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Most buyers should pick PostgreSQL.
Choose Elasticsearch when search is a core workload: it provides a RESTful HTTP API for full-text, vector and hybrid search, plus distributed analytics. Choose PostgreSQL when you need an open-source object-relational database with no software charge and the option to self-host. Elasticsearch Cloud Hosted Standard starts at $99 per month, with usage costs tied to RAM-hours, storage and zones. Your choice should follow the workload and the operating costs you can support.
01Side by side
| Elasticsearch | PostgreSQL | |
|---|---|---|
| Pricing model | Hosted Standard starts at $99/month; usage scales | Free software; no paid plans |
| Free tier | No free plan listed | Free of charge |
| Open source and licence | Open source; exact licence not specified | OSI-approved PostgreSQL License |
| Self-hosting | Self-hostable; on-premises deployment available | Self-hostable open-source software |
| API and SDKs | RESTful HTTP API; SDK details not published | API and SDK details not published |
| Integrations | Kibana, Logstash, Beats and Elastic Agent | Homepage lists no specific integrations |
| Deployment model | Cloud, on-premises or serverless | Self-hostable; hosted options unspecified |
| Limits and scaling | Distributed engine; usage scales with RAM, storage, zones | No published seat or usage limits |
Elasticsearch Choose Elasticsearch if
- Choose Elasticsearch if search, vector retrieval or analytics is a primary workload.
- Choose Elasticsearch if you need a RESTful HTTP API for search.
- Choose Elasticsearch if Elastic Stack integrations fit your existing setup.
PostgreSQL Choose PostgreSQL if
- Choose PostgreSQL if you want an open-source object-relational database.
- Choose PostgreSQL if avoiding software charges is a priority.
- Choose PostgreSQL if you want to self-host under its PostgreSQL License.
02Pricing at real usage
PostgreSQL is free of charge, with no paid plans; the PostgreSQL License also permits commercial and noncommercial use. That is a software price, not a quote for the machines or operational work needed to run it. Elasticsearch has no free plan listed. The pricing page lists Elastic Cloud Hosted Standard at $99 per month, including 120 GB of storage and two availability zones. It lists unlimited users, with seat limits not published. The price is a starting point, not a fixed cost at every scale: usage scales by RAM-hours, storage and zones. Annual-billing pricing is not published, while prepaid consumption contracts are available through sales. For a production estimate, model the cluster’s compute, storage and availability-zone requirements rather than multiplying the listed monthly price by users.
03API, SDKs and integration
Elasticsearch stores, indexes and queries data through a RESTful HTTP API. Its search capabilities include full-text, vector and hybrid retrieval, so applications can query search data and build retrieval flows through that interface. Elasticsearch is built on Apache Lucene and works with Kibana, Logstash, Beats and Elastic Agent in the Elastic Stack. PostgreSQL is an open-source object-relational database; its homepage directs developers to official documentation for installing and using it, as well as community resources. It does not list specific integrations. Neither product’s published description names SDKs or supported programming languages, so confirm client-library support for your stack before committing. For PostgreSQL, check the official documentation and community resources for the setup and usage guidance your deployment needs. For Elasticsearch, validate the API operations and integrations required by your application.
04Open source, self-hosting and lock-in
Both products can be self-hosted. Elasticsearch is marked open source, but its exact licence is not specified here; check the licence terms for the version and features you plan to deploy. Its deployment options also include cloud, on-premises and serverless. PostgreSQL is released under the OSI-approved PostgreSQL License, and its project supports self-hosting. The operational trade-off is different: Elasticsearch is a distributed search engine, while PostgreSQL is an object-relational database. Neither project page specifies a data-export format or migration path. Before choosing, verify how to export your data, preserve mappings or schema, and move queries and application code. Those checks matter most if you expect to switch engines later; matching data structures and query behavior may require application changes.
Questions people ask
Is Elasticsearch a replacement for PostgreSQL?
Not by default. Elasticsearch is built for distributed search, full-text and vector retrieval, hybrid search and analytics. PostgreSQL is an open-source object-relational database. Choose based on the workload: search and retrieval favor Elasticsearch, while a general object-relational database points toward PostgreSQL.
Which is cheaper, Elasticsearch or PostgreSQL?
PostgreSQL has no software charge or paid plans. Elastic Cloud Hosted Standard is listed at $99 per month, with usage scaling by RAM-hours, storage and zones. That does not establish total operating cost: self-hosting requires infrastructure and operational work, and the actual cost depends on deployment.
Does Elasticsearch have a free tier?
No free plan is listed for Elasticsearch. The listed Elastic Cloud Hosted Standard price is $99 per month, including 120 GB of storage and two availability zones. PostgreSQL software is free of charge, though hosting and operations are separate costs.
Can you self-host both databases?
Yes. Elasticsearch is self-hostable and can run on-premises; its other deployment options include cloud and serverless. PostgreSQL is also self-hostable. With either choice, account for infrastructure and operational work in addition to any hosted-service charges.