What Is SaaS? How Software as a Service Works and Why It Matters

SaaS, or software as a service, is software you use through a web browser or app and pay for by subscription, instead of buying a licence and installing it on your own computers or servers. The provider hosts the software, keeps it secure, fixes bugs and ships new features, so customers always use the latest version. Email, CRMs, accounting tools, project management and video calling are common examples. For businesses, SaaS means lower upfront cost and faster start; for software companies, it means recurring revenue and a direct relationship with customers.

Key Takeaways

• SaaS is hosted by the provider and accessed over the internet, usually on a monthly or annual subscription.
• Benefits for customers: low upfront cost, quick setup, automatic updates and access from anywhere.
• Drawbacks: ongoing fees, less control over features and data, and dependence on the vendor.
• Most SaaS products are multi-tenant: many customers share one system, with their data kept separate.
• AI is changing SaaS products and pricing, with more automation and more usage-based billing.

How SaaS Works

A SaaS product runs on the provider's cloud infrastructure. When you log in, you are using the same application as every other customer, but you only see your organisation's data. This shared design is called multi-tenancy, and it is what lets SaaS providers serve thousands of customers efficiently. Our multi-tenant SaaS database design guide explains how that separation is built.

Behind the interface, a typical SaaS product has:

• A web or mobile front end.
• A backend that handles business logic and APIs.
• Databases, file storage and background workers.
• Billing that manages subscriptions and invoices.
• Monitoring, backups and security controls.

Cloud platforms make this possible at scale; see why cloud infrastructure powers modern SaaS.

SaaS vs Traditional Software

• Installation. Traditional software is installed on each computer or server. SaaS runs in the browser or a lightweight app.
• Payment. Traditional software is usually a one-time licence plus maintenance fees. SaaS is a recurring subscription.
• Updates. Traditional software needs manual upgrades. SaaS updates continuously.
• Access. Traditional software is often tied to one device or office. SaaS works anywhere with an internet connection.
• Maintenance. Traditional software is maintained by your IT team. SaaS is maintained by the provider.

Benefits of SaaS for Businesses

• Lower upfront cost. No large licence purchase or hardware.
• Fast setup. Many tools can be running the same day.
• Automatic updates. Security patches and new features arrive without IT work.
• Scalability. Add or remove users as the team changes.
• Remote access. Teams can work from any location and device.
• Integrations. Most SaaS tools connect to others through APIs.
• Predictable spending. Subscriptions are easier to budget than one-off purchases.

Drawbacks to Consider

• Ongoing cost. Subscriptions continue for as long as you use the product and often rise with users.
• Less control. The vendor decides the roadmap, features and pricing.
• Data and compliance. Your data sits on the vendor's systems, so check where it is stored and how it is protected.
• Fit. You may need to adapt your process to how the tool works.
• Vendor risk. Price changes, feature removals or shutdowns affect you directly.

When these drawbacks outweigh the benefits, custom software may be the better option. We compare the two in SaaS vs custom software.

Common Types of SaaS

• Horizontal SaaS serves many industries with the same function: CRM, accounting, HR, communication.
• Vertical SaaS serves one industry deeply, such as clinics, restaurants or logistics. See our guide to vertical SaaS.
• Micro-SaaS is a small, focused product run by a tiny team; see the micro-SaaS founder playbook.

For how SaaS companies charge, read SaaS business models explained.

Why SaaS Keeps Growing

• Businesses prefer operating costs over large capital purchases.
• Remote and hybrid work needs software that works anywhere.
• Cloud infrastructure has made it cheaper to build and run SaaS products.
• Recurring revenue is attractive to founders and investors.
• Integrations let companies assemble the tools they need.

Where SaaS Is Heading

AI built into products

SaaS tools are adding copilots, document understanding and automation inside the product. Read how AI is changing mobile apps and SaaS products.

New pricing models

As AI lets customers do more with fewer people, per-seat pricing is under pressure, and many vendors are moving to usage-based or hybrid pricing. See AI agents and seat-based SaaS pricing.

More focus on security and data residency

Larger customers expect certifications, audit logs and control over where data is stored.

Building a SaaS Product

If you are planning to build a SaaS product rather than buy one, start with our guide to building a SaaS product step by step. At Mavani Solution, SaaS MVPs start from $6,000 and typically take 8 to 16 weeks. Learn more about our SaaS development services.

Frequently Asked Questions

What is SaaS in simple terms?

SaaS is software you use over the internet and pay for by subscription. The provider hosts and maintains it, so you don't install anything or manage servers.

What are examples of SaaS?

Common examples include email and office suites, CRMs, accounting software, project management tools, video conferencing and e-commerce platforms. Any software you log into through a browser and pay for monthly or annually is likely SaaS.

What are the main benefits of SaaS?

The main benefits are low upfront cost, quick setup, automatic updates, access from anywhere, easy scaling of users and integration with other tools.

What are the disadvantages of SaaS?

Ongoing subscription costs, less control over features and pricing, data stored with the vendor, the need to adapt your process to the tool, and dependence on the vendor's future.

Is SaaS the future of software?

For most business software, yes. SaaS is the default way new business tools are delivered, and it is evolving with built-in AI, usage-based pricing and stronger data controls. Custom software still has a place for core processes that need to be unique.