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It's a split decision.
Choose PostgreSQL for an open-source object-relational database you can self-host without software fees or published usage limits. Choose Redis when your application needs caching, streaming, search, vector retrieval, or agent memory—and you want to choose between managed cloud and self-hosted deployments. Redis cloud pricing starts with a 30 MB free tier, then paid plans; PostgreSQL has no paid software plan, but your team supplies hosting and operations. They serve different architectural roles, so using both may fit a stack.
01Side by side
| PostgreSQL | Redis | |
|---|---|---|
| Pricing model | Free software; no paid plans | Cloud plans billed hourly or annually |
| Free tier | Free of charge; no published usage limits | 30 MB; one shared-cloud database |
| Open source and licence | OSI-approved PostgreSQL License | Redis 8 is open source; license unspecified |
| Self-hosting | Self-hostable database | Open source, on-premises, or hybrid deployment |
| CLI and docs | Official docs for installing and using PostgreSQL | Docs and LLM coding-tool entry points |
| Integrations | Homepage lists no specific integrations | Any LLM, agent framework, cloud, or stack |
| Deployment model | Self-hosted; team supplies hosting | Cloud, on-premises, hybrid, or open source |
| Limits and scaling | No published seat or usage limits | Essentials up to 100 GB; Pro unlimited RAM |
PostgreSQL Choose PostgreSQL if
- Choose PostgreSQL if you need an open-source object-relational database.
- Choose PostgreSQL if you want to self-host without software fees.
- Choose PostgreSQL if your team can handle hosting and operations.
Redis Choose Redis if
- Choose Redis if your app needs caching, streaming, or search.
- Choose Redis if agents need vector retrieval, memory, or context.
- Choose Redis if you want managed cloud or hybrid deployment options.
02Pricing at real usage
PostgreSQL is free of charge, with no paid software plans or published seat and usage limits. That does not remove infrastructure costs: teams supply hosting and operational work. The project does not charge by database size or compute in the published pricing facts.
Redis has a 30 MB free cloud tier for one shared database, with a best-effort SLA. Essentials starts at $0.007 per hour, with a $5 monthly total, and covers 250 MB–100 GB of RAM and SSD. Pro starts at $0.014 per hour with a $200 monthly minimum; the page lists the first $200 as free. Pro includes unlimited RAM and multiple databases. The Enterprise option lists on-demand or annual pricing but no price. Redis costs therefore depend on plan and usage; check the current plan terms for the bill at your expected capacity.
03API, SDKs and integration
PostgreSQL is an object-relational database system. Its homepage points developers to official documentation for installing and using it, plus community resources. It does not list specific integrations or language SDKs on the homepage, so confirm supported drivers and client libraries in the project documentation for your chosen language.
Redis presents a broader real-time data platform covering caching, streaming, search, and vector retrieval. Its homepage says it works with any LLM, agent framework, cloud, or existing stack, and directs developers to documentation and LLM coding tools. The homepage does not name particular SDKs, languages, API styles, or protocols; check the Redis docs for the interfaces your application needs. Redis deployment options include hosted cloud and self-managed on-premises or hybrid setups. For either product, verify client-library support, connection behavior, and operational requirements against your application stack before choosing.
04Open source, self-hosting and lock-in
PostgreSQL is open-source software under the OSI-approved PostgreSQL License, and it can be self-hosted. That gives teams control over deployment, but they also take on hosting and operational work. The homepage points to official documentation and community support for learning and installation.
Redis offers Redis 8 as free open-source software and supports self-managed on-premises and hybrid deployments, alongside hosted cloud. Its homepage does not identify the Redis 8 license, so verify the applicable terms before adopting it. Redis says the platform works without vendor lock-in, but that does not specify export formats or migration steps. The vendor does not publish data-export details on the homepage; ask how to export data and preserve application behavior if you need to move between hosted and self-managed deployments.
Questions people ask
Is PostgreSQL end of life?
No. PostgreSQL reports more than 35 years of active development and publishes ongoing releases. Its homepage says PostgreSQL 14 will stop receiving fixes on November 12, 2026, and recommends that users of that version plan an upgrade to a newer supported release.
Can Redis replace PostgreSQL?
They are different kinds of tools. PostgreSQL is an object-relational database system; Redis combines caching, streaming, search, and other real-time data capabilities. Whether Redis can replace a particular database depends on the data model and application features you need.
Can I use PostgreSQL and Redis together?
Yes, as an architectural choice: an application can use PostgreSQL as its object-relational database and Redis for caching or other real-time data tasks. The products' homepages do not prescribe a joint setup, so decide which system owns each data path and how updates stay consistent.
Is PostgreSQL or Redis faster?
There is no universal answer from the products' descriptions. Redis positions its platform for real-time data capabilities, while PostgreSQL describes itself as a database with a reputation for performance. Compare them against your workload, data model, and deployment rather than assuming one is faster overall.