# What Is SaaS? Software as a Service Explained > What SaaS (software as a service) is, how it works, examples like Slack and Salesforce, common business models, and what it takes to build one. Canonical: https://minidev.pro/blog/what-is-saas-software-as-a-service-guide Last updated: 2026-06-17 Everything you need to know about SaaS: what it means, how it works, real examples like Slack and Salesforce, business models, and how to build your own SaaS product. What is SaaS? Subscription software built for recurring value. Quick Answer **SaaS (Software as a Service)** is a software delivery model where applications are hosted in the cloud and accessed via the internet, typically through a subscription. Instead of installing software on your computer, you access it through a web browser. Examples include Slack, Salesforce, Zoom, and Netflix. ## How SaaS Works SaaS is one of three main cloud computing service models, alongside IaaS (Infrastructure as a Service) and PaaS (Platform as a Service). #### 🖥️ IaaS **Infrastructure as a Service** - Rent virtual servers & storage - You manage OS and up - Examples: AWS EC2, Azure #### ⚙️ PaaS **Platform as a Service** - Development platform - You focus on code only - Examples: Heroku, Vercel #### ☁️ SaaS **Software as a Service** - Complete applications delivered over internet - You just use the software - Examples: Slack, Salesforce, Dropbox ### How SaaS Works (Simple Explanation) 1. **Provider builds software** and hosts it on cloud servers 2. **User signs up** and creates an account (usually free trial) 3. **User accesses software** through web browser or mobile app 4. **User pays subscription** (monthly/annually) for continued access 5. **Provider maintains everything**—updates, security, uptime ## Famous SaaS Examples You probably use SaaS products every day. Here are some of the most successful: ### 💬 Slack — Team Communication Replaced email for internal team communication. Freemium model with paid tiers for larger teams. **Result:** Acquired by Salesforce for $27.7B ### ☁️ Salesforce — CRM Pioneered the SaaS model in 1999. Customer relationship management software that runs entirely in the cloud. **Result:** $300B+ market cap ### 📹 Zoom — Video Conferencing Video meetings made simple. Freemium model with 40-minute limit on free tier drove massive adoption. **Result:** $20B+ market cap ### 🛒 Shopify — E-commerce E-commerce platform that lets anyone create an online store. Subscription + transaction fees. **Result:** $100B+ market cap · Key Insight All these SaaS products: (1) Solve a specific problem well, (2) Have simple, intuitive UX, (3) Offer freemium or free trial, (4) Use subscription pricing, (5) Started focused and expanded later. ## SaaS vs Traditional Software #### 📀 Traditional Software - Download and install - One-time purchase ($100-$1000+) - Manual updates - Only on installed devices - Local data storage #### ☁️ SaaS - Access via browser - Monthly subscription ($10-$100/mo) - Automatic updates - Any device with internet - Cloud data storage **Why SaaS won:** Lower upfront cost, always updated, accessible anywhere, no IT maintenance for users. For providers: recurring revenue, direct customer relationship, faster iteration. ## SaaS Business Models & Pricing SaaS companies use various pricing models: **💰 Per-User Pricing** Charge per user/seat. Simple and predictable. Example: Slack charges $8.75/user/month. **📊 Tiered Pricing** Multiple plans (Free/Basic/Pro/Enterprise) with increasing features. Example: Zoom Free, Pro, Business. **📈 Usage-Based** Pay for what you use. Good for variable usage. Example: AWS charges per compute hour. **🎁 Freemium** Free tier with limited features, paid upgrade for more. Great for viral growth. Example: Dropbox. ## Key SaaS Metrics MRR · Monthly Recurring Revenue · LTV · Lifetime Value · CAC · Customer Acquisition Cost **Churn Rate:** Percentage of customers who cancel. Below 5% monthly is healthy. **NRR (Net Revenue Retention):** Revenue retained from existing customers. 100%+ means growth without new customers. **LTV:CAC Ratio:** Lifetime value should be 3x+ customer acquisition cost. ## How to Build a SaaS Product 1. **Validate the Problem:** Confirm people have the problem AND will pay. 2. **Build MVP First:** Don't build full SaaS immediately. Start with MVP. [Learn about MVPs →](https://minidev.pro/blog/what-is-mvp-minimum-viable-product-guide) 3. **Choose Tech Stack:** Frontend (React/Next.js), Backend (Node.js), Database (PostgreSQL), Payments (Stripe). 4. **Implement SaaS Features:** Auth, subscriptions, billing, user roles, admin dashboard. 5. **Launch & Iterate:** Release to early adopters, gather feedback, improve. Our Recommendation **Almost always start with an MVP.** Even if you're confident, an MVP lets you validate faster and cheaper. Add SaaS features after validating core value. ## SaaS Development Cost $5K · MVP (minidev.pro) · $5K · SaaS (per month) · $75K+ · Agencies SaaS development costs more than MVP due to additional features. minidev.pro offers: MVP ($5,000 one-time) then Growth Partner ($5,000/month) for ongoing SaaS development. Thinking of building one? Start with the [7 steps to build an MVP](https://minidev.pro/blog/how-to-build-mvp-step-by-step-guide), then price it with the [MVP cost calculator](https://minidev.pro/mvp-cost-calculator). ### Ready to Build Your SaaS? Start with an MVP in 30 days, then grow with our monthly retainer. Senior developers, fixed pricing. ## Related - [What Is an MVP? Minimum Viable Product Guide](https://minidev.pro/blog/what-is-mvp-minimum-viable-product-guide) - What is MVP (Minimum Viable Product)? Complete guide with definition, examples, benefits & how to build one in 30 days. Learn from 20+ MVP launches. - [MVP vs SaaS: Which Should You Build First?](https://minidev.pro/blog/mvp-vs-saas-development-guide) - MVP or full SaaS product first? A decision framework with examples: when to validate with an MVP, when to invest in a SaaS build, and what each costs. - [MVP Development Cost 2026: Price Breakdown](https://minidev.pro/blog/mvp-development-cost-guide-2026) - What an MVP costs in 2026: agencies $50K–$150K, freelancers $8K–$25K, offshore teams $15K–$40K. What drives the price, hidden costs, and how to cut it. - [Best Tech Stack for Rapid MVP Development in 2026](https://minidev.pro/blog/tech-stack-rapid-mvp-development-2026) - The proven tech stack for building MVPs fast: Next.js, Node.js, PostgreSQL, Stripe. Why we chose these technologies for 20+ shipped projects.