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📖Definitions & Explainers

What is SaaS? Software as a Service Explained

9 min readJanuary 8, 2026By Spawned Team

Understanding the SaaS business model, how it works, and why it has become so popular.

What is SaaS?

SaaS (Software as a Service) is software delivered over the internet on a subscription basis. Instead of buying and installing software, you access it through a web browser and pay monthly or annually.

How SaaS Works

For Users

  1. Sign up online
  2. Access through browser (no installation)
  3. Pay monthly/annually
  4. Automatic updates
  5. Cancel anytime

For Providers

  1. Build software once
  2. Host it on servers
  3. Sell access to many customers
  4. Update for all users simultaneously
  5. Recurring revenue

SaaS vs Traditional Software

Traditional Software

  • One-time purchase
  • Install on your computer
  • Manual updates
  • Works offline
  • You manage backups

SaaS

  • Subscription payment
  • Access via browser
  • Automatic updates
  • Requires internet
  • Provider manages everything

Why SaaS Became Dominant

For Users

  • Lower upfront cost
  • No IT management
  • Always up-to-date
  • Access from anywhere
  • Easy to try and cancel

For Providers

  • Predictable recurring revenue
  • Lower distribution costs
  • Direct customer relationship
  • Usage data for improvement
  • Faster iteration

Examples of SaaS

Productivity

  • Google Workspace
  • Notion
  • Slack

Business

  • Salesforce (CRM)
  • HubSpot (Marketing)
  • QuickBooks (Accounting)

Design

  • Figma
  • Canva

Development

  • GitHub
  • Vercel
  • Spawned

SaaS Business Metrics

Key Metrics

  • MRR: Monthly Recurring Revenue
  • ARR: Annual Recurring Revenue
  • Churn: Customers who cancel
  • LTV: Lifetime Value of a customer
  • CAC: Cost to Acquire a Customer

Healthy SaaS

  • LTV > 3x CAC
  • Monthly churn < 5%
  • Net revenue retention > 100%

Building a SaaS Product

With Spawned

  1. Describe your SaaS idea
  2. AI generates the application
  3. Add Supabase for backend/auth
  4. Add Stripe for payments
  5. Launch to Spawned's discovery

Key Features Needed

  • User authentication
  • Dashboard
  • Core functionality
  • Billing/subscriptions
  • Settings/profile

Key Takeaways

  1. SaaS = software accessed online via subscription
  2. Better for most users and providers
  3. Recurring revenue is the key advantage
  4. You can build SaaS products with AI builders like Spawned
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