What is SaaS?
SaaS stands for Software as a Service. In simple terms: it's software that runs in the cloud and is accessed through a browser (or app), without the user needing to install anything on their machine.
Instead of selling a one-time license, the SaaS model charges a recurring subscription — monthly or annual. The customer pays to use it, and the company is responsible for maintaining, updating, and scaling the system.
Google Workspace, Notion, Slack, Spotify, Canva, Trello, HubSpot. All of these are SaaS.
Why is the SaaS model attractive for businesses?
SaaS isn't just a technical choice — it's a business strategy. Unlike selling a one-off product, it generates predictable, scalable revenue. You don't need to win over the same customer every time: once they subscribe, they generate revenue month after month.
- Recurring revenue (MRR/ARR) — real financial predictability
- Scale without proportional cost — a thousand users don't cost a thousand times more than one
- Digital distribution — no logistics, no inventory, no borders
- Real-time data — you see user behavior and continuously improve
- Centralized updates — a change to the system reaches everyone immediately
How is a SaaS built?
A SaaS works as a set of layers that talk to each other. Understanding them is essential before talking about cost:
- Frontend — The visual interface the user sees and uses (React, Next.js, etc.)
- Backend — The business logic, rules, processing, and integrations
- Database — Where all information is stored securely
- Cloud infrastructure — The servers that keep everything running (AWS, Google Cloud, Vercel...)
- Payment system — Stripe, Pagar.me, or similar to manage subscriptions
- Authentication and security — Login, access control, and data protection
How much does it cost to develop a SaaS?
This is the question every entrepreneur asks — and the honest answer is: it depends heavily on scope. But it's possible to give real benchmarks.
Development is the initial cost. A SaaS has ongoing costs too: infrastructure, maintenance, support, and product evolution. Plan for a reserve of 20% to 30% of the initial investment for the first 6 months after launch.
What else impacts the cost?
- Feature complexity — Simple logic costs far less than advanced algorithms or AI
- External integrations — Every connected API (ERP, payments, WhatsApp) adds development time
- Design and UX — A generic interface is cheaper; a refined experience requires more effort
- In-house team vs. specialized company — Outsourcing to a company reduces technical risk and delivers faster
- Security and data protection requirements — Products handling sensitive data need extra layers of protection
Where should you start?
Before putting money into development, validate your idea. Talk to potential users, map out the real problem your SaaS solves, and define which features are essential for the MVP — only those that make the product usable and sellable.
The most common mistake is wanting to build everything at once. The SaaS that wins the market isn't the most feature-complete at launch — it's the one that solves one specific problem really well and continuously improves based on real usage data.
If you can't explain the value of your SaaS in one sentence, the scope is still too big.