SaaS (Software as a Service) is a program you use over the internet, usually in a browser, by paying a subscription instead of buying it and installing it on your computer. The provider hosts it, updates it and keeps it running. You log in and work.
If you have a Gmail inbox, an online calendar or a tool for sending newsletters, you already use SaaS. In this guide we look at how it works, what its benefits and risks are, how to pick the right one, when a ready-made SaaS is not needed and how a SaaS is born when nothing off the shelf fits.
How does SaaS work?
The software does not live on your computer. It lives on the provider's servers, meaning computers connected to the internet that the provider manages: you reach it with a browser or a dedicated app. According to Cloudflare, people who use SaaS subscribe to an application instead of buying it once and installing it. They can use it from any compatible device.
Payment is usually a monthly or yearly fee, as Brevo's guide explains. The same text describes many SaaS products as "multi-tenant": several customers share the same infrastructure, but each one's data and settings stay separate. Think of an apartment building: the structure is shared, every flat has its own door.
The provider handles the updates. You download nothing and you do not buy a new license when you change computer. Cloudflare lists exactly this among the benefits: no manual updates, access from anywhere and no reinstalling.
What are examples of SaaS you already know?
The examples named by Cloudflare and Brevo are Gmail and Office 365 for email and documents, Slack for team communication, Dropbox for files, Mailchimp and Brevo for email marketing, Salesforce for customer management. Brevo also lists whole categories: customer management programs (CRM), project management, video conferencing, document sharing and human resources.
What they share is simple: you open a page, log in, work. Nobody asks you to install a server or understand what happens inside.
Why is it called "as a service"?
Because what you pay for is the ongoing use of the software and everything behind it: servers, updates, fixes and maintenance. When you cancel the subscription, you generally lose access as well. With a license bought once, the program stays on your computer, while with SaaS it stays wherever the provider keeps it.
Hypothetical example: a shop uses a SaaS for bookings for two years, then decides to switch. If the customer data can be exported to a readable file, moving to the new tool is feasible. If it cannot be exported, it has to be retyped one record at a time. That is why the question about exporting matters more than one more feature.
SaaS, PaaS and IaaS: what is the difference?
They are the three main models of cloud services. The cloud is the set of computers connected to the internet that host programs and data in place of your own computer. According to Capterra:
- IaaS (Infrastructure as a Service): you rent basic computing resources, such as servers, storage and networks, without owning the hardware. The provider takes care of maintenance and updates.
- PaaS (Platform as a Service): you use a platform to build and run applications, without investing in infrastructure and operating systems.
- SaaS: you use ready-made software over the web, with a recurring fee, without installing it on your device.
As a rule of thumb, if you do not build software for a living, the model that concerns you is almost always SaaS. The other two matter mostly to people who build software.
What are the benefits of SaaS?
- You start fast. Upfront costs are low, because you pay a fee instead of having the program built or buying it (both Brevo and Money.it stress this).
- You use it from anywhere. A compatible device and a connection are enough.
- The provider does the maintenance. Less work for anyone without an IT department.
- It grows with you. Cloudflare says the provider handles the growth in storage and computing power, while Brevo mentions the option to add or remove features as needs change.
What are the drawbacks and risks?
- Dependence on the provider. Cloudflare calls it vendor lock-in: moving data and processes to another application can take a lot of time and money. Before subscribing, ask how you export your data.
- Access becomes the delicate point. If the program is online, who can log in matters. An active account of a former colleague is an open door.
- Security depends on the provider. For large companies, Cloudflare writes, this is a problem because they often cannot verify it directly. For small businesses the same text treats it as a minor drawback, because large providers have more resources. It is still worth reading what they state about data protection.
- Pay-as-you-go spending is hard to predict. Money.it points out that with usage-based payment it can be hard to work out the total in advance.
- You need an internet connection. If the network goes down, so does access.
When is a ready-made SaaS not needed?
There are cases where the subscription adds a cost without removing a problem. First: you use the program a few times a year and a spreadsheet is enough. Second: your way of working is so particular that adapting to software built for others costs you more time than it saves. Third: by choice or by internal rule, your data must stay under your direct control.
Hypothetical example: a four-person carpentry shop manages quotes with a shared spreadsheet. It works. Moving to a SaaS with ten features nobody uses means one more subscription and a new habit. The right moment comes when the spreadsheet starts to break: lost quotes, different versions of the same file, nobody knowing which is the latest.
How do you choose a SaaS without regrets?
These are practical suggestions of our own, to adapt to your case:
- Start from the problem you want to solve, rather than the list of features.
- Check whether you can export your data in a readable format, before entering a lot of it.
- Read how the price is calculated: per user, per feature or by usage.
- If there is a free trial, use it on a real case and not on a convenient example.
- Decide who can log in and who manages the accounts, former colleagues included.
- Check what the provider states about personal data protection and where it stores it.
Many SaaS products now include artificial intelligence features to automate repetitive tasks: Brevo lists this among the benefits of the model. Before paying for these features, read AI agents for small businesses: when you need them and when you don't.
What to do when no SaaS fits your case?
There are two roads. The first: connect the tools you already use, so they pass data to each other on their own. Automations do this. The second: build a custom tool, which can be an internal management system or a SaaS of your own to offer to others.
Hypothetical example: an events agency uses three different SaaS tools for quotes, calendar and invoices. It retypes the same data by hand every time. Before building something new, it is worth checking whether an automation linking the three tools solves the problem. If instead none of the three understands its way of working, then a custom management system is worth considering.
How a SaaS is born: from idea to product
On the Sarabi.Cloud SaaS page the path comes in stages. It starts with the MVP, the minimum that proves the idea interests people: the essential features, done well and put in front of real users right away. Then comes the beta, with the first users trying the product and feedback that decides what to add and what to cut. Finally scaling: when the numbers confirm the product, you invest in performance, new features, automations and integrations. You move to the next stage only after checking the market.
For management systems and internal tools the page describes a similar method: real processes are analyzed before writing code, only the necessary features are built, email, calendar and invoicing are integrated. Growth starts from the most urgent problem. If you want to know how we work on websites tied to a product, there is also the page on websites.
SaaS frequently asked questions
Is SaaS the same thing as an app? An app is a program you install on a phone or computer. SaaS is a way of delivering software: it can have an app, a website or both.
Is SaaS secure? It depends on the provider. According to Cloudflare, responsibility for security passes to the provider, so it is worth reading what it states about data protection and access. Manage your passwords and accounts well too.
How much does SaaS cost? It depends on the product. The fee is usually monthly or yearly, per user or based on usage. There is no figure that fits everyone: compare plans and check how the price is calculated.
What happens to my data if I stop paying? It depends on the provider's terms, which you should read before signing up. Cloudflare warns that switching applications can take a lot of time and money, so ask in advance how to export your data.
Can I have a SaaS of my own? Yes, starting from an MVP and checking the market at every stage, as described above.
If you have a product idea or a process that no ready-made software handles well, write to us at info@sarabi.cloud: tell us in two lines what you want to achieve and where you stand. More guides are in the blog index.
Sources: Cloudflare, Brevo, Money.it, Capterra.
Have a similar case or a doubt? Write to us at info@sarabi.cloud.