SaaS
読み方：Software as a Service
Software as a Service. A software delivery model where applications are hosted in the cloud and accessed via the internet on a subscription basis. No installation required. Examples include Slack, Salesforce, and Notion. Dominant model for modern business software.
What is SaaS
SaaS (Software as a Service) delivers software over the internet on a subscription basis, typically monthly or annually. Users access the software through a web browser—no download, installation, or maintenance required on their end.
Key SaaS Characteristics
- • No installation: Access from any browser, any device
- • Always updated: Vendor manages all updates and maintenance
- • Subscription pricing: Predictable recurring cost
- • Scalability: Add or remove users as needs change
SaaS vs. On-Premise
| Factor | SaaS | On-Premise |
|--------|------|------------|
| Upfront cost | Low | High |
| Customization | Limited | Full |
| IT burden | Low | High |
| Data control | Vendor-managed | Self-managed |
Building SaaS Products
Key technical considerations: multi-tenancy architecture (securely isolating customer data), scalable infrastructure, subscription billing integration, and reliable 99.9%+ uptime.