What Is SaaS (Software as a Service)?
In short
SaaS products are cloud-hosted software that customers access via web browsers and pay for through subscriptions. Building a SaaS product varies based on complexity. SaaS generates recurring revenue, scales efficiently, and is the dominant software delivery model for modern businesses.
At a glance
- Revenue Model
- Monthly/annual subscriptions
- Architecture
- Multi-tenant cloud-hosted
- MVP Cost (UK)
- Bespoke Quote
- Billing
- Stripe subscription integration
SaaS: SaaS (Software as a Service) is a software distribution model where applications are hosted in the cloud and accessed by customers via web browsers on a subscription basis. SaaS products serve multiple customers from a single codebase using multi-tenant architecture.
How SaaS Works
SaaS is the dominant model for modern software delivery. Instead of installing software on individual computers, users access the application through a web browser. The software provider hosts the application, manages updates, handles security, and ensures availability. Customers pay a monthly or annual subscription fee. SaaS products use multi-tenant architecture where a single instance of the application serves multiple customers while keeping their data separate. This model benefits both providers (predictable recurring revenue, single codebase to maintain) and customers (no installation, automatic updates, lower upfront cost).
Business Context
The global SaaS market is highly valued. For businesses building SaaS products, the subscription model provides predictable recurring revenue that investors value highly. For businesses using SaaS products, the model offers lower upfront costs and reduced IT overhead. However, long-term SaaS licensing costs can exceed custom software development costs, particularly for products with per-user pricing.
Technical Context
SaaS products are built as web applications with multi-tenant database architecture (typically PostgreSQL with schema or row-level isolation), subscription billing (usually Stripe), authentication and user management (Clerk, Auth0), and cloud hosting. js or Python backends.
Real-World Examples
B2B Project Management SaaS
A multi-tenant platform where businesses manage projects, tasks, and team collaboration with subscription-based pricing tiers.
Analytics & Reporting SaaS
A platform that connects to customer data sources and provides automated dashboards, reports, and insights.
Booking & Scheduling SaaS
An appointment management platform for service businesses with online booking, calendar sync, and payment processing.
Learning Management System
An education platform with course creation, student tracking, assessments, and certification management.
Advantages and Limitations
Strengths
- Recurring revenue model with predictable income
- Single codebase serves unlimited customers
- Global accessibility via web browser
- Automatic updates without customer installations
- Scalable infrastructure with cloud hosting
- Lower customer acquisition friction
Trade-offs
- Requires ongoing hosting and infrastructure costs
- Customer data security is your responsibility
- Churn management is critical for sustainability
- Feature requests from multiple customers must be balanced
Common questions
How much does it cost to build a SaaS product?
What is multi-tenant architecture?
How long does it take to build a SaaS product?
Should I build an MVP first?
Related Concepts
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