We may earn a commission if you buy through links on this page. It never changes a score or a ranking. How we make money
PostgreSQL is an open-source database server you can run yourself, but your team supplies the hosting and operational work. The right replacement depends on what you want to change: MongoDB targets document-shaped data, ClickHouse and DuckDB focus on analytics, and Elasticsearch is built for search workloads. MySQL and Firebird offer other self-hosted SQL options. Neon is a different case: it is managed Postgres, so it changes the hosting model, not the database engine.
01Why people leave PostgreSQL
You need document-shaped data
Some developers prefer MongoDB’s document model and query API. Reddit commenters also point out that PostgreSQL can handle JSON, so compare the data model before migrating.
Your workload needs another scaling model
One Reddit commenter describes using MongoDB Atlas clusters for high-throughput workloads and moving noisy collections between clusters; that is one team’s experience, not a general benchmark.
You want less database operations work
With self-hosted PostgreSQL, your team supplies hosting and operations. A managed database service can shift some of that work, though it changes deployment choices and costs.
02The alternatives, ranked by fit
- Document applications
MongoDBMongoDBChoose MongoDB when your application is built around document-shaped data and you want its document query API instead of a relational data layer. It is self-hostable, and the listed price starts at $8 with a free plan. Moving from PostgreSQL means adapting data access and deciding how to keep flexible schemas coherent.
Trade-off: Document flexibility needs deliberate schema design; this is not a like-for-like SQL migration.
7.2/10from
$8/mofree plan - Existing MySQL apps
MySQLMySQLMySQL fits applications already built for MySQL and teams that want a self-hostable database with a GPL option. The listed pricing starts at $178.33 and includes a free plan; production cost depends on edition and server size. It is a more relevant comparison when MySQL compatibility, rather than a new data model, is the goal.
Trade-off: Check the edition and server-size costs before treating the free plan as a production budget.
7.3/10from
$178.33/mofree plan - Real-time analytics
ClickHouseClickHouseClickHouse is a better fit when the workload is fast analytical SQL over large datasets, rather than a general relational data layer. It is open source and self-hostable, so teams can operate it themselves. The listed starting price is n/a; assess hosting and operations costs against the analytics workload before choosing it.
Trade-off: A columnar analytics database is not a general-purpose PostgreSQL replacement.
8.3/10from
Custom - Local SQL analytics
DuckDBDuckDBDuckDB suits local data work, embedded analytical queries, and SQL directly over Parquet and CSV. It is open source, self-hostable, and has a free plan. Choose it to replace PostgreSQL for an analytics task that fits an in-process database, not as a default move for an application’s shared relational data.
Trade-off: Its listed strengths are local and embedded analytics, not a shared application database.
8.5/10from
Freefree plan - Self-hosted SQL
FirebirdFirebirdFirebird is an option for teams that want a self-hosted SQL database and documented developer drivers. It is open source, and a free database option is listed. The listed starting price is $575 with a free plan, so confirm which offering that price applies to before comparing production costs.
Trade-off: Check driver support and the applicable paid offering for your application.
7.2/10from
$575/mofree plan - Search and retrieval
ElasticsearchElasticsearchElasticsearch fits search across large datasets and AI applications needing hybrid retrieval. It is listed as open source and self-hostable, with pricing starting at $99. Consider it when search is the workload you need to replace; it is not a direct relational database substitute, so plan for a different data and query model.
Trade-off: It targets search, and the listing flags cluster operations and scaling complexity.
7.5/10from
$99/mo - Managed Postgres
NeonNeonNeon is for teams whose main reason to leave PostgreSQL is managing the database themselves. It offers managed Postgres with branching and isolated preview databases; pricing starts at $15 with a free plan, and paid bills depend on usage. This changes the hosting model, not the database engine, so it is not a fit if you need to leave Postgres.
Trade-off: You keep PostgreSQL and take on a managed service’s pricing and deployment choices.
7.6/10from
$15/mofree plan
03Side by side
| Tool | Score | From | Free plan | Best for |
|---|---|---|---|---|
 PostgreSQL PostgreSQL (current) | 8.4 | Free | Yes | Teams that want open-source database software |
| MongoDB MongoDB | 7.2 | $8/mo | Yes | Apps built around document-shaped data |
| MySQL MySQL | 7.3 | $178.33/mo | Yes | Applications already built on MySQL |
| ClickHouse ClickHouse | 8.3 | Custom | No | Real-time analytics on large datasets |
| DuckDB DuckDB | 8.5 | Free | Yes | Local SQL analytics and data wrangling |
| Firebird Firebird | 7.2 | $575/mo | Yes | Teams needing a self-hosted SQL database |
| Elasticsearch Elasticsearch | 7.5 | $99/mo | No | AI apps needing hybrid retrieval |
| Neon Neon | 7.6 | $15/mo | Yes | Apps needing managed Postgres |
Questions people ask
Which PostgreSQL alternative is best for document data?
MongoDB is the clearest fit among these options for applications built around document-shaped data. Its listed starting price is $8 with a free plan, and it can be self-hosted. Before migrating, decide how the application will manage schema changes and confirm that its document query API suits your codebase.
Which PostgreSQL alternative is cheapest?
There is no useful price comparison without a workload and deployment model. DuckDB has a free plan for local and embedded analytics, while Firebird lists a free database option. MongoDB, MySQL, Elasticsearch and Neon also list free plans, but their paid starting prices do not establish what production will cost.
Can I move away from PostgreSQL without changing databases?
If your main goal is to reduce database operations work, Neon offers managed Postgres with branching and isolated preview databases. It keeps PostgreSQL as the engine, so it is a hosting change rather than a database migration. If you need a different engine, choose an alternative based on your data model and workload.