet control app
• Admin panel for any product

The key difference from a website: per-user state. Your cart in an online store, your booking history in a hotel, your patients in an EMR. That requires database, authentication, authorization, and ongoing maintenance.

A team of 3 to 6 people builds it (PM, designer, 1-2 devs, QA) in 3 to 9 months. Common stacks: React/Next.js, Node.js or Python, PostgreSQL. Cost in Costa Rica: $15,000-$80,000+ based on complexity and module count.

SaaS (Software as a Service)

A SaaS is a web app with two extra traits:

1. Multi-tenant: many customers (companies, not individual users) use the same application without seeing each other. Each tenant has isolated data.
2. Recurring subscription billing: the customer pays monthly or annually, not once.

Famous examples: Shopify, HubSpot, Slack, Notion. Costa Rican examples we know: vertical platforms for clinics, schools, hardware retailers, and regional fintech.

Building a SaaS involves everything a web app needs, plus extra layers: recurring billing, plans with different limits, automated onboarding, multi-tenant support, retention and churn metrics, and architecture that holds 10 customers today and 500 in 3 years without a rewrite.

More in Building a custom SaaS platform and From MVP to scale.

Cost: an MVP version starts at $40,000-$120,000 for 6 to 9 months of development. Ongoing operations add $5,000 to $30,000 monthly depending on team size and load. Not a weekend project.

3 questions to figure out which one you need

If you are not sure which category your project falls into, answer this:

1. Do users need to log in?

• No: probably a website.
• Yes: web app or SaaS.

2. Will you sell the same software to multiple companies on a subscription?

• No, you or your company will use it internally: web app.
• Yes, you want 20, 100, or 1,000 companies paying monthly: SaaS.

3. Does the data shown change per user or is it the same for everyone?

• Same for everyone (corporate text, photos, publicly visible product catalog): website.
• Different per user (their dashboard, their orders, their reports): web app or SaaS.

Those 3 questions solve 90% of cases.

Cost ranges in Costa Rica

Typical Costa Rican market ranges, rounded, no promises:

Type	Initial setup	Time	Team
Simple landing	$2,000-$5,000	2-4 weeks	1-2 people
Corporate site	$5,000-$15,000	4-8 weeks	2-3 people
Internal web app	$15,000-$50,000	3-6 months	3-5 people
Complex web app	$50,000-$150,000	6-12 months	4-7 people
SaaS MVP	$40,000-$120,000	6-9 months	4-6 people
Mature SaaS	$200,000+	12-24 months	6-12 people

For deeper build timelines, see How long does it take to build a professional website? and the pillar What is web development?.

If what you need is custom software beyond a site, our custom software development service covers web app and SaaS end to end.

If you are unsure, we will tell you in 20 minutes

Send us a paragraph on what your business does, the problem you want to solve, and who will use it. In a 20-minute call we tell you which category your project falls into, the realistic budget you need, and whether to start now or validate first through other channels. Reach out here.