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Building a SaaS in 2026 is cheaper and faster than it has ever been. The tools available today let a solo founder ship a production-quality product that would have required a team of five just three years ago. But the sheer number of options creates a new problem: decision paralysis. There are dozens of hosting platforms, hundreds of databases, and a new AI tool launching every day. You can spend weeks researching the perfect stack instead of building.

This guide gives you the exact tools for each stage of building a SaaS, from validating your idea to processing your first payment. No unnecessary options. No enterprise tools you will not need for years. Just the stack that works for a founder shipping fast in 2026.

Stage 1: Validate your idea (cost: free)

Before you write a line of code, you need to know if people will pay for what you want to build. The tools for this stage cost nothing.

  • Landing page: Carrd ($19/year) or a free Framer site. Put up a page describing your product, add an email capture form, and drive some traffic to it. If nobody signs up, you have saved yourself months of building the wrong thing.
  • Email capture: Tally (free) for forms or Buttondown (free tier) for a waitlist with email updates.
  • Customer interviews: Cal.com (free) for scheduling calls with potential users. Talk to 10-20 people in your target market. There is no tool that replaces actually listening to potential customers.
  • Competitive research: ChatGPT for quick market analysis and identifying gaps. Search Product Hunt, G2, and Reddit for what people are complaining about with existing solutions.

Stage 2: Build your MVP (cost: under 20 pounds/month)

Your MVP should do one thing well. Not three things adequately. One thing that solves a real problem for a specific group of people. Here is the stack.

Frontend and framework

Our pick: Next.js on Vercel (free). Next.js gives you server-side rendering, API routes, and a deployment pipeline that just works. The Vercel free tier handles more traffic than your MVP will see. If you prefer a different framework, Astro or SvelteKit are excellent alternatives.

If you are not a developer, Bubble or Bolt can get you to a working product without code. The tradeoff is less flexibility and higher costs at scale, but for validation they are perfectly viable. See our build without code guide for more on this path.

Database and backend

Our pick: Supabase (free). You get a Postgres database, authentication, file storage, edge functions, and real-time subscriptions in one platform. The free tier includes 500MB of database storage and 1GB of file storage. That covers most MVPs comfortably.

Alternative: Firebase if you prefer NoSQL and are building something real-time heavy. See our Supabase vs Firebase comparison for the detailed breakdown.

Authentication

Supabase Auth handles this if you are using Supabase. If you want a standalone auth provider, Clerk has the best developer experience and a generous free tier of 10,000 monthly active users. Auth0 is the enterprise standard if you want maximum flexibility.

AI coding assistant

Our pick: Cursor. An AI-powered code editor that dramatically accelerates development. The free tier gives you a meaningful number of completions and chat messages. The Pro plan at $20/month pays for itself within the first day of use. See our best AI coding tools guide for alternatives.

Version control

GitHub (free). Unlimited private repos, 2,000 Actions minutes per month for CI/CD, and project boards for task tracking. This is not a decision you need to think about.

Stage 3: Launch and get your first customers (cost: still under 20 pounds/month)

Payments

Our pick: Stripe (pay as you go). Zero monthly fee. You pay 2.9% + 30 cents per transaction (1.5% + 25p for UK cards). Stripe handles subscriptions, invoicing, tax calculation, and global payments. For most SaaS products, Stripe is the default choice and for good reason.

If you want to avoid dealing with sales tax entirely, Lemon Squeezy acts as your Merchant of Record. Higher per-transaction fees but zero tax headaches. See our Stripe vs Lemon Squeezy comparison.

Transactional email

Resend (free for 3,000 emails/month). Welcome emails, password resets, payment confirmations. The API is clean and deliverability is excellent.

Analytics

PostHog (free for 1 million events/month). Product analytics, session recordings, feature flags, and A/B testing. This is enterprise-grade analytics for free. You do not need Mixpanel, Amplitude, or Google Analytics alongside this.

Error monitoring

Sentry (free for 5,000 errors/month). When something breaks in production, Sentry tells you exactly what happened, where, and why. Essential from day one.

DNS and CDN

Cloudflare (free). DNS hosting, CDN, DDoS protection, and SSL. The only cost is your domain name at roughly 10 pounds per year.

Stage 4: Grow (cost scales with revenue)

Once you have paying customers, you can start investing in tools that help you grow. Not before.

Customer support

Start with a shared email inbox. When you outgrow that (usually around 50-100 customers), move to Chatwoot (free, open-source) or Crisp (free tier). Zendesk and Intercom can wait until you have a dedicated support person.

Email marketing

Beehiiv or Buttondown for newsletters. Loops for product-led email sequences. All have free tiers that cover early-stage needs. See our best email marketing tools breakdown.

CRM

Attio (free for 3 users) when you start managing multiple sales conversations. See our best free CRMs guide for more options.

Automation

Zapier or Make when you need to connect tools and automate workflows. See our automation tools comparison for the full breakdown.

What not to do

  • Do not build your own auth. It is a solved problem. Use Supabase Auth, Clerk, or Auth0. Rolling your own wastes weeks and introduces security risks.
  • Do not over-engineer your database. A single Postgres database handles more than you think. You do not need microservices, Redis caching, or a message queue for an MVP.
  • Do not buy premium tools before you have revenue. Almost everything you need has a free tier. Upgrade when the free tier genuinely limits you, not when you feel like you should be paying for things.
  • Do not spend three months building before talking to users. Ship your MVP in 2-4 weeks. Get feedback. Iterate. The first version will be wrong. That is normal.

The complete stack at a glance

Total monthly cost: under 1 pound until you have paying customers.

Use the Calculator to estimate costs for your specific usage, or let the Stack Builder recommend tools based on what you are building. For more on keeping costs minimal, see our cheapest SaaS stack guide.