Jenkins vs Semaphore
Which should you use? A side-by-side look at what each one does, who it suits, what it costs, how hard it is to set up, and where each falls short.
Open source · MIT
Open-source automation server for building, testing, and deploying software.
Open source · MIT
Web UI for running Ansible, Terraform/OpenTofu and other DevOps scripts with a team-friendly interface.
The short answer
Choose Jenkins if you need…
- Development teams that want to automate builds and tests
- Teams that need deployment automation with a large plugin ecosystem
- Organizations wanting a free, self-hosted CI/CD server under the MIT license
Choose Semaphore if you need…
- Teams that have outgrown running Ansible or Terraform from a personal terminal
- Operations staff who want scheduled, repeatable deployment runs
- Groups that need access control over who can run deployment tasks
Side-by-side
| Jenkins | Semaphore | |
|---|---|---|
| Type | App | App |
| Price | Free and open source | Free and open source |
| Licence | MIT | MIT |
| GitHub stars | 26.7k | 14.4k |
| Setup difficulty | Intermediate | Intermediate |
| How you get it | Download the app | Run with Docker |
| Main language | Java | Go |
| Last code update | 4 days ago | 4 days ago |
What each one is
Jenkins
Jenkins is an open-source automation server written in Java. It runs repetitive software tasks such as building projects, running tests, static code analysis, and deployment, so teams can catch problems soon after code changes. The README says it offers over 2,000 plugins to extend what it can automate.
Semaphore
Semaphore UI is a web interface for running DevOps tools such as Ansible playbooks, Terraform and OpenTofu code, and Bash or PowerShell scripts. Instead of running these from a terminal, teams can start them from a browser, schedule them, and get notified when tasks fail. It also lets you control who has access to the deployment system.
Best for
Jenkins
- Development teams that want to automate builds and tests
- Teams that need deployment automation with a large plugin ecosystem
- Organizations wanting a free, self-hosted CI/CD server under the MIT license
Semaphore
- Teams that have outgrown running Ansible or Terraform from a personal terminal
- Operations staff who want scheduled, repeatable deployment runs
- Groups that need access control over who can run deployment tasks
Strengths
Jenkins
- Free and open source under the MIT license
- Large plugin library (over 2,000 plugins per the README)
- Offers both a frequent weekly release line and a Long-Term Support line
Semaphore
- Provides a web UI and API over existing DevOps tools
- Supports scheduling and failure notifications
- Includes access control for the deployment system
Not ideal for
Jenkins
- People who want a hosted service with no server to run, since the README describes installing Jenkins yourself
- Non-technical users with no software delivery workflow to automate
Semaphore
- Solo users who are happy with the command line, since the UI adds a server to maintain
- Teams not using Ansible, Terraform/OpenTofu, Terragrunt, Bash or PowerShell, since those are the tools it runs
- Anyone needing a managed service without installing anything, as the README mentions a SaaS option only in a commented-out section
Trade-offs
Jenkins
- The README does not describe setup details, so installation effort is unclear from this document alone
- Running and maintaining a self-hosted server takes ongoing work
Semaphore
- Requires running and maintaining a server, with a choice of install methods the README describes only briefly
- The README is truncated and gives few details on advanced configuration or security setup
- Its main value depends on already using the supported DevOps tools
Getting started
Jenkins
Clone the source repository
git clone https://github.com/jenkinsci/jenkinsSemaphore
Run Semaphore with Docker (SQLite, admin account)
docker run -p 3000:3000 --name semaphore -e SEMAPHORE_DB_DIALECT=sqlite -e SEMAPHORE_ADMIN=admin -e SEMAPHORE_ADMIN_PASSWORD=changeme -e SEMAPHORE_ADMIN_NAME=Admin -e SEMAPHORE_ADMIN_EMAIL=admin@localhost -d semaphoreui/semaphore:latestFrequently asked questions
What is the difference between Jenkins and Semaphore?
Jenkins: Open-source automation server for building, testing, and deploying software. Semaphore: Web UI for running Ansible, Terraform/OpenTofu and other DevOps scripts with a team-friendly interface. Jenkins suits development teams that want to automate builds and tests, while Semaphore suits teams that have outgrown running ansible or terraform from a personal terminal.
Are Jenkins and Semaphore free?
Jenkins: Free and open source. Semaphore: Free and open source.
Is Jenkins or Semaphore more popular?
Jenkins has more GitHub stars (26.7k) than Semaphore (14.4k). Popularity isn't the same as fit — check which one matches your use case above.
Keep comparing
Built from our catalogue entries for both products: open-source details come from each project's README (AI-assisted, refreshed weekly) and GitHub data; AI-tool details are editorial. Spotted something wrong? Let us know from either product's page.