What is SaaS? SaaS stands for Software as a Service. It is a way of delivering software through the internet instead of requiring customers to install and maintain the entire application on their own computers or servers.
When you open an online document editor, manage projects through a website, or access your company’s customer records in a cloud application, you may be using SaaS.
The idea is simple: the provider operates the software, while you access its features through a browser or compatible application. But the business model involves important decisions about pricing, security, data ownership, reliability, and long-term costs.
This guide explains how SaaS works, where it fits within cloud computing, its advantages and disadvantages, and how to choose a service that meets your needs.
What Is SaaS in Simple Terms?
Software as a Service is a software delivery model in which a provider hosts and operates an application and makes it available to customers over a network, usually the internet.
Customers generally pay through a subscription, although some SaaS products offer free plans, usage-based pricing, or other arrangements.
Consider an accounting application. With traditional installed software, a business might purchase a license, install the program, maintain its computers, and arrange its own updates and backups.
With a SaaS accounting service, the provider operates the application on its infrastructure. Employees sign in to manage invoices, expenses, and financial records.
The company still needs to configure accounts, control permissions, protect credentials, and verify that the service meets its requirements.
In other words, SaaS reduces some technical responsibilities. It does not eliminate the customer’s responsibility for using software securely and effectively.
How Does SaaS Work?
A SaaS application combines software, computing infrastructure, storage, networking, and user access into a managed service.
Step 1: The Provider Hosts the Application
The SaaS company operates its software on cloud infrastructure or other managed computing systems.
Those systems process requests, store information, and deliver application features to customers.
Step 2: The Customer Creates an Account
A person or organization registers for the service, selects a plan if necessary, and creates authorized user accounts.
Business customers may also configure departments, teams, permissions, and security policies.
Step 3: Users Access the Software
Users generally open a website or supported application and authenticate with their credentials.
The service processes their requests remotely and returns the relevant information or interface.
Step 4: Data Is Stored and Processed
The application may store documents, customer records, settings, or other information on the provider’s systems.
Exactly where data is stored, how it is encrypted, and who can access it depend on the service and contract.
Step 5: The Provider Maintains the Service
The provider typically manages the underlying infrastructure, application deployment, server maintenance, and many software updates.
Customers still need to manage user access, data classification, integrations, and their own operating procedures.
Step 6: The Subscription or Service Agreement Continues
Customers use the service under the provider’s pricing and contractual terms.
Fees may depend on user count, storage, transaction volume, features, or actual usage.
To understand the infrastructure behind these services, read our guide to cloud computing explained for beginners.
Real-World Examples of SaaS
SaaS is used in personal productivity, education, communication, sales, finance, and business operations.
| Software category | Examples | Typical purpose |
|---|---|---|
| Office productivity | Google Workspace, Microsoft 365 online services | Documents, email, and collaboration |
| Customer relationship management | Salesforce | Sales opportunities and customer records |
| Project management | Asana, Trello | Tasks, deadlines, and teamwork |
| Communication | Slack, Microsoft Teams | Messaging and meetings |
| Website and commerce platforms | Shopify | Managing an online store |
| Design and collaboration | Canva | Creating visual content |
| Accounting | Cloud accounting applications | Invoices and financial reporting |
These examples represent common service categories. Product capabilities, available plans, and licensing arrangements can change.
Not every feature of every product is necessarily delivered through SaaS. Some companies combine locally installed applications with cloud services.
How Is SaaS Different From Traditional Software?
The biggest difference is who operates and maintains the application and its supporting infrastructure.
Traditional on-premises software may run on computers or servers owned or managed by the customer.
SaaS applications are operated by a service provider and accessed remotely.
| Feature | SaaS | Traditional on-premises software |
|---|---|---|
| Application hosting | Managed by provider | Managed by customer or its contractor |
| Initial deployment | Often relatively quick | May require installation and configuration |
| Updates | Typically deployed by provider | Usually scheduled or managed by customer |
| Payment model | Often recurring or usage-based | May involve licenses and maintenance fees |
| Internet dependency | Usually important | Depends on architecture |
| Infrastructure control | Limited by provider offering | Potentially greater customer control |
| Customization | Within supported configuration and APIs | May allow deeper changes |
| Data migration | Depends on export capabilities | Depends on software and data formats |
Neither model is universally better. The appropriate choice depends on business requirements, existing infrastructure, available expertise, and financial considerations.
What Is the Difference Between SaaS, PaaS and IaaS?
Cloud computing includes several service models. Three common categories are SaaS, Platform as a Service (PaaS), and Infrastructure as a Service (IaaS).
SaaS: Use a Finished Application
SaaS delivers an application that customers can use without managing the underlying servers or application runtime.
Examples include online email, customer management, and collaboration tools.
PaaS: Build and Deploy Applications
Platform as a Service provides an environment where developers can create, deploy, and operate applications without managing every infrastructure component.
Customers remain responsible for their application code, data, and relevant configuration.
IaaS: Rent Computing Infrastructure
Infrastructure as a Service provides computing resources such as virtual servers, networking, and storage.
Customers typically manage more of the operating system, software, and security configuration.
| Model | What the customer receives | Typical customer |
|---|---|---|
| SaaS | Ready-to-use application | Individuals and business teams |
| PaaS | Application development and deployment environment | Developers and software teams |
| IaaS | Computing, storage, and network resources | IT and infrastructure teams |
The boundaries between these models are not always rigid. A provider may combine features from several categories.
What Is Multi-Tenancy in SaaS?
Multi-tenancy is an architectural approach in which a software system serves multiple customers, often called tenants, using shared application or infrastructure resources.
Imagine an office building. Different companies occupy separate offices while sharing elevators, utilities, and building services.
A multi-tenant SaaS system can similarly share computing resources while keeping customer information logically separated.
For example, two businesses may use the same project management platform, but each should see only its own authorized projects and users.
Why Do SaaS Providers Use Multi-Tenancy?
Shared infrastructure can improve resource utilization, simplify software maintenance, and support efficient service delivery.
However, multi-tenancy requires carefully designed access controls and isolation mechanisms.
Is Every SaaS Application Multi-Tenant?
No. Some SaaS providers offer dedicated instances or other isolation arrangements.
The architecture depends on the service, customer requirements, and commercial offering.
To understand how applications organize their information, see what a database is and how it stores data.
What Are the Main Benefits of SaaS?
1. Lower Initial Infrastructure Requirements
Customers generally do not need to purchase and maintain servers solely to operate the application.
This can reduce upfront technical investment, although subscriptions and implementation services still create costs.
2. Faster Access to Software
Many SaaS applications can be activated quickly after registration.
Complex business systems may still require substantial configuration, migration, integration, and employee training.
3. Remote Access and Collaboration
Authorized users can often access SaaS applications from multiple locations and devices.
This supports remote work, shared documents, and distributed teams.
4. Provider-Managed Updates
Providers usually deploy application updates and infrastructure improvements.
Customers should still review changes that affect integrations, workflows, or compliance requirements.
5. Flexible Capacity
Some SaaS services make it easier to add users, storage, or features.
However, scalability depends on the provider’s technical capacity, plan limits, and contractual conditions.
6. Access to Specialized Tools
Smaller organizations can use sophisticated software without developing an equivalent application internally.
Examples include customer management, analytics, accounting, and document collaboration.
What Are the Disadvantages and Risks of SaaS?
1. Ongoing Subscription Costs
Monthly fees may appear manageable but accumulate over time.
Costs can increase as teams grow or advanced features become necessary.
2. Dependence on Internet Connectivity
Many SaaS services require a reliable internet connection.
Some provide offline features, but availability varies.
3. Vendor Lock-In
Moving information and workflows from one provider to another can be difficult.
Proprietary data formats, integrations, and customized processes may increase switching costs.
4. Limited Control Over Infrastructure
Customers typically cannot control every aspect of the provider’s servers, software releases, or maintenance schedule.
5. Service Outages
Even established providers can experience disruptions.
Businesses should understand uptime commitments, incident communication, and contingency options.
6. Privacy and Compliance Concerns
Data may be stored or processed in locations subject to different legal requirements.
Organizations should examine data processing agreements, retention practices, and available regional controls.
7. Account and Integration Risks
Compromised accounts, excessive permissions, or insecure integrations can expose sensitive information.
Security therefore depends on both the provider and the customer.
How Much Does SaaS Cost?
SaaS pricing varies widely by industry, product, and customer requirements.
There is no universal monthly price.
Common SaaS Pricing Models
| Pricing model | How it works | Potential concern |
|---|---|---|
| Per user | Fee for each licensed user | Costs increase as teams grow |
| Tiered subscription | Different plans offer different features | Important features may require upgrades |
| Usage-based | Charges depend on transactions or consumption | Monthly bills may fluctuate |
| Freemium | Basic service is free; advanced features cost extra | Free plans may have strict limits |
| Enterprise contract | Negotiated terms for larger organizations | Long commitments and minimum purchases |
| Hybrid pricing | Subscription plus usage or add-on charges | Total cost can be harder to predict |
Example: Calculating SaaS Subscription Costs
Imagine a company with 20 employees purchasing software at an illustrative price of $18 per user per month.
The calculation is:
20 users × $18 = $360 per month
$360 × 12 = $4,320 per year
Over three years, the subscription alone would total:
$4,320 × 3 = $12,960
This is a hypothetical example, not a current price quote for a particular provider.
The actual cost may also include implementation, data migration, training, integrations, taxes, support, and future price increases.
What Is the Total Cost of Ownership?
Total cost of ownership, or TCO, includes the full cost of adopting and operating a service over a defined period.
For SaaS, a practical TCO estimate should consider:
- Subscription fees
- Additional user licenses
- Storage and usage charges
- Implementation and configuration
- Data migration
- Employee training
- Integration development and maintenance
- Premium support
- Compliance and security administration
- Data export and switching costs
Comparing subscription prices alone can lead to a misleading purchasing decision.
Who Is Responsible for SaaS Security?
SaaS security is a shared responsibility.
The provider generally manages the underlying application infrastructure and many technical protections.
The customer remains responsible for how its users access the service and how information is configured, classified, and shared.
| Security activity | Typical responsibility |
|---|---|
| Physical data center security | Provider and its infrastructure partners |
| Application infrastructure maintenance | Provider |
| Service-side vulnerability remediation | Provider |
| User account permissions | Customer, within available controls |
| Multifactor authentication configuration | Customer, supported by provider |
| Employee security awareness | Customer |
| Data classification and sharing rules | Customer |
| Incident response coordination | Both parties |
Actual responsibilities depend on the contract, service design, and applicable laws.
What Security Features Should You Look For?
Useful features may include:
- Multifactor authentication
- Role-based access control
- Encryption in transit and at rest
- Audit logs
- Administrative security settings
- Data export and retention controls
- Documented incident response procedures
- Independent security assessments where relevant
A provider’s certifications or audit reports can support due diligence, but they do not guarantee that breaches are impossible.
Read our explanation of cybersecurity and how it protects your data for additional background.
What Should a SaaS Service Level Agreement Include?
A service level agreement, or SLA, describes certain commitments concerning service performance and availability.
For example, a provider may state a monthly availability target and define the conditions under which service credits apply.
Before signing, review:
- How uptime is calculated
- Which outages are excluded
- Scheduled maintenance provisions
- Support response commitments
- Service credit eligibility
- Incident notification procedures
- Data backup and recovery arrangements
- Contract termination provisions
A service credit does not necessarily compensate a business for its full operational losses.
How to Choose the Right SaaS Provider
Selecting a SaaS application should begin with the problem you need to solve, not with a list of advertised features.
Step 1: Define the Business Requirement
Describe the work the application must support.
For example, a small consulting firm might need project tracking, document sharing, time reporting, and client access.
Step 2: Identify Essential Features
Separate mandatory capabilities from optional conveniences.
A long feature list is not useful if the product fails at the tasks your team performs every day.
Step 3: Check Compatibility
Determine whether the service integrates with your existing software and supports your devices.
Some integrations use APIs, which allow applications to exchange information under defined rules.
Learn how this works in our guide to APIs and how applications communicate.
Step 4: Evaluate Security and Privacy
Ask where data is processed, what protections are available, and how access is controlled.
For sensitive information, involve the appropriate security, legal, or compliance specialists.
Step 5: Calculate the Three-Year Cost
Estimate subscription, implementation, integration, training, and growth costs.
Use realistic scenarios rather than assuming your team size and usage will remain unchanged.
Step 6: Test the Application
Use a trial or pilot project where possible.
Ask representative employees to complete actual tasks, rather than simply reviewing a demonstration.
Step 7: Review Data Portability
Check whether you can export information in usable formats.
Understand what happens to data when the subscription ends.
Step 8: Review the Contract
Examine renewal terms, price changes, service commitments, support conditions, and termination requirements.
A Practical SaaS Evaluation Checklist
Use the following questions when comparing potential providers.
| Evaluation area | Question to ask |
|---|---|
| Functionality | Does it support our essential workflows? |
| Usability | Can employees complete tasks without excessive training? |
| Security | Are access controls and authentication appropriate? |
| Privacy | Where is our information stored and processed? |
| Reliability | What availability and recovery commitments exist? |
| Integrations | Does it work with our current systems? |
| Pricing | What will the total cost be over three years? |
| Support | How quickly can we obtain assistance? |
| Data portability | Can we export our records in usable formats? |
| Contract | What happens if prices change or we cancel? |
When Is SaaS a Good Choice?
SaaS may be a strong option when an organization needs software quickly, has limited infrastructure resources, and values managed updates and remote access.
Common situations include:
- Small businesses adopting accounting or customer management tools
- Remote teams collaborating on shared projects
- Organizations that need standardized business applications
- Companies seeking to reduce direct infrastructure administration
- Teams that need flexible user licensing
However, suitability depends on the application’s capabilities, data requirements, and total cost.
When Might SaaS Be the Wrong Choice?
Traditional or dedicated software arrangements may be preferable when:
- Reliable internet connectivity is unavailable
- Strict technical or regulatory requirements cannot be met
- Deep customization is essential
- The organization needs direct control of specific infrastructure components
- Data portability or contract terms are unacceptable
- The long-term financial comparison favors another model
A hybrid approach may also be appropriate, combining SaaS services with locally managed applications.
Common SaaS Mistakes to Avoid
Choosing Software Based Only on Monthly Price
A low subscription price can become expensive when important features, storage, or integrations require upgrades.
Ignoring Data Export Before Signing
Data migration is easier to plan before information becomes deeply embedded in a platform.
Giving Every Employee Administrator Access
Excessive permissions increase the consequences of mistakes and compromised accounts.
Assuming the Provider Handles Every Security Task
Customers must still configure access, monitor usage, and protect their own accounts and information.
Skipping Employee Training
Even well-designed software can create errors when users do not understand the correct workflow.
Failing to Review Renewal Terms
Automatic renewals, minimum commitments, and notice periods can affect the cost of changing providers.
Frequently Asked Questions About SaaS
What Does SaaS Stand For?
SaaS stands for Software as a Service, a model for delivering applications through a managed service.
Is SaaS the Same as Cloud Computing?
No. SaaS is one cloud service model. Cloud computing also includes infrastructure, development platforms, and other services.
Is SaaS Always Subscription-Based?
No. Subscriptions are common, but some providers use free plans, usage-based charges, or other pricing arrangements.
Do I Need to Install SaaS Software?
Not always. Many SaaS products work through a web browser. Others provide optional or required desktop and mobile applications.
Can SaaS Work Offline?
Some services offer limited offline features, but many functions require connectivity.
Is SaaS Secure?
SaaS can be operated securely, but actual security depends on the provider’s controls, the customer’s configuration, and user behavior.
Who Owns the Data in a SaaS Application?
Data rights and responsibilities depend on the contract, applicable law, and type of information. Customers should review the agreement rather than assume every provider uses identical terms.
Can a SaaS Provider Access My Data?
Provider access depends on the service architecture, operational procedures, contractual restrictions, and available encryption controls.
What Happens if a SaaS Provider Shuts Down?
Customers may need to export data and migrate to another service. This is why portability and continuity planning matter.
Is SaaS Better for Small Businesses?
It can reduce technical complexity and upfront infrastructure requirements, but small businesses should still compare costs and operational needs.
What Is Vendor Lock-In?
Vendor lock-in occurs when switching providers becomes difficult because of data formats, integrations, contractual terms, or dependence on specialized features.
Can I Cancel SaaS at Any Time?
Not necessarily. Cancellation rights depend on the plan and contract. Some agreements have minimum terms or renewal requirements.
How Do SaaS Companies Make Money?
Common revenue sources include subscriptions, usage charges, enterprise contracts, and additional services.
Is SaaS Only for Businesses?
No. Individuals also use SaaS for productivity, education, communication, and other activities.
Official Sources and Further Reading
These resources provide additional technical and security context:
- NIST: The NIST Definition of Cloud Computing — foundational definitions of cloud computing and its service models.
- CISA: Secure Cloud Business Applications Project — guidance and resources for securing cloud business applications.
- Cloud Security Alliance — cloud security research, guidance, and industry resources.
Conclusion
Understanding what SaaS is helps individuals and businesses make better software decisions.
Software as a Service provides access to applications operated by external providers. It can simplify deployment, reduce direct infrastructure management, and support collaboration across different locations.
However, SaaS also introduces recurring expenses, reliance on vendors, data portability challenges, and shared security responsibilities.
Before choosing a service, define your requirements, test its capabilities, review the contract, examine security controls, and calculate the total cost over several years.
The best SaaS solution is not necessarily the one with the most features or the lowest monthly price. It is the service that meets your needs reliably, securely, and at a sustainable total cost.
