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Seamless multi-primary sync, that
scales fromBig Data toMobile,
with anIntuitive HTTP/JSON API
and designed forReliability.

DOWNLOAD3.5.1 (2025-11-11)

"Amongst all the panic and horror [of a power outage], I was smiling."

- Assaf Morami

"The replication in CouchDB is really the killer feature that sets it apart from other databases."

- Patrick Wolf

"Even if the internet was very bad our databases in the two locations would eventually sync."

- Ryan Meredith

Data Where You Need It

Apache CouchDB ™ lets you access your data where you need it. TheCouch Replication Protocol is implemented in a variety of projects and products that span every imaginable computing environment fromglobally distributed server-clusters, overmobile phones toweb browsers.

Store your datasafely, on your own servers, or with any leading cloud provider. Your web- and native applications love CouchDB, because it speaksJSON natively and supportsbinary data for all your data storage needs.

The Couch Replication Protocol lets your data flow seamlessly between server clusters to mobile phones and web browsers, enabling a compellingoffline-first user-experience while maintaining high performance and strong reliability. CouchDB comes with adeveloper-friendly query language, and optionally MapReduce for simple, efficient, and comprehensive data retrieval.

See theintroduction,technical overview for more information, or learnwhat’s new in 3.4.

Single Node Database

CouchDB is a terrific single-node database that works just like any other database behind an application server of your choice.

Most people start with a single node CouchDB instance. More demanding projects can seamlessly upgrade to a cluster.

Cluster

CouchDB isalso a clustered database that allows you to run a single logical database server on any number of servers or VMs.

A CouchDB cluster improves on the single-node setup with higher capacity and high-availability without changing any APIs.

HTTP/JSON

CouchDB makes use of the ubiquitous HTTP protocol and JSON data format and is compatible with any software that supports them. CouchDB also works great with external tools like HTTP proxy servers, load balancers.

Offline First Data Sync

CouchDB’s uniqueReplication Protocol is the foundation for a whole new generation of“Offline First” applications for Mobile applications and other environments withchallenging network infrastructures.

Ecosystem

CouchDB is built for servers (from a Raspberry Pi to big cloud installations), whilePouchDB is built for mobile & web-browsers.

They can seamlessly replicate data with each other.

Reliability

CouchDB is serious about data reliability.

Individual nodes use a crash-resistant append-only data structure. A multi-node CouchDB cluster saves all data redundantly, so it is always available when you need it.

Want to Contribute?

We welcome your contributions.CouchDB is an open source project. Everything, from this website to the core of the database itself, has been contributed by helpful individuals. The time and attention of our contributors is our most precious resource, and we always need more of it. Our primary goal is to build a welcoming, supporting, inclusive and diverse community. We abide byCode of Conduct and a set ofProject Bylaws. Come join us!

CouchDB Core

Help shape the future of CouchDB! There’s still plenty of work to be done on the core database. We use GitHub to track issues and pull requests.

Fauxton

Lend your JavaScript skills to the next-generation web UI for CouchDB. Fauxton is the “killer app” that makes CouchDB so powerful and easy to manage.

Marketing

We’re not just building a database – we’re crafting the CouchDB story. Help us promote CouchDB: plan meetups, make video tutorials, write blog posts.

Website

Got a few suggestions for the very website you’re reading right now? Think the UX, copy, or layout could be better? Welcome! We’d love to hear from you.

Documentation

Docs can be improved indefinitely. If you’ve got a flair for technical writing, help us make the docs clearer, better structured, or even translate them.