SaaS (Software as a Service)

1. Definition

• SaaS = a software delivery model where applications are hosted in the cloud and accessed by users over the internet (usually via subscription).
• Instead of buying software once and installing it on-premises, customers pay monthly or yearly fees to use it.

Examples: Salesforce, Slack, Zoom, Dropbox, HubSpot.

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2. How SaaS Works

• Vendor hosts software on its own servers (cloud-based).
• Users log in via web/app → no installation or hardware needed.
• Subscription pricing → recurring revenue stream.
• Vendor handles maintenance, updates, scaling, and security.

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3. Key Features

• Recurring Revenue Model → predictable cash flow.
• Accessibility → available anywhere with internet.
• Scalability → easily add/remove users.
• Lower upfront cost for customers vs traditional licenses.

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4. Advantages (for companies)

• High gross margins (70–90% typical).
• Scalable → adding new users costs very little.
• Customer data → helps improve product & upsell.
• Global reach → no physical distribution needed.

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5. Challenges

• High CAC (Customer Acquisition Cost): marketing and sales-heavy.
• Churn risk: losing subscribers hurts recurring revenue.
• Continuous investment: must keep innovating & supporting.
• Competition: many SaaS niches are crowded.

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6. Key SaaS Metrics

• ARR (Annual Recurring Revenue) = normalized yearly subscription revenue.
• MRR (Monthly Recurring Revenue) = normalized monthly subscription revenue.
• Churn Rate = % of customers (or revenue) lost each month/year.
• Net Revenue Retention (NRR) = expansion – churn + upsell (ideally > 100%).
• Gross Margin = (Revenue – COGS) ÷ Revenue.
• CAC (Customer Acquisition Cost).
• LTV (Customer Lifetime Value).
• LTV:CAC ratio (healthy if ≥ 3).
• Rule of 40 → Growth % + Profit Margin % ≥ 40%.

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7. SaaS Valuation

• Often valued on revenue multiples (EV/Revenue), not profits (since many SaaS are not profitable yet).
• High-growth SaaS companies can trade at 10×+ ARR if metrics are strong.

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Summary:
SaaS = Software as a Service. Instead of buying and installing software, customers pay subscriptions to access cloud-based apps. SaaS offers recurring revenue, high margins, and scalability — but requires high customer acquisition spending and careful churn management.