What is SaaS?

SaaS is one of the most common words in modern IT, and your business likely already uses a handful of SaaS services without calling them that. In short, it’s ready-made software you subscribe to and access over the web, without installing or operating anything yourself. Here’s what the term means and what the choice involves.

Software you rent instead of own

You used to buy a program on disk, install it on every computer, and be responsible for keeping it running yourself. SaaS flips that model. The program lives with the vendor, runs in the cloud, and you access it through the browser for a recurring fee – typically per user, per month.

You install nothing and operate nothing. If you log in, you’re always on the latest version, because updates are rolled out centrally by the vendor. What used to be a one-time investment becomes a subscription, similar to going from owning a car to leasing one.

This simplicity is exactly why SaaS has taken over. The barrier to getting started is low, you skip running your own IT operations, and the cost becomes predictable and easy to scale as the business grows or shrinks.

Examples you’re probably already using

SaaS sounds abstract until you see how many everyday tools actually are one. A few examples most companies already rely on:

• Email and calendar in the cloud – no email server of your own to manage.
• Accounting and invoicing – finance software you log in to through the browser.
• CRM – a system for keeping track of customers, deals, and contacts.
• Project and collaboration tools – for tasks, files, and communication in teams.

What they all have in common is that you never think about servers, versions, or installation. You open a browser, log in, and work. That’s SaaS in practice.

What you skip – and what you give up

SaaS is a trade-off, not a pure win. It’s worth seeing both sides before putting an ever-larger share of the business into rented services.

What you skip is significant: no operations of your own, no servers to monitor, no updates to plan and test. Security patches and new functionality arrive automatically, and the cost is easy to calculate. For most businesses, that’s exactly right – time is better spent on the core business than on IT maintenance.

What you give up is control. A SaaS service is the same product for every customer, so the ability to tailor it to your specific processes is limited. Your data also sits with the vendor, which makes data protection and export options questions you need to ask up front. If data lock-in arises, switching services down the line can become complicated and expensive. And even though each individual subscription feels cheap, many services combined can easily add up over the years to more than an in-house solution would have cost.

SaaS or build your own?

The decisive question is how unique the process is. If it’s support that looks the same across every company – finance, email, payroll – a ready-made SaaS service is nearly always right. Someone has already solved the problem better and cheaper than you can on your own.

If the need instead sits close to what makes you unique, where no standard service quite fits, an in-house system can pay off despite the higher cost. The difference in one sentence: with SaaS, you adapt your business to the service; with an in-house system, the system adapts to your business. One path is fast and cheap but narrow; the other is more expensive but flexible.

An interesting detail is that many product companies that build their own solutions sell them as SaaS themselves – the model is therefore both something you buy and something you can deliver. A company can very well run its finance and CRM as SaaS while also running its own product as a SaaS service for its customers. The line between being a buyer and a vendor isn’t sharp.

The practical advice is not to get stuck in either-or. Most businesses run a mix: ready-made SaaS for the generic parts, and in-house for what genuinely sets them apart. The art lies in drawing the line in the right place – and in always checking how you get your data out before you tie a central process to a service.

Want to sort out what you should buy as a ready-made service and what deserves to be built for your business? At Weapp we’re happy to look at the whole picture and talk through the choices before you decide.