Do I need PostgreSQL if my app only stores a few tables?

Not necessarily.

If your app only needs to store a few tables, PostgreSQL may still be a great choice, but it’s not required just because the data model is small.

When PostgreSQL is a good fit

Use PostgreSQL if you want:

• Reliable relational data with foreign keys and constraints
• Strong querying and reporting support
• Future growth without changing databases later
• Transactions and data integrity
• Easy scaling from “small app” to “real product”

Even for a few tables, Postgres is often the safest default.

When you might not need it

You could skip PostgreSQL if:

• Your app is very simple
• You only need key-value or document-style storage
• You want the lightest possible setup
• You’re fine with an embedded DB like SQLite

Common alternative: SQLite

For a small app, SQLite is often enough:

• No separate database server
• Very simple deployment
• Great for prototypes, small internal tools, and low-traffic apps

Rule of thumb

• Prototype / small app / single-user tool → SQLite is often enough
• Multi-user app / need strong relational guarantees / expect growth → PostgreSQL

If you want, I can help you choose between PostgreSQL, SQLite, and something like MongoDB based on your app’s requirements.