Dimitri Cabete Jorge, Co-Founder & CTO · Last updated: August 2026 · Facts verified: August 2026
TL;DR: Jenkins gives you more CI/CD control than any managed platform, with no license fee at any team size. The costs land elsewhere: a dated interface, plugin upgrades that break working pipelines, and an operational burden that needs a named owner. It fits teams with complex custom pipelines, air-gapped or on-premises requirements, or a large existing Jenkins estate. For a greenfield project, a managed CI platform is the simpler start, and GitHub Actions is the obvious first look.
Ratings: G2: 4.4/5 (573 reviews) · Capterra: 4.5/5 (573 reviews), verified August 2026
What Is Jenkins?
Jenkins is an open-source automation server that builds, tests, and deploys software. It runs on the Java Virtual Machine, and the Jenkins documentation covers installation through native system packages, Docker, or standalone on any machine with a Java Runtime Environment.
The project started around 2004 as Hudson and ships under the MIT License. It can run as a plain CI server or as a continuous delivery hub for an entire release process, and the Jenkins Plugins Index lists 2,000+ community-contributed plugins.
On adoption, the project's own reading of the JetBrains State of Developer Ecosystem Report 2025 puts Jenkins at 28% organizational use, second behind GitHub Actions. The current LTS release is 2.568.2, dated August 5, 2026. Worth checking before an upgrade: the Jenkins changelog records that LTS 2.555.1, released April 15, 2026, requires Java 21 or Java 25 and dropped Java 17.
What Is Jenkins Used For?
Builds, tests, and deployments are the core, and teams push Jenkins well past that into general-purpose automation.
- Continuous integration: Jenkins Pipeline triggers builds and tests on every commit across Git, Subversion, Mercurial, Perforce, and other version control systems.
- Continuous delivery: pipelines pause for a human sign-off and run stages in parallel, which is what carries them from version control through to release.
- Containerized builds: Docker build agents are documented through the Jenkinsfile agent { docker { ... } } block, so each build runs in a clean, isolated environment.
- On-demand Kubernetes agents: the Kubernetes plugin creates a pod per agent and tears it down after the build, so resource use tracks the actual workload.
- Multi-branch automation: multibranch pipelines scan a repository and create pipeline items for every branch and pull request carrying a Jenkinsfile.
- Embedded and hardware test automation: KernelCI uses Jenkins as the backend engine for hardware test runs, a case managed CI platforms rarely cover.
- Large-scale enterprise CI/CD: the documentation covers Android, C/C++, Docker, Java, PHP, Python, and Ruby among others. Avoris Travel runs a Jenkins-based platform used by 200 people across 675 agencies, with plugins cutting build times by more than half.
Key Features of Jenkins
Five parts of Jenkins carry the evaluation: the pipeline model, the distributed build architecture, the plugin catalog, the security layer, and the AI and interface work landing through 2026. The plugin catalog is also what connects it to almost every tool in a DevOps toolchain.
The pipeline model
- Pipeline as Code: a project's whole build, test, and deploy process lives in a Jenkinsfile stored beside the code. Pipelines survive planned and unplanned controller restarts, wait for human approval, and support fork/join, loops, parallel work, custom DSL extensions, and plugin calls.
- Pipeline as YAML: listed as Preview on the public roadmap, which matters for teams weighing Groovy against the YAML model every managed competitor uses.
Distributed builds
- Controller and agents: the controller is the scheduling brain, and agents are small Java client processes that execute work on its behalf. Current documentation uses controller and agent terminology, replacing the older master and slave naming.
- Cloud provisioning: agents can be statically allocated or created on demand through Kubernetes, Amazon EC2, Azure, and Google Cloud.
The plugin catalog
- Install rates tell you what is actually load-bearing: the Matrix Authorization Strategy plugin sits on 91.0% of controllers and the Pipeline plugin on 89.7%, while the Kubernetes plugin is on 13.8%. The first two are effectively part of the product; most of the rest are not.
Security and credentials
- Authentication and authorization are separate: built-in authentication covers Lightweight Directory Access Protocol (LDAP), Jenkins' own user database, and the Unix user and group database, with plugins adding Active Directory, Microsoft Entra ID, and GitHub. The Role-based Authorization Strategy plugin adds global, item, and agent roles with granular permissions, and Cross-Site Request Forgery (CSRF or XSRF) protection is on by default.
- Credentials stay out of pipeline code: encrypted credentials are stored per controller and cover secret text, username and password pairs, SSH private keys, and PKCS#12 certificates. Pipelines reference them by ID only.
AI and the 2026 releases
- AI arrives through plugins, not the core: the Explain Error plugin analyzes build failures through Anthropic Claude, OpenAI, Ollama local models, or AWS Bedrock, and the Resources AI Chatbot plugin adds a conversational assistant in the UI.
- MCP Server, with a patch to check: the MCP Server plugin exposes Jenkins to Model Context Protocol clients. Versions before 0.86.v7d3355e6a had no permission checks (CVE-2025-64132), patched October 29, 2025.
- Interface and framework work: weekly releases through 2026 brought an experimental Manage Jenkins revamp across the Clouds page, Plugin Manager, and Script Console, a redesigned header, Spring Security and Spring Framework 7 in weekly 2.556 on March 24, 2026, and password complexity validation plus deserialization hardening in weekly 2.572 on July 6, 2026.
Jenkins Pros & Cons
The trade is control against upkeep: Jenkins gives you full control over the pipeline, at the cost of running and maintaining all of it yourself.
What Users Say
What users consistently praise:
- Plugin breadth: the catalog is the single most cited strength on every platform. Reviewers describe adapting Jenkins to Docker, Kubernetes, SonarQube, Artifactory, and IBM mainframe systems without leaving the tool.
- Zero licence cost: value for money is Jenkins' highest-scoring dimension anywhere it is measured separately. Reviewers are clear-eyed that the software costs nothing at any team size while infrastructure and maintenance still do.
- Self-hosted control: running on a dedicated server, in containers, or on Kubernetes with no data leaving the organization comes up constantly, and practitioners in compliance-sensitive and defense-adjacent environments treat it as a hard requirement.
- Pipeline as Code maturity: Jenkinsfiles put CI/CD logic under version control beside the application. Practitioners point out that Groovy, being a real programming language, supports syntax highlighting, autocompletion, and shared library abstractions that YAML cannot.
- Long-run reliability: reviewers report multi-year production instances running with little intervention, and instances that scaled from one team to company-wide rebuild load without the controller becoming the bottleneck.
What users consistently complain about:
- Plugin dependency cascades: the most consistent complaint anywhere. Updating one plugin pulls in incompatible versions of its dependents and breaks live pipelines, and a single widely used plugin can take down every instance that installed it.
- Groovy and its error output: advanced pipelines demand Groovy knowledge most teams lack, and the Continuation-Passing Style model throws serialization exceptions that point at internal Hudson classes and leave the failing pipeline code unnamed.
- The dated interface: reviewers call it visibly behind newer CI tools and report a search function that does not work. The unfinished Blue Ocean replacement leaves two interfaces in place, which practitioners read as a structural failure with no end date.
- Administrative burden: Jenkins tends to need a named owner to stay healthy, and plugin security, configuration, and upgrades can absorb a full team member. Where teams each stand up their own instance, the predictable result is a fleet of end-of-life servers with unpatched holes.
Where reviewers diverge:
- The plugin catalog, asset or liability: the same component sits on both sides of the ledger. Buyer platforms score extensibility and integrations as the defining strength; community threads treat abandoned plugins as a standing security risk. Both are describing the catalog accurately.
- Free software against total cost: review platforms lead on zero licence cost, and value for money is the top score. Practitioners emphasize the labour underneath it, and the sharpest version of that complaint is a revenue-critical service depending on a Jenkins install nobody wants to touch. The counter-case exists too: teams with disciplined operations and a short plugin list report the upkeep stays modest.
- Who is doing the rating: most people leaving platform reviews run pipelines on Jenkins; fewer maintain the controller. That is the likeliest reason aggregate scores read better than forum sentiment, and it is worth weighting when the platform score and the community threads seem to describe different products.
Jenkins Pricing
Jenkins itself has no license fee. What a Jenkins deployment costs is infrastructure, plus whoever maintains it, plus commercial support if you buy it.
Rates come from the Jenkins license, the Elestio managed Jenkins page, and the CloudBees pricing page. All pricing information verified August 2026.
Gotchas:
- CloudBees publishes no tiers or figures for CloudBees CI, so any comparison against a per-seat competitor starts with a sales conversation.
- Self-hosting cost is compute, not license. A controller runs on a small cloud instance, priced from the provider's own rate card (AWS on-demand pricing is the usual reference point), and every build agent adds its own instance.
- Compute is the smallest line. Artifact storage, EBS or equivalent volumes per agent, and data transfer out all bill separately, and none of it appears in a per-instance estimate.
- Managed Jenkins hosting is a middle path: Elestio starts at $16 a month with backups, SSL, updates, and monitoring included, billed from hourly credits that do not expire, with disk charged at $0.15 per GB a month.
- The highest cost has no invoice. Plugin patching, JVM upgrades, credential rotation, and flaky-agent triage need a named owner, and the review sentiment above is consistent that this is where the money actually goes.
- Running Jenkins alongside a managed platform, which is common for teams keeping legacy pipelines while new services move, multiplies the maintenance surface without reducing the Jenkins side of it.
Is Jenkins Worth It?
Yes, if your pipelines are complex enough that YAML cannot express them cleanly. Jenkins earns its keep where pipelines fork and join, loop, wait for human approval, or share logic across projects through Groovy shared libraries. It is also the answer when hosted CI is off the table, whether that is an air-gapped network, an on-premises mandate, or a compliance position you have already committed to.
An existing Jenkins estate is its own argument, provided a platform team owns it. The defensive architecture is well established: ephemeral Kubernetes agents, configuration as code, and a short curated plugin list. Build targets outside containers, win32, macOS, BSD, or ARM, are another reason to stay, since those do not migrate cleanly to a managed runner. And once a Jenkins setup is stable, its cost is predictable, which per-minute pricing on hosted CI is not.
Look elsewhere if you are starting fresh and nobody wants to own a controller. GitHub Actions removes the plugin and JVM maintenance entirely, at the cost of tying CI to wherever your code lives. The same applies if you want source control, CI/CD, scanning, and a registry in one application. GitLab CI ships all four together, and assembling the equivalent from Jenkins plugins is work someone on your team will be doing for years.
Jenkins vs GitHub Actions
GitHub Actions is the head-to-head rival, and plenty of organizations run both: Jenkins holding legacy pipelines while new services start on Actions. The real split is who owns the infrastructure.
Where Jenkins wins:
- Pipeline expressiveness: forking and joining, looping, parallel work, human-approval pauses, and custom extensions in a real programming language, none of which YAML replicates without workarounds.
- Multi-VCS support: Jenkins works against GitHub, GitLab, Bitbucket, and Subversion at the same time. GitHub Actions expects the code to live in GitHub, so teams elsewhere build bridges.
- Cost stability: self-hosting means paying for infrastructure you already understand, against per-minute compute charges that scale with build volume.
- Chained and artifact-passing pipelines: where one CI process triggers another and passes artifacts between them, Jenkins handles it natively.
Where GitHub Actions wins:
- No server to maintain: no controller, no plugin upgrades, no JVM patching, no agent fleet.
- Approachability: developers already working in GitHub start producing working pipelines faster, and the YAML model has a far shallower learning curve than Groovy.
- Maintenance reduction: the hours Jenkins absorbs in plugin compatibility and upgrade triage largely disappear, which is the single most common reason teams give for migrating.
- Native features: secrets, artifact storage, and environment isolation ship with the platform.
The honest split, and the one practitioners keep landing on, is that Actions covers standard build, test, and deploy work while Jenkins holds the minority of pipelines with requirements a managed runner cannot express.
Jenkins Alternatives
Teams leave Jenkins for one of two reasons: they don't want to own a controller, or they want one platform instead of assembled pieces.
GitHub Actions: Pick this if your code is already on GitHub and nobody wants the controller on their plate. The GitHub Actions Importer converts Jenkins pipelines, though custom Groovy logic and shared libraries do not come across automatically.
GitLab CI: Pick this if you would rather buy one platform than assemble four. Repository hosting, pipelines, the registry, and scanning all ship together. Practitioners consistently find it easier to debug than Jenkins for equivalent work.
How Jenkins Works With Siit
Siit does not integrate directly with Jenkins. They sit in different layers: Jenkins automates builds and deployments, and Siit is the AI agent layer that handles the employee requests around them.
That distinction matters more than it sounds for platform teams, because the requests Jenkins generates are not Jenkins problems. A new engineer needs credentials, group membership, and access to the tools around the pipeline. Someone needs an agent node, a license, or a permission raised. Those land on IT and platform engineers as interruptions, and none of them are solved inside the CI server.
What Siit can do around a Jenkins environment:
- Identity actions through Okta: password resets, group add and remove, suspend and reactivate, and app assignment, run from a request in Slack or Teams with approval on the sensitive ones.
- Directory context through Microsoft Entra ID: directory sync and group membership. Entra does not reset passwords, so those route through Okta, JumpCloud, or Google Workspace.
- Request handling in chat: access requests, onboarding tasks, and support for DevOps teams arrive where the team already works, with routing and approvals attached automatically.
Siit does not build, deploy, monitor pipelines, or manage Jenkins itself. It handles the request layer around the toolchain, which is a separate job from running the toolchain.
Siit connects with 500+ connectable apps across identity, device management, HR systems, knowledge bases, and ticketing. For a platform team, that is what turns an access request touching three systems into a single thread with the approvals recorded.
