Definition
SaaS stands for Software as a Service — it is software that you access over the internet and pay for on a recurring basis, typically monthly or annually. Instead of buying a licence and installing software on your own computers or servers, you log in through a browser and the provider handles everything: hosting, updates, security, and maintenance. Common examples include email platforms, accounting tools, CRMs, and project management software. If you are paying a monthly fee to use a tool through your browser, you are using SaaS.
Why It Matters
SaaS has fundamentally changed how businesses buy and use software. The advantages are real: no upfront infrastructure costs, automatic updates, and accessibility from any device. But there are trade-offs worth understanding. You do not own the software, so if the provider changes pricing, removes features, or shuts down, you have limited control. Your data lives on someone else’s servers, which has implications for security and compliance. And monthly subscriptions that seem small individually can add up to significant annual costs across a business. SaaS is often the right choice, but it is worth comparing against custom-built alternatives for systems that are core to your operations.
Example
A growing consultancy uses a SaaS project management tool at fifteen pounds per user per month. With forty staff, that is seven thousand two hundred pounds per year. The tool works well for standard project tracking but cannot accommodate their specific client reporting workflow, so they maintain a separate spreadsheet process alongside it. When they evaluate the total cost — subscription plus the hidden cost of the manual workaround — building a custom tool that handles both becomes a realistic alternative.