Method: Official documentation and pricing checked September 28, 2026. No benchmarks were run. Recommendations are based on documented features and billing, not hands-on results.
Choose SQLite for local application data when its write model fits. Choose PostgreSQL when a shared database server and its broader database features fit the application. This is an architecture decision before it is a speed contest.
The central difference
SQLite’s guidance describes a database embedded in the application, using a local file. PostgreSQL is a client/server database. SQLite can still serve a website behind an application server; “embedded” does not mean it is limited to toy programs.
SQLite permits multiple readers but only one writer at a time per database file. Its guidance recommends a client/server engine when many writers cannot take turns or many computers need direct SQL access to shared data. Do not use a raw SQLite file on a network filesystem as an assumed substitute for a database server.
When PostgreSQL fits
PostgreSQL’s official overview documents transactions, MVCC, relational constraints, JSON/JSONB, indexes, extensions and replication. These are reasons to evaluate it when centralized data access or particular database capabilities are requirements. They do not establish a universal throughput advantage.
| Situation | Starting point to evaluate |
|---|---|
| Desktop tool with local data | SQLite |
| App server with modest, serializable writes | SQLite may fit; verify contention and recovery |
| Several services sharing a database | PostgreSQL |
| Required PostgreSQL extension or feature | PostgreSQL |
| Existing production database | Keep it unless a concrete requirement justifies migration |
These are editorial recommendations based on the documented models. A representative workload can reveal a different choice for your application.
Cost is an operating question
PostgreSQL describes its software as free and open source. That is not a free managed hosting plan. Budget compute, storage, backup retention and administration for the deployment you choose. SQLite likewise needs durable storage and an application-level recovery plan; being a file does not make important data disposable.
No cloud price or free-tier limit is asserted here because the topic is the database engines, not a specific hosting contract. Compare a complete deployment rather than attaching an arbitrary monthly price to either engine.
Before choosing or migrating
Test realistic write contention, transaction behavior and queries on a representative dataset. Verify backup restoration. If changing engines, review types, SQL syntax, constraints and application assumptions before importing production data.
Do not migrate just because a benchmark used a different schema or workload. This page supplies no fabricated operations-per-second table, downtime promise or claim that an engine can serve a fixed number of users. Capacity depends on what those users ask the database to do.
Sources, checked September 28, 2026: SQLite appropriate uses, PostgreSQL overview.