Jenkins review

Jenkins is the free option on this list and still the most extensible. It is a self-contained Java program with packages for Windows, Linux, macOS and other Unix-like systems, configured through a web interface with on-the-fly error checks. More than 2,300 community plugins connect it to practically every tool in the CI/CD toolchain, and builds can be spread across multiple machines to run tests and deployments in parallel. Because the software costs nothing, it scores well on value, and it works in places hosted CI cannot reach, such as air-gapped networks. The real cost is people: someone has to provision the controller and agents, apply security updates, back up configuration and test plugin upgrades. That is why its ease of use score is the lowest here. Teams without that capacity usually spend less overall on a hosted service, even after minute charges.

Who it is for

Teams with the skills to run their own CI server and a need for full control or unusual integrations.

Price

Free and open source; no paid plan.

The leading open source automation server, Jenkins provides hundreds of plugins to support building, deploying and automating any project.
Quoted from the vendor pricing page on November 9, 2026.

Key features

• More than 2,300 community plugins
• Self-contained Java program for Windows, Linux, macOS and other Unix systems
• Web interface for setup with built-in help
• Distributed builds across multiple machines
• Pipelines for building, testing and deploying any project

Strengths and weaknesses

• Strength: No license fees at any scale
• Strength: Plugins cover almost every tool in the CI/CD toolchain
• Strength: Runs anywhere, including air-gapped networks
• Weakness: You host, secure, back up and upgrade the server yourself
• Weakness: Plugin sprawl can make upgrades risky
• Weakness: No vendor support contract from the project

Key facts

• Price: Free, open source
• Plugins: 2,300+
• Hosting: Self-hosted only

Where it ranks

Jenkins is No. 8 in our Best CI/CD Tools verdict.