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Databases · head to head

CouchDB vs PostgreSQL

CouchDB logo

CouchDB

Databases

Seamless multi-master sync with Apache CouchDB

From
Free
Rated
-
Full reviewWebsite
PostgreSQL logo

PostgreSQL

Databases

The world's most advanced open source relational database

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: CouchDB append-only storage model may have performance implications for certain workloads with high update rates; PostgreSQL requires manual scaling across multiple machines for very large deployments
  • They diverge on capability: CouchDB covers Multi-master Replication, PostgreSQL covers ACID Compliance.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which CouchDB and PostgreSQL actually diverge.

Attributes where CouchDB and PostgreSQL differ
AttributeCouchDBPostgreSQL
Pricing modelopen-sourceUnknown
PlatformsDocker, Windows (x64), macOS, Linux (Debian, Ubuntu, RHEL, CentOS), Raspberry PiLinux, Windows, macOS, BSD, Unix
Founded19991996

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Databases).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in CouchDB

  • Multi-master Replication
  • HTTP/JSON API
  • MapReduce Views
  • ACID Semantics
  • Offline-first
  • Conflict Resolution
  • Fauxton UI
  • PouchDB

Only in PostgreSQL

  • ACID Compliance
  • JSON/JSONB Support
  • Full-text Search
  • Extensibility
  • Advanced Indexing
  • Partitioning
  • Replication
  • pgAdmin

Both cover

  • Linux support
  • Windows support
  • Mac support
  • Docker support

What people use each for

The jobs each tool is most often brought in to do.

CouchDB

  • Offline-first applications requiring seamless replication across mobile and server environmentsnot PostgreSQL
  • Multi-master deployments where data consistency eventually resolves across regionsnot PostgreSQL
  • IoT and edge computing scenarios with intermittent connectivitynot PostgreSQL

PostgreSQL

  • Transaction processingnot CouchDB
  • Data storagenot CouchDB
  • Application backendnot CouchDB
  • Reportingnot CouchDB
  • Data analyticsnot CouchDB

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

CouchDB

  • Append-only storage model may have performance implications for certain workloads with high update rates
  • Requires network synchronisation for cluster data consistency; can introduce latency in multi-master scenarios
  • No explicit support for complex joins; MapReduce queries may be inefficient compared to relational databases

PostgreSQL

  • Requires manual scaling across multiple machines for very large deployments
  • Performance tuning requires deep knowledge of database internals
  • No built-in graphical admin interface; command-line tools are primary method

Pricing, plan by plan

CouchDB

Free

No published plan breakdown. See the CouchDB review.

PostgreSQL

Free

No published plan breakdown. See the PostgreSQL review.

Which should you pick?

Choose CouchDB if

  • You need multi-master replication.
  • You want to start without paying.
  • You work on Docker, Windows (x64), macOS, Linux (Debian, Ubuntu, RHEL, CentOS), Raspberry Pi.
  • You also want http/json api.
CouchDB review

Choose PostgreSQL if

  • You need acid compliance.
  • You want to start without paying.
  • You work on Linux, Windows, macOS, BSD, Unix.
  • You also want json/jsonb support.
PostgreSQL review

Questions people ask

Is CouchDB or PostgreSQL better?
Neither clearly leads. CouchDB starts at Free and PostgreSQL at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, CouchDB or PostgreSQL?
CouchDB starts at Free and PostgreSQL at Free.
Does CouchDB or PostgreSQL run on more platforms?
CouchDB runs on Docker, Windows (x64), macOS, Linux (Debian, Ubuntu, RHEL, CentOS), Raspberry Pi. PostgreSQL runs on Linux, Windows, macOS, BSD, Unix.
Can I use CouchDB for free?
Both have a free tier, so you can try either at no cost before committing.
What is CouchDB best used for?
CouchDB is most often used for offline-first applications requiring seamless replication across mobile and server environments, multi-master deployments where data consistency eventually resolves across regions, iot and edge computing scenarios with intermittent connectivity. Of those, offline-first applications requiring seamless replication across mobile and server environments and multi-master deployments where data consistency eventually resolves across regions are not what PostgreSQL is typically brought in for.
What can CouchDB do that PostgreSQL cannot?
CouchDB covers Multi-master Replication, HTTP/JSON API, MapReduce Views, ACID Semantics. PostgreSQL covers ACID Compliance, JSON/JSONB Support, Full-text Search, Extensibility. Both handle Linux support, Windows support, Mac support, Docker support.

Answered from the vendors’ own pages

CouchDB: Is Apache CouchDB free to use?

Yes, Apache CouchDB is completely free to download and use. It is open source software licensed under the Apache License 2.0.

Source
PostgreSQL: Is PostgreSQL completely free?

Yes. PostgreSQL is completely free and open source with no licensing fees or restrictions on use.

Source
CouchDB: Can I use CouchDB for commercial purposes?

Yes, the Apache License 2.0 permits commercial use. The license is permissive and does not restrict business applications.

Source
PostgreSQL: What platforms does PostgreSQL run on?

PostgreSQL runs on all major operating systems including Linux, Windows, macOS, BSD, and commercial Unix variants, and has been proven highly scalable managing terabytes to petabytes of data.

Source
CouchDB: Is there a paid support or professional services option?

CouchDB's homepage mentions Professional Services as an available option, but no pricing details or specific service costs are listed. Contact the Apache CouchDB project for more information.

Source
PostgreSQL: What procedural languages are supported?

PostgreSQL supports stored functions and procedures in multiple languages including PL/pgSQL, Perl, Python, Tcl, Java, JavaScript, R, and Rust.

Source
CouchDB: Who handles hosting costs if I use CouchDB?

CouchDB is self-hosted, so you are responsible for your own infrastructure and hosting costs. The software itself is free.

Source
PostgreSQL: What is ACID compliance in PostgreSQL?

PostgreSQL has been ACID-compliant since 2001, ensuring data integrity through atomicity, consistency, isolation, and durability guarantees for all transactions.

Source
PostgreSQL: Does PostgreSQL support JSON data?

Yes. PostgreSQL supports JSON and JSONB data types for storing and querying JSON documents, along with XML and other document formats.

Source
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