Best Database for a SaaS Startup (2026)

PostgreSQL is the best database for SaaS in most cases: it handles relational data (users, billing, workspaces) cleanly, supports JSONB for flexible fields, and has the widest tooling and hosting ecosystem. Reach for MySQL if your team already knows it well or you're inheriting a MySQL-based stack. Reach for MongoDB when your core data is document-shaped and rarely needs cross-table joins.

A SaaS database is the system that stores and manages the persistent state behind a subscription product: accounts, subscriptions, permissions, and whatever your product tracks over time. Get this choice right early and you save yourself a migration later. Get it wrong and you'll be rewriting queries mid-growth, which is its own special kind of ops tax.

Which database fits which SaaS use case?

Note: The comparisons below reflect general, publicly documented capabilities as of July 2026. Databases and managed platforms change their offerings regularly, so check each project's own docs for current specifics.

Why Postgres is the best database for SaaS by default

Most SaaS products are fundamentally relational. Users belong to workspaces, workspaces have subscriptions, subscriptions have billing events. That's a graph of foreign keys, and Postgres was built for exactly that.

Postgres also gives you an escape hatch. Need to store an object with a shape that varies row to row (webhook payloads, feature flags, integration configs)? JSONB lets you keep that data in the same database instead of standing up a second one. You get relational guarantees where you need them and flexibility where you don't, in one system. See PostgreSQL's official documentation on JSON types for the specifics: https://www.postgresql.org/docs/current/datatype-json.html.

Pro tip: Default to normalized relational tables for your core billing and account data. Use JSONB columns for the genuinely variable stuff, not as a shortcut to skip schema design.

The ecosystem argument matters too. Every major ORM (Prisma, Drizzle, TypeORM), every managed host (RDS, Supabase, Neon, Render, Fly), and most SaaS boilerplates default to Postgres. That consistency makes it the safest bet when you don't yet know what your data model will look like in a year. If you're comparing it directly against the alternative most teams ask about, our <a href="/blog/postgres-vs-mysql">Postgres vs MySQL breakdown</a> goes deeper on the tradeoffs.

When MySQL makes more sense

MySQL brings a different set of tradeoffs, and for some teams those tradeoffs are the right call.

If your team has years of production MySQL experience, or you're building on top of an existing MySQL-based CMS or e-commerce platform, staying in that ecosystem avoids a real cost: relearning operational quirks, backup tooling, and query patterns under a different engine. Familiarity is a legitimate technical reason to stay on the stack you know.

MySQL's replication story is mature and well understood, and its hosting options are just as broad as Postgres's. Where it tends to lag is native support for advanced types (arrays, richer JSON operators) and some of Postgres's more advanced indexing options. For a straightforward SaaS schema, that gap rarely matters. For our full side-by-side, see <a href="/blog/postgres-vs-mysql">Postgres vs MySQL</a>.

When MongoDB makes more sense

MongoDB fits when your data doesn't want to be a table. Event logs, product catalogs with wildly different attributes per item, or content that's naturally nested (a document with embedded sub-documents) can be more awkward to model relationally than to just store as documents.

Modern MongoDB supports multi-document transactions, so the "no real transactions" objection is dated. What's still true: it has no enforced schema by default, which is a feature until your data model grows inconsistent across records and nobody notices until a query breaks. Cross-collection joins are also weaker than a relational join, and heavy relational modeling in MongoDB tends to fight the tool.

If most of your core data is accounts, subscriptions, and permissions, and only a slice of it is document-shaped, you're usually better off with Postgres plus JSONB for that slice, rather than running two databases. Our <a href="/blog/mongodb-vs-postgres">MongoDB vs Postgres comparison</a> covers the decision in more detail.

Managed Postgres vs self-hosting

Once you've picked Postgres, the next decision is who runs it.

Self-hosting (your own instance on a VM, or a bare-bones managed Postgres from your cloud provider) gives you full control over configuration, extensions, and cost at scale. It also means you own backups, upgrades, and connection pooling.

Managed platforms trade some of that control for less ops work. Supabase gives you managed Postgres plus auth, storage, and realtime subscriptions layered on top, useful if you want those services bundled. Neon gives you managed Postgres with instant database branching, which is genuinely handy for preview environments and testing migrations against production-like data without touching production.

Remember: "Managed" doesn't mean "hands off." You still design your schema, write your migrations, and monitor query performance. Managed just means someone else handles the server.

If you're deciding between the two, our <a href="/blog/supabase-vs-postgres">Supabase vs Postgres</a> and <a href="/blog/neon-vs-supabase">Neon vs Supabase</a> pages walk through the differences.

How FastStaq handles this (Postgres + Prisma)

Full disclosure: I built FastStaq, so take this section as informed rather than neutral.

FastStaq ships with PostgreSQL via Prisma: 76 data models covering auth, billing, workspaces, support, and the rest of the modules out of the box, with migrations included. Because it's just Postgres behind a DATABASE_URL, you're not locked into one host. Point it at a self-hosted instance, or at Supabase's or Neon's managed Postgres, and it works the same way.

If you're new to Prisma, our <a href="/blog/prisma-tutorial">Prisma tutorial</a> walks through the basics before you touch the FastStaq schema.

FAQ

Is PostgreSQL better than MySQL for SaaS? For most SaaS products, yes, mainly due to JSONB support and a broader modern tooling ecosystem. MySQL is still a solid choice if your team already knows it well or you're extending an existing MySQL system.

Can I use MongoDB for a SaaS product? You can, and it's a reasonable fit when most of your data is document-shaped rather than relational. Most SaaS products, though, have a relational core (accounts, billing, permissions) that maps more naturally to Postgres.

Do I need a managed database like Supabase or Neon? Not necessarily, but it removes a category of ops work: backups, patching, and connection management. Early-stage teams often start managed and revisit the decision once traffic or cost justifies self-hosting.

Does FastStaq lock me into a specific database host? No. FastStaq uses Postgres via Prisma and connects through a standard DATABASE_URL, so it works with self-hosted Postgres, Supabase, Neon, or any other Postgres-compatible host.

What database does FastStaq use? FastStaq uses PostgreSQL through Prisma, with 76 data models and migrations included in the source code.

Where to go next

PostgreSQL is the right default for most SaaS products: relational where you need structure, JSONB where you need flexibility, and supported everywhere. MySQL earns its place when your team already runs it. MongoDB earns its place when your core data is genuinely document-shaped. Managed Postgres (Supabase or Neon) trades some control for less server maintenance, which is a fair trade for most early-stage teams.

If you'd rather skip modeling those 76 tables yourself, FastStaq ships Postgres and Prisma pre-wired, alongside auth, billing, and the rest of the modules a SaaS product needs, for $299 one time with lifetime access to the full source.