The Best Tech Stack for a SaaS MVP in 2026

The fastest way to delay your SaaS launch is to spend three weeks choosing the perfect tech stack instead of shipping. Most founders we work with arrive with a list of clever options — Rust, GraphQL federations, microservices — and leave with the boring stack that actually shipped their MVP in six weeks. Here's what we'd build with in 2026, and why "boring" is the feature.

What's the best tech stack for a SaaS MVP in 2026?

For most SaaS MVPs in 2026, the right stack is **Next.js + TypeScript + Postgres

• Stripe + Resend, hosted on Vercel**. It's boring, proven, well-documented, and any developer you hire later can pick it up in a day. Deviate from this default only when you have a specific, concrete reason — not for taste.

The reason most stack debates waste time: customers don't care what you build with. They care whether the product solves their problem. Picking a familiar, deeply-supported stack means more of your time goes into the part they do care about.

The default stack, layer by layer

Frontend: Next.js + TypeScript

Next.js is the right default because most SaaS products have public marketing pages (which need SEO and fast load times) and an authenticated app section (which needs interactivity). Next.js handles both in one codebase without forcing you to bolt on SSR or routing libraries.

TypeScript is non-negotiable on anything serious. The 30-minute cost of adding types pays back the first time the compiler catches a bug that would otherwise have hit production.

We covered the React-vs-Next.js decision in detail in a separate piece — the short version: pick Next.js unless your product is entirely behind a login. If you're weighing the other modern contender, see Next.js vs Remix for a SaaS MVP.

Backend: API routes first, separate service later

For an MVP, Next.js API routes (or Route Handlers if you use the App Router) are enough. You get a backend in the same repository, the same deploy, with shared types. No second service to maintain, no separate hosting bill.

Move to a separate Node service (Express, Fastify, NestJS) only when one of these is genuinely true:

• You have long-running jobs (>30s) that don't fit Vercel's function timeouts
• You need WebSockets at scale
• A non-web client (mobile app, integration partner) needs the same API

If none of those apply, stay on API routes. We've shipped six-figure ARR SaaS products that never needed a separate backend.

Database: Postgres

Postgres is the right default for almost every SaaS MVP. It handles relational data (users, organisations, projects), it scales to millions of rows without ceremony, and it has the richest ecosystem of any open-source database.

Recommended Postgres hosts in 2026:

| Host | Best for | |---|---| | Supabase | Built-in auth + storage + realtime; great for "Firebase but Postgres" | | Neon | Serverless Postgres, pay-per-use, great for low-traffic MVPs | | Railway | Simple deploy of Postgres + other services, predictable pricing | | Vercel Postgres | Lives next to your Vercel app, simplest integration |

Skip MongoDB unless your data is genuinely document-shaped (rare for SaaS) — we make the full case in Postgres vs MongoDB. Skip SQLite for anything with concurrent writes. Skip Firestore if you ever want to leave Firebase — we weigh that exact trade-off in Supabase vs Firebase.

Auth: Clerk, Supabase Auth, or NextAuth

Pick one — don't roll your own. Authentication is the single area where "build it yourself" most often produces a security incident.

| Option | When it fits | |---|---| | Clerk | Best UX out of the box, paid from $25/mo, fastest to ship | | Supabase Auth | Free, tightly integrated with Supabase Postgres, less polished UI | | NextAuth (Auth.js) | Free, BYO database, most flexible, more setup | | Lucia | If you want to own the implementation but not the security primitives |

For an MVP that needs to ship in 8 weeks, Clerk or Supabase Auth. NextAuth if your design system requires you to control the sign-in screens visually.

Payments: Stripe

There is no second-best payments option in 2026. Stripe Checkout (hosted) for the simplest path, Stripe Elements when you need the form embedded in your own UI. Use Stripe's billing portal for self-serve subscription management — don't build that screen yourself.

Skip Paddle, Lemon Squeezy, Polar etc. for an MVP unless you specifically need merchant-of-record (they handle global VAT/sales tax for you). For a UK-only or UK+EU launch with a registered company, Stripe direct is simpler — we weigh the two in detail in Stripe vs Paddle for SaaS billing.

Transactional email: Resend

For sending email (contact form notifications, welcome emails, password resets, receipts), Resend is the modern default. Generous free tier (3,000 emails/month), great API, easy domain verification, excellent deliverability.

Alternatives: Postmark (slightly better deliverability, costs more), SendGrid (the legacy choice, more complex than it needs to be).

Avoid raw SMTP unless you specifically need to relay through your own mail server.

Hosting: Vercel for the web app

Vercel is the right default because Next.js is a Vercel product — the integration is seamless. Free tier covers most pre-revenue MVPs. When you outgrow it or have heavier backend needs, see Vercel vs AWS.

Alternatives worth knowing:

• Cloudflare Pages + Workers — cheaper at scale, more setup
• Railway / Render — better if you have non-Next services running too
• Fly.io — if you need global edge servers for non-HTTP workloads
• Your own VPS — only if you have specific compliance needs

AI: OpenAI or Anthropic via API

If your MVP needs AI features (LLM, summarisation, classification, search), call OpenAI or Anthropic via their API. Don't self-host a model for an MVP — the cost-per-call from an API is lower than the infrastructure cost of running your own until you're well into product-market-fit territory.

We cover the "should I add AI?" question in a dedicated piece — short answer: only when AI solves a problem your customers actually have.

Analytics: PostHog or Plausible + Vercel Analytics

For product analytics (who's using which feature), PostHog. For privacy-first web analytics (page views, conversions), Plausible or Vercel Analytics.

Skip Google Analytics 4 for the product side — it's optimised for marketers, not product teams.

Mobile: a responsive web app first, native later

Most SaaS MVPs do not need a native app on day one. A well-built responsive Next.js app installs to a home screen, works offline for reads, and costs nothing extra to maintain. Adding iOS and Android roughly doubles your build surface — two more release processes, two app-store review queues, and a second codebase to keep in sync with the API.

Build native from the start only when your core loop genuinely depends on the device: camera, background location, offline write, or push notifications that have to arrive reliably. When it does, we reach for React Native — it shares TypeScript and mental model with the web app, so one team can hold both. We compared the two serious options in React Native vs Flutter.

What to avoid in an MVP stack

| Tempting choice | Why to skip for an MVP | |---|---| | Microservices | Operational complexity you don't need below 10k users | | Kubernetes | Same; deploy with Vercel/Railway and revisit at scale | | GraphQL | REST + tRPC is faster to ship for a single-client app | | Custom auth | Reinventing security is how you get on haveibeenpwned | | MongoDB | Postgres handles documents fine via jsonb; rarely worth the trade-off | | Exotic frontend framework | Solid, Qwik, etc. are interesting but hire pool is small | | Self-hosted everything | You're optimising for cost when you should optimise for time |

Three of those deserve more than a table row, because they're the ones founders argue hardest for.

Microservices. The pitch is "we'll need to scale". The reality at MVP scale is that you've turned every function call into a network call you now have to authenticate, retry, version, trace and deploy. We've watched teams spend four weeks on service boundaries for a product that had eleven users. A single Next.js app with clean module boundaries splits into services later far more easily than three premature services merge back into one.

Custom auth. Every founder who builds their own sessions believes theirs will be the exception. Password reset tokens that don't expire, session fixation, missing rate limits on login, and OAuth state that isn't verified are the four we find most often in inherited codebases. Clerk costs $25 a month. A breach costs your company.

Self-hosting to save money. A £15/month VPS looks cheaper than £60 of managed services until you price the hours. Someone has to patch it, rotate certificates, restore the database when it fills the disk at 2am, and be available when it does. That's engineering time you're paying for anyway, just in a currency that doesn't show up on a card statement.

What stack should you use for your type of product?

The default stack holds for roughly 80% of SaaS MVPs — what changes by product type is usually two or three layers, not the whole thing. Here's what we'd actually swap.

| Product type | Keep from default | Change | Why | |---|---|---|---| | B2B SaaS dashboard | All of it | Nothing | This is exactly what the default is built for | | Marketplace | Next.js, Postgres, Clerk | Stripe → Stripe Connect; add a search index | Two-sided payouts and browse-heavy search | | AI-powered product | Next.js, Postgres, Clerk | Add a queue + pgvector; move long jobs off Vercel | LLM calls exceed function timeouts | | Mobile-first product | Postgres, Stripe, Resend | Next.js → Expo/React Native + a real API layer | The client isn't a browser |

B2B SaaS dashboards — internal tools, analytics products, workflow software — are the default's home turf. Relational data, org-level permissions, seat-based billing. Change nothing; ship.

Marketplaces add two hard problems the default doesn't cover. Payments become Stripe Connect (onboarding sellers, holding funds, splitting payouts, handling refunds against a balance that's already been paid out) which is genuinely a week of work rather than an afternoon. And browse quality matters commercially — Postgres full-text search is fine to launch, but budget for Meilisearch or Typesense once listings pass a few thousand.

AI-powered products break one specific assumption in the default: serverless function timeouts. A single LLM call is fine; a chain of five calls over a large document is not. Add a job queue (Inngest or Trigger.dev are the least-effort options that keep you on Vercel) and run the work asynchronously with a status the UI can poll. For retrieval, use pgvector in the Postgres you already have rather than standing up a separate vector database — it's plenty until you're well past a million embeddings. Which model provider you call is a separate decision (covered above) and, at this stage, a much less consequential one than getting the async architecture right.

Mobile-first products are the one case where the frontend choice actually inverts. If the primary client is an app, Next.js becomes a marketing site plus an API rather than the product, and you need a stable, versioned API layer from day one because you can't force users to update the app.

What does each layer actually cost to run?

At launch scale — roughly 100 to 1,000 users — the whole default stack runs at £0 to £40 a month, and realistically lands near £90 once you've outgrown the free tiers. Infrastructure is not what makes an MVP expensive; people are.

| Layer | Tool | Free tier covers | Paid entry (monthly) | |---|---|---|---| | Hosting | Vercel | Most pre-revenue MVPs | $20 / ~£16 (Pro) | | Database | Supabase | ~50k monthly active users | $25 / ~£20 (Pro) | | Auth | Clerk | 10,000 monthly active users | $25 / ~£20 | | Email | Resend | 3,000 emails/month | $20 / ~£16 | | Product analytics | PostHog | 1M events/month | Usage-based, often £0 | | Error monitoring | Sentry | 5,000 errors/month | $26 / ~£21 | | Payments | Stripe | No fixed fee | 1.5% + 20p per UK transaction | | File storage | Supabase Storage / R2 | 1GB / 10GB | ~£1–5 | | LLM API | OpenAI / Anthropic | None | £15–150, entirely usage-driven |

Two things founders consistently get wrong here.

First, most MVPs genuinely run at £0 for the first few months. The free tiers above are not trials — they're permanent, and a pre-revenue product with 200 users sits comfortably inside all of them. Don't optimise a bill you aren't paying.

Second, the LLM line is the only one that can surprise you. Every other row is a flat subscription. Token spend scales with usage and with how carelessly you prompt: sending an entire document on every request instead of a retrieved chunk is the difference between £15 and £150 a month at identical user counts. Cache aggressively, retrieve rather than stuff context, and use the cheapest model that passes your quality bar.

For context, £90/month of infrastructure is roughly 0.5% of a typical £15,000–£35,000 UK MVP build. Our own fixed-price engagements are quoted on scope and engineering time, not hosting — which is exactly the ratio you should expect.

The stack decision checklist

Before you commit to anything non-default, run it through these. If you can't answer yes to the first four, take the default.

• Can you hire for it? Search your city plus "Next.js" and then plus your exotic alternative on LinkedIn. Compare the numbers. That's your bus factor.
• Is it boring enough to have Stack Overflow answers? If the fix for your bug exists only in a Discord thread, you're paying a tax on every problem.
• Can you leave? Prefer tools with a standard export — Postgres over Firestore, S3-compatible storage over a proprietary bucket.
• Does it have a free tier that covers launch? You should not be paying for infrastructure before you have users.
• Does one person understand the whole system? If nobody can hold the architecture in their head, it's too big for an MVP.
• Does this choice save weeks, or does it save pennies? Weeks are worth buying. Pennies are not.
• Is it reversible in under a sprint? If yes, decide fast and move on — most stack decisions are far less permanent than they feel.

A complete example stack

For a typical UK SaaS MVP — say a B2B tool with auth, organisations, billing, and an email-based workflow — here's what we'd actually use:

Frontend:    Next.js 15 + TypeScript + Tailwind
Backend:     Next.js API routes (App Router or Pages Router)
Database:    Postgres on Supabase
Auth:        Clerk
Payments:    Stripe Checkout + Stripe Billing Portal
Email:       Resend (transactional) + Loops (marketing, optional)
File upload: Uploadthing or S3-compatible (Supabase Storage / R2)
Search:      Postgres full-text → upgrade to Meilisearch if needed
AI:          OpenAI or Anthropic via API (when needed)
Hosting:     Vercel
Analytics:   PostHog (product) + Vercel Analytics (web)
Monitoring:  Sentry

That's ~10 services, all with generous free tiers, all with proven integrations to each other, all with strong documentation. It'll get you from zero to first paying customer without architectural rewrites.

It's also the stack behind most of the SaaS products we build, which is the real argument for it: we've wired these exact services together enough times that the integration work is measured in hours rather than discovery. That familiarity is a large part of why a production MVP on this stack lands in 8 to 12 weeks rather than six months.

When to deviate

There are legitimate reasons to leave this stack. Specifically:

• You're building infrastructure software (databases, dev tools) — your audience expects technical sophistication; boring is bad signal.
• You have hard compliance requirements (financial services, healthcare) — your hosting and database choices may be dictated by regulators.
• You have a non-trivial real-time requirement (collaboration, trading) — the default stack works fine for most apps but not always for these.
• You already have deep team expertise elsewhere — if your CTO has shipped five Django products, Django + Next.js is a defensible choice. We compare the two backends properly in Django vs Node.js for a SaaS backend.

If none of those apply, the boring stack is the right stack.

Frequently asked questions

What is the best tech stack for a SaaS MVP?

Next.js with TypeScript on the frontend, Postgres for the database, Clerk or Supabase Auth for authentication, Stripe for payments and Resend for email, deployed on Vercel. That combination covers the requirements of the large majority of SaaS products — marketing pages that need SEO, an authenticated app that needs interactivity, relational data, subscription billing and transactional email — with no custom infrastructure and no glue code you have to maintain. It's the stack with the deepest documentation, the largest hiring pool and the most battle-tested integrations between its parts, which is precisely why it's the right default. Deviate for a concrete technical reason, never for novelty.

How much does the tech stack affect MVP cost?

Far less than founders expect on running costs — usually £0 to £90 a month at launch — but a great deal on build cost, because an unfamiliar stack can add 20 to 40% to the engineering time. The hosting bill is noise next to developer days. What actually moves the number is whether your team has shipped the stack before: every hour spent learning a framework's quirks, debugging an integration nobody has written about, or rebuilding something a mature ecosystem gives you for free is an hour you're paying for. That's one reason we quote fixed-price MVP builds on a stack we know cold — the estimate is reliable because the unknowns are.

Should you use a monorepo for an MVP?

Only if you have more than one deployable app — otherwise a single Next.js repository is simpler and faster. Monorepo tooling (Turborepo, Nx, pnpm workspaces) earns its keep when you have a web app, a mobile app and a shared API that all need the same TypeScript types, which is a real situation for mobile-first products. For a single web app where the frontend and API already live in the same Next.js project, a monorepo adds build configuration, CI complexity and a new class of dependency-resolution bugs in exchange for nothing. Start with one repo. Introduce workspaces the day you add the second deployable.

What tech stack do most YC and startup SaaS products use?

Overwhelmingly: React or Next.js on the frontend, TypeScript throughout, Postgres for data, and Stripe for payments — with Python and FastAPI appearing alongside it on AI-heavy products. The pattern is remarkably consistent across recent startup batches, and the reason is not fashion but hiring and speed: these are the tools the largest number of good engineers already know, with the fewest unsolved problems. Where startups diverge tends to be the backend language — Rails, Django and Go all show up in teams with existing expertise — but the frontend and database converge almost universally.

Can you change your tech stack later?

Yes, and some layers are genuinely cheap to swap — but the cost varies enormously by layer, so make the expensive decisions carefully and the cheap ones fast. Swapping email providers, analytics, monitoring or file storage is typically a day's work because they sit behind a thin interface. Changing your auth provider is a week or two, since you're migrating password hashes and sessions under a live product. Changing your database — especially between relational and document models — is a multi-week project that touches every query in the codebase. So the practical rule is: pick Postgres carefully because leaving it is expensive, and stop agonising over your email provider because leaving it isn't.

The bottom line

For a SaaS MVP in 2026: Next.js + TypeScript + Postgres + Stripe + Resend on Vercel. Add Clerk for auth, PostHog for analytics, OpenAI/Anthropic for AI features when relevant. Skip microservices, custom auth, MongoDB, GraphQL, and exotic frameworks unless you have a concrete reason.

The stack is a means to an end. Pick the one that gets you to customers fastest with the fewest sharp edges, then build something they actually want.

Want a specific stack spec for your idea? Book a free scoping call and we'll map the right tools to your product — including which parts of this default you should change.