What Is SaaS (Software as a Service)?
SaaS stands for Software as a Service: a model where you use an application over the internet by paying a recurring fee, without installing anything on your own computers or managing the servers it runs on. Instead of buying a license and running the program on your own infrastructure, you log in with a username and password from a browser, and the provider handles making sure everything works, gets updated, and stays available.
Gmail, a cloud CRM, or the invoicing system you pay for every month are all examples of SaaS: you pay while you use it, and if you stop paying, you lose access. Understanding what SaaS is comes before deciding whether your business should subscribe to a tool like that or build its own custom software instead.
How Does the SaaS Model Work?
In the SaaS model, the provider hosts the application on its own servers, or in the cloud through AWS, Google Cloud, or Azure, maintains the code, applies security updates, and responds when something breaks. The customer only needs an internet connection and a browser: no installing software, no managing databases, and no hiring anyone to keep servers running.
Billing is almost always by subscription, monthly or annual, charged per user, per amount of data, or per feature tier across basic, professional, and enterprise plans. That spreads the cost out over time instead of requiring a large upfront investment, and it's exactly what sets the SaaS model apart from buying a traditional software license as a one-time purchase.
SaaS Examples You Use Every Day
These are typical SaaS examples across different kinds of businesses:
- Email and productivity: Gmail, Microsoft 365, Google Workspace.
- Sales and customers: a cloud CRM to track leads and customers.
- Finance and operations: a cloud ERP that connects inventory, purchasing, and accounting.
- Communication: Slack, Zoom, WhatsApp Business.
- Payments: payment gateways that run as a service, with nothing to install on the business side.
They all share the same trait: you don't buy the software, you pay to use it for as long as you need it, and the provider decides when and how it gets updated.
SaaS vs Traditional Software
The difference in SaaS vs traditional software comes down to who controls the infrastructure and how it's paid for:
- Deployment: SaaS runs in the provider's cloud; traditional (on-premise) software gets installed on the company's own servers.
- Payment: SaaS is a recurring fee; traditional software is usually a one-time license, plus the cost of maintaining it.
- Updates: with SaaS, the provider pushes them automatically; with on-premise software, your IT team decides when and how to update.
- Customization: traditional software, or a custom build, adapts fully to your processes; a generic SaaS product only lets you configure what the provider decided to expose as configurable.
- Data: with SaaS, your data lives on the provider's servers; with on-premise software, you decide where and how it's stored.
Neither model is automatically better: it depends on how standard your process is and how much control you need over your data.
Advantages of the SaaS Model
- Fast start: you sign up and start using it the same day, with no months-long development wait.
- No infrastructure to maintain: you don't need your own servers or a team dedicated to keeping them running.
- Spread-out cost: you pay as you go, instead of a large investment upfront.
- Updates included: the provider fixes bugs and ships new features without you having to do anything on your end.
- Access from anywhere: all you need is internet and a browser, useful for remote teams or businesses with several locations.
Disadvantages and Risks of the SaaS Model
- You depend on the provider: if they raise prices, change features, or shut down the service, your operation is affected directly.
- Limited customization: you can only configure what the provider allows; if your process differs from most of their other customers, you end up adapting your business to the software instead of the other way around.
- Cost that adds up long-term: a monthly fee that looks cheap can, over a few years, exceed what a custom build would have cost.
- Data outside your direct control: you depend on the provider's security and privacy policies, and on how easy it is to export your data if you decide to switch systems.
- Limited integrations: connecting a generic SaaS product with your other systems sometimes takes extra work, or simply isn't possible.
When It Makes Sense to Build Your Own SaaS
Subscribing to an existing SaaS product makes sense when your process is similar to any other business your size: email, video calls, or a generic CRM don't justify reinventing the wheel.
Building your own software, on the other hand, makes sense when:
- Your process is different from your competitors', and that difference is exactly your competitive edge.
- You've already tried several SaaS products on the market and none fit without forcing you to change how you work.
- Your user or data volume is high enough that a SaaS subscription ends up costing more, over the medium term, than building your own.
- You need full control over where your data lives, whether for security, compliance, or simply as a business decision.
- You eventually want to offer your own tool as a service to your customers, not just use it internally.
A good starting point before building a full SaaS product is validating the idea with an MVP: a first version with just the essentials, letting you test whether the model works before investing in every feature. This also applies if your business has already gone through a digitalization process and now needs a tool that no SaaS on the market covers quite as well.
Frequently Asked Questions
What is SaaS in simple terms?
It's a model where you use software over the internet by paying a recurring fee, without installing it or managing the servers it runs on: the provider handles all of that.
What's the difference between SaaS and the cloud?
The cloud is the infrastructure, the remote servers something runs on; SaaS is a type of service delivered using that infrastructure. Every SaaS product uses the cloud, but not everything in the cloud is SaaS.
What SaaS examples does a typical business use?
Email (Gmail or Microsoft 365), communication (Slack, Zoom), a CRM for sales, and in many cases, the invoicing or payroll system they run in the cloud instead of installing on their own server.
Is SaaS cheaper than building your own software?
Almost always at the start, since there's no development investment involved. Over the medium and long term it depends on your user volume and how well the SaaS fits your process: a monthly fee multiplied across several years can exceed the cost of a custom build.
Can I migrate from a SaaS product to my own software later?
Yes, though the effort depends on how easy it is to export your data from the current SaaS product. That's why it's worth checking, from the moment you subscribe to a SaaS product, whether it lets you export your information in a format you can reuse later.
If you've already evaluated several SaaS products and none fit how your business actually works, at AISDC we build custom software that adapts to your process instead of forcing you to change how you operate, with full control over your data and no monthly fee that grows with every new user.