Best Free Tools for Launching a SaaS in a Weekend — The $0 Stack

You don't need money to launch a SaaS. You need a weekend, a laptop, and the right free tiers.

This isn't a theoretical list. Every tool here runs real production apps serving real customers at $0/month. I've used most of them to build fromscratch.dev, and the ones I haven't used are recommended by founders I trust.

The $0 stack at a glance

Framework & hosting: Next.js + Vercel

Next.js is the framework. It gives you server components, API routes, static generation, and a full backend — all in one project. No need for a separate API server. The App Router is the current standard, and every AI coding tool understands it deeply.

Vercel hosts it for free. Push to git, Vercel deploys automatically. You get:

• 100 GB bandwidth/month
• 100 hours of serverless compute
• Automatic HTTPS
• Global CDN
• Preview deployments for every PR

Alternative: Netlify. Same concept, slightly different pricing model. Both work great. I use Netlify for fromscratch — either is a solid choice.

For a detailed comparison, see Vercel vs Netlify and best deployment platforms.

Database: Neon or Supabase

You need a database. Both options give you serverless Postgres on a free tier.

Neon gives you 0.5 GB storage with autosuspend compute — your database sleeps when nobody's using it and wakes up on the first request. Best for: pure database needs with maximum control.

Supabase gives you 500 MB storage plus auth, storage, and realtime bundled in. Best for: moving fast with fewer tools to configure.

Both use standard Postgres, so you can migrate between them later if needed.

See Neon vs Supabase and best database tools for the full comparison.

Authentication: Clerk or Supabase Auth

Every SaaS needs login. Don't build it yourself — auth is a solved problem with free solutions.

Clerk gives you 10,000 monthly active users free. Pre-built login components that you drop into your app. Social login (Google, GitHub, Twitter), magic links, MFA — all included. The DX is excellent and the UI looks professional out of the box.

Supabase Auth is included if you're already using Supabase for your database. It handles email/password, social login, and session management. Slightly more setup than Clerk but zero additional cost.

See Clerk vs Auth0 and best authentication providers.

Payments: Stripe

Stripe charges zero monthly fees. You only pay per transaction: 2.9% + 30¢ per card charge. For a SaaS with $0 revenue, Stripe costs $0.

Stripe's subscription billing handles:

• Monthly and annual plans
• Free trials
• Proration when users switch plans
• Automatic retry on failed payments
• Customer portal for self-service billing management

You don't need Stripe until you're ready to charge. Set it up the weekend before you launch your paid plan.

Why not Lemon Squeezy or Paddle? Both are Merchant of Record services that handle global tax compliance for you. They're worth considering if you're selling globally, but their fees are higher (5-8% vs Stripe's 2.9%). For a weekend launch, Stripe is simpler.

See Stripe vs Lemon Squeezy, Stripe vs Paddle, and best payment processors.

Email: Resend

Resend gives you 100 emails/day and 3,000/month free. That's enough for:

• Welcome emails
• Password resets
• Payment receipts
• Basic transactional notifications

The API is clean, the React email SDK lets you build templates in JSX, and deliverability is solid.

When you'll need more: When you want to send marketing emails or newsletters, you'll need a dedicated tool like ConvertKit or Beehiiv. But for transactional email, Resend's free tier is plenty for early stage.

See best email marketing tools.

Analytics: PostHog

PostHog gives you 1 million events/month free. For a new SaaS, that's months of runway before you need to think about paying.

You get:

• Page views and user sessions
• Custom event tracking
• Funnels and user paths
• Feature flags
• Session replay (limited on free)

Why not Google Analytics? You can use both. GA4 is good for SEO data (search queries, ranking positions). PostHog is better for product analytics (what do users do inside your app). Both are free.

See the PostHog review and best analytics tools.

AI coding: Cursor

Cursor's free tier gives you 2,000 completions per month. For a weekend project, that's more than enough. The AI will help you:

• Scaffold components from descriptions
• Debug errors by pasting the stack trace
• Generate boilerplate (API routes, database queries, form handling)
• Write tests

For heavy daily usage, you'll want the Pro plan at $20/month. But for a weekend sprint, free is fine.

See best AI coding tools and best vibe coding tools.

Design: Figma

Figma's free tier gives you 3 projects with unlimited drafts. For a SaaS, you probably need one project — your app's design system.

Use Figma for:

• Wireframing your key screens before coding
• Creating social media graphics
• Designing a logo (or use their community templates)

If you're not a designer, check out best design tools for non-designers for tools that require less design skill.

Automation: n8n (self-hosted)

n8n is a workflow automation tool — like Zapier, but open source and free when self-hosted. Use it for:

• Sending Slack notifications when a new user signs up
• Syncing data between tools
• Scheduling recurring tasks

Self-hosting requires a server (Railway's free tier works), but once running, it's unlimited workflows with no per-execution cost.

See n8n vs Zapier.

The $0 → $50/month upgrade path

At some point, you'll outgrow free tiers. Here's the typical upgrade sequence:

Notice the pattern: you don't pay until you have real users. And by the time you're paying $50/month, you should have enough customers to cover it. This is the beauty of usage-based and freemium pricing — the tools grow with your revenue.

verdict

You don't need funding, a credit card, or a DevOps engineer to launch a real SaaS. The tools in this list run production apps serving thousands of users at $0/month. Start building this weekend. Upgrade when your revenue justifies it. The only thing stopping you from launching is launching.

The weekend launch checklist

Ready to build? Follow the full SaaS launch checklist for a phase-by-phase guide from idea validation through launch day and beyond.