What is SaaS (Software as a Service)?
SaaS (Software as a Service) is a delivery model where software runs centrally in the cloud and is used over the internet on a subscription basis. Users access it through the browser, while operation, maintenance, updates and scaling sit with the provider — without any local installation.
Also known as: Software as a Service · cloud software · SaaS platform · SaaS application
Where SaaS is used
Instead of buying software once and installing it on their own servers, companies subscribe to access a centrally operated application. The provider handles infrastructure, security, availability and new features; customers always use the latest version.
SaaS is one of the three classic cloud models alongside IaaS (Infrastructure as a Service) and PaaS (Platform as a Service). SaaS has the highest level of abstraction: customers need not worry about servers or the application platform.
A practical example
A SaaS platform for the insurance industry, for instance, bundles claims processes, documents and communication centrally. Different parties — insurers, experts, administrators — work in the same application through the browser, with role-based access and cleanly separated data. New customers can be onboarded without building a dedicated installation per customer.
Benefits & typical use cases
SaaS is especially suited to products that need to go live quickly, scale with many users and evolve continuously.
- Fast market entry without server infrastructure at the customer
- Predictable costs via subscriptions instead of large one-off investments
- Central updates — all users work with the current version
- Scalability: onboard new customers and users without rebuilding
How it differs from related terms
SaaS describes the business and delivery model. The underlying technical design is often a multi-tenant architecture, where several customers share one application. SaaS runs on cloud infrastructure (e.g. Azure) and demands particular attention to IT security, identity & access management and data protection.
How smiit works with it
smiit develops SaaS platforms from architecture to a live launch — multi-tenant, secure and scalable from day one. For Claimity AG, this produced a production SaaS MVP on Microsoft Azure in six weeks, including multi-tenant architecture, role-based access and multi-factor authentication.
Common mistakes & misconceptions
- SaaS is often equated with any cloud software, although it specifically refers to a delivery model in which the provider fully handles operation, maintenance and updates of the application.
- Many assume that outsourcing to a SaaS provider also transfers all responsibility for data protection and security, but under the shared responsibility model access control, data classification and compliance remain the customer's task.
- SaaS is wrongly seen as inherently cheaper, yet many individual subscriptions, unused licenses and integration effort can significantly raise the total cost over time.
Frequently asked questions
What is the difference between SaaS, PaaS and IaaS?
IaaS provides pure infrastructure (servers, storage, networking), PaaS adds a platform to develop and run applications, and SaaS provides a finished application. The higher the model, the less the customer has to operate themselves.
Who owns the data in a SaaS solution?
The data belongs to the customer. What matters is clear contractual terms (including data processing agreements), storage location and export options. smiit relies on GDPR-compliant architecture and hosting in the EU or Switzerland.
Is SaaS secure enough for sensitive industries?
Yes, when security is designed in from the start: secure authentication, MFA, role-based access, encryption and a hardened cloud infrastructure. In regulated industries especially, this is the precondition for a platform to scale at all.
What does multi-tenancy mean in SaaS?
Multi-tenancy means several customers (tenants) use the same application and infrastructure while their data stays strictly separated. This lowers operating costs and simplifies updates, but in return requires careful separation of data and access at the architecture level.
What happens to our data if we want to switch providers?
What matters are contractually guaranteed export options and open data formats. A forward-looking SaaS offering makes data available for export in common formats, so a switch or your own further processing remains possible without lock-in.
Related terms
Sources & further reading
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