What Is SaaS? Benefits, Limitations, and Key Considerations Before Choosing
Looking back, enterprise software usage used to be complicated and more expensive than necessary. Organizations had to spend large budgets to install programs on every device, hire teams to maintain systems continuously, and stop work whenever problems occurred or updates were needed while waiting for technicians to fix issues or install new versions.
Today, access to software such as accounting systems, CRM systems, project management systems, and other applications can be made simple through SaaS (Software as a Service), an innovation that allows businesses of all sizes to access high-quality software more easily, cost-effectively, and flexibly than ever before.
What Is SaaS (Software as a Service)?
SaaS (Software as a Service) is a software delivery model provided through the internet. Users do not need to install or maintain the system themselves. They can access the software immediately through a web browser or application and pay monthly or annually based on the selected package.
On Amazon Web Services infrastructure, SaaS providers can develop and deliver applications with flexibility, security, and the ability to scale quickly as user demand grows. AWS helps manage infrastructure, networking, security, and availability, allowing developers to focus fully on application development and business value creation.
Read more: What Is Cloud Storage? How to Choose a Cost-Effective and Secure Option in 2026
How Is SaaS Different from Installed Software (On-Premise)?
SaaS and installed software (On-Premise) differ in terms of usage, investment, and maintenance.
On-Premise Software
Installed and stores data on servers inside the organization.
Organizations must purchase permanent or one-time licenses.
Servers, updates, and troubleshooting are handled by the organization's internal IT team.
Access is limited to the corporate network or requires VPN configuration.
SaaS Software
Usable from anywhere through the internet, without installing software on devices.
Paid monthly or annually according to the selected package.
The provider handles maintenance and updates, so the organization does not need a large IT team.
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How SaaS Works
SaaS works on a multi-tenant architecture, where a provider can use one shared infrastructure and software platform to serve multiple customers at the same time. Each customer's data and configurations are securely separated.
The entire system is hosted on a cloud platform, such as AWS EC2 for computing and Amazon S3 for data storage.
When users log in through a web browser or application, commands and data are sent to servers on the cloud for processing, and the results are returned to the user's device in real time.
Benefits of SaaS That Make Modern Businesses Choose It
SaaS offers several advantages, including cost savings, flexibility, and ease of use.
No Need to Invest in Infrastructure (Servers, Data Centers)
Businesses do not need to purchase servers, build data centers, or install large database systems because these services are fully managed by the SaaS provider. This plays an important role in helping organizations save budget, especially SMEs and startups with limited budgets.
Lower Long-Term IT Costs
SaaS also reduces costs for maintenance, hardware upgrades, and IT personnel required to manage systems. Organizations simply pay monthly or annually, which makes budgeting more predictable and allows packages to be adjusted based on changing needs.
Accessible Anywhere, on Any Device
SaaS is designed to support remote work. Users can access software from anywhere with an internet connection, whether on a computer, tablet, or smartphone. This helps improve organizational productivity, especially in an era where working from anywhere has become normal.
Supports Business Scalability
As a business grows, traditional software may not be able to handle a massive increase in data volume. SaaS can support business expansion easily by upgrading a package or increasing the number of users through the provider's system.
Automatic Feature Updates
SaaS services typically include automatic system updates, feature improvements, and security patching. This allows businesses to use the latest software version with new features and updated security without downloading or installing additional software.
SaaS Limitations and Precautions
Although SaaS helps organizations work more easily and efficiently, there are several limitations and considerations, including:
Dependence on the internet. Users need a stable internet connection to use SaaS.
Customization limitations. SaaS is often designed to support general use cases.
Data privacy and compliance may affect privacy-related legal requirements.
On-demand usage requires careful and disciplined budget planning.
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SaaS Software Security Checklist Before Using It in a Company
Before adopting SaaS in an organization, businesses should carefully check system security. Otherwise, important data may be exposed and cause serious impact.
Data encryption: encryption while data is in transit and at rest, and encryption standards.
Authentication: support for Multi-Factor Authentication (MFA) and SSO (Single Sign-On).
Access control: detailed user permission management and assignment of access to specific data areas.
Backup: automatic backup, backup frequency, and recovery procedures.
Standards and certifications: security certifications and personal data protection laws.
Monitoring and logging: systems that record data access, changes, and audit trails.
Data center location: where data is stored, legal implications, and impact on access speed.
SLA (Service Level Agreement): service availability guarantees and compensation when systems are down.
Third-party security: penetration testing or security audits by external companies.
Incident response plan and response team in case of data leakage or cyberattacks.
How Is SaaS Different from PaaS and IaaS?
Many people may be confused about the differences between SaaS, PaaS, and IaaS. Here are the strengths and characteristics of each service model.
SaaS (Software as a Service): Ready-to-Use Software
SaaS is software that is ready to use immediately without requiring organizations to install it themselves. The provider manages everything from infrastructure and operating systems to the application. Users simply open a web browser or application and can start using it. It is suitable for users who do not have much technical knowledge.
PaaS (Platform as a Service): A Platform for Application Development
PaaS is a platform that helps developers build and run applications without worrying about infrastructure. Developers only need to write code and upload applications. It provides a moderate level of control and is suitable for developers who want to focus on coding rather than server management.
IaaS (Infrastructure as a Service): Cloud-Based IT Infrastructure
IaaS provides foundational infrastructure such as virtual servers, storage, and networking. Users must install and manage systems themselves, but they do not need to purchase or maintain physical hardware. It is suitable for organizations with IT teams that have the expertise to control systems themselves.
What Types of Businesses Are Suitable for SaaS?
SaaS is not suitable for every type of business, but it is especially appropriate for:
SMEs and startups with limited budgets and no large IT team.
Organizations that need digital transformation to improve work efficiency.
Businesses that want to reduce the IT team's workload so teams can focus on work that creates more business value.
Organizations that need high flexibility, have remote employees, or operate multiple branches.
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How to Choose SaaS for Your Organization
Choosing the right SaaS requires organizations to consider several factors that affect long-term usage, including:
Choose based on use case. Assess the purpose of SaaS usage, such as collaboration, internal communication, customer and sales management, project management, or insight analytics.
Consider security and standards. Check security standards, data encryption, automatic backups, data recovery, and compliance with personal data protection laws.
Check integration with existing systems. Ensure smooth integration, API availability for data exchange, and a clear data migration approach.
Choose a trusted cloud provider such as AWS (Amazon Web Services) for strong infrastructure, high security, fast access, and support for business growth.
Build SaaS on AWS with Confidence Through Guidance from SiS
Choosing SaaS is one of the key factors that helps businesses grow sustainably by reducing costs, increasing work agility, reducing infrastructure limitations, and enabling competition with major players in the global market. This is especially true when businesses implement SaaS systems and plan operations appropriately according to organizational needs.
SiS Distribution, as a trusted AWS Distributor in Thailand, is ready to provide comprehensive consultation and guidance on AWS usage for SaaS systems. This includes planning an architecture that fits your business, selecting services that meet requirements and budgets, providing 24-hour support from an experienced expert team, and offering security guidance to ensure your system can operate efficiently.
Frequently Asked Questions
What is SaaS and is it difficult to use?
SaaS, or Software as a Service, is software used through the internet without installing it on a device. It is easy to use. With an internet connection and access through a web browser or application, users can start using it immediately without complicated maintenance.
How secure is SaaS?
High-quality SaaS solutions include multiple layers of security, such as data encryption, backup, and regular security monitoring. Organizations should check standard certifications and personal data protection compliance before adoption.
Is SaaS suitable for large enterprises?
Many large enterprises use SaaS, especially for systems that do not require extensive customization, such as email, CRM, HRM, or analytics systems. SaaS also offers additional features for large organizations, such as large-scale user management, advanced customization, and service level agreements.
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