Concurrent Versions System

Free plan LinuxSelf-hostedWindows

Visit Concurrent Versions System Alternatives Pricing

What Concurrent Versions System is

Concurrent Versions System (CVS) is a version control system for preserving the history of source files and documents. It stores versions as differences in one file to reduce storage use. In team workflows, developers work in separate directories and CVS merges their work. Its centralized client/server model keeps the version history on a central server and provides clients with working copies. A network connection is needed for checkins and updates, though editing and manipulating local versions can happen offline. CVS supports branching, merging, sparse checkout, file locking, and user-supplied scripts for logging operations or enforcing site-specific policies. It is free and self-hosted, with Windows, Unix, and Linux listed among its platforms. The manual describes remote access using SSH, password authentication, GSSAPI, and Kerberos. It cautions that pserver passwords are trivially encoded and transmitted in that encoding. CVS does not provide automated testing or a built-in process model, and a concurrent update may receive only some changes from another multi-file commit. The manual lists mailing lists for discussion and bug reports.

Who it suits

CVS may suit developers who need centralized version history and can manage a self-hosted workflow. Its documented branching, merging, and scripting capabilities may be useful for teams working with source files or documents.

What it does well

Free and self-hosted.
Supports branching, merging, and sparse checkout.
Local file editing can continue without a network.
User scripts can log operations or enforce policies.

What to know first

Checkins and updates require a network connection.
No automated testing program is included.
No built-in process model is provided.
Concurrent updates may receive only some multi-file changes.

Limits

The free CVS plan is listed as free, with no hosted plan or usage limits stated. CVS does not provide an automated testing program or built in process model, and a concurrent update can receive only some changes from another multi file commit.

Plans

Plan	Billed and limits	Price
CVS	No hosted plan or usage limits stated	Free

As cvs.nongnu.org lists them, read 7 Oct 2026. The maker's own page has the final word.

Getting started

Visit the CVS website.
Choose a self hosted setup for Linux, Windows, or Unix.
Set up a central repository and client working copies.
Select a documented remote access method such as SSH, GSSAPI, or Kerberos.
Work in separate directories, and use a network connection for checkins and updates.

Verdict

CVS provides centralized version control with branching, merging, and self-hosting. Its limitations around multi-file concurrent updates, testing, and process modeling are important considerations for teams.

Questions

How much does CVS cost?

The CVS plan is free. The pricing details state no hosted plan or usage limits.

Can CVS be self hosted?

Yes. Self hosted deployment is listed, and CVS uses a centralized repository model.

Which platforms are listed?

Linux, Windows, and Unix are listed. The platform details also identify CVS as self hosted.

Does CVS support branching and merging?

Yes. The manual documents branching and merging as CVS capabilities.

How does CVS handle remote access?

The manual describes SSH, password authentication, GSSAPI, and Kerberos. It cautions that pserver passwords are trivially encoded and sent in that same encoding.

Does CVS include automated testing?

No. CVS does not provide an automated testing program or a built in process model.

Facts from Concurrent Versions System's own pages

Authentication: The manual describes remote access methods including SSH, password authentication, GSSAPI, and Kerberos. · gnu.org, 7 Oct 2026
Branching and merging: The manual documents branching and merging as CVS capabilities. · gnu.org, 7 Oct 2026
Central repository: Client/server CVS keeps version history on a central server and gives client machines copies of the files developers are working on. · cvs.nongnu.org, 7 Oct 2026
Concurrency limitation: A concurrent update can receive only some of the changes from another multi-file commit. · gnu.org, 7 Oct 2026
Download: The GNU FTP archive lists CVS source archives, including version 1.12.13a. · ftp.gnu.org, 7 Oct 2026
Founded: 1986 · cvs.nongnu.org, 28 Sept 2026
History storage: CVS stores file versions as differences in a single file to reduce storage use. · gnu.org, 7 Oct 2026
Network requirement: The network connection must be available for operations such as checkins and updates, but not for editing or manipulating local file versions. · cvs.nongnu.org, 7 Oct 2026
Notable limitation: CVS does not provide an automated testing program or a built-in process model. · gnu.org, 7 Oct 2026
Policy scripts: CVS can run user-supplied scripts to log operations or enforce site-specific policies. · cvs.nongnu.org, 7 Oct 2026
Purpose: CVS is a version control system for recording the history of source files and documents. · gnu.org, 7 Oct 2026
Security: The manual warns that pserver passwords are trivially encoded and transmitted in the same encoding, which does not prevent an attacker from obtaining them. · gnu.org, 7 Oct 2026
Support: The manual lists the info-cvs mailing list for general CVS discussion and bug-cvs for bug reports. · gnu.org, 7 Oct 2026
Team workflow: Each developer works in a separate directory, and CVS merges work when developers are done. · gnu.org, 7 Oct 2026