---
title: "GitHub Actions vs Jenkins: Hosting, Pipelines, Migration"
description: "GitHub Actions vs Jenkins: hosted YAML workflows or a self-managed Jenkinsfile, Marketplace actions or plugins, runners or agents, and how to migrate."
url: https://starsling.dev/compare/jenkins
canonicalUrl: https://starsling.dev/compare/jenkins
---

# GitHub Actions vs Jenkins: where StarSling fits

- [How StarSling works](https://starsling.dev/)

[Comparisons](https://starsling.dev/compare) / GitHub Actions vs Jenkins: where StarSling fits

Last updated: 2026-10-06

StarSling is AI-native CI for GitHub Actions: drop-in Ubuntu runners plus agents that open optimization PRs for your workflows.

GitHub Actions vs Jenkins is a choice between a hosted CI service with YAML workflows and a self-managed automation server with a Jenkinsfile and plugins. Choose the platform first. On GitHub Actions, StarSling changes one line (`runs-on`) to move jobs onto managed runners and adds agents that open pull requests applying [CI optimization best practices](/best-practices/github-actions).

## Table of contents

- [Head to head](#head-to-head)
- [Hosted vs self-managed CI](#hosted-vs-self-managed-ci)
- [YAML workflows vs Jenkinsfile](#yaml-workflows-vs-jenkinsfile)
- [Plugins vs Marketplace actions](#plugins-vs-marketplace-actions)
- [Agent and runner operations](#agent-and-runner-operations)
- [Migrating from Jenkins to GitHub Actions](#migrating-from-jenkins-to-github-actions)
- [Workflow optimization after the move](#workflow-optimization-after-the-move)
- [Best fit](#best-fit)
- [Sources](#sources)
- [References](#references)

<a id="head-to-head"></a>

## Head to head

| Category | StarSling | Jenkins |
|---|---|---|
| Hosting model | GitHub hosts the Actions service and StarSling hosts the runners. Install the StarSling GitHub App and set `runs-on` to `starsling-ubuntu-24.04`. | Self-managed. Jenkins is "a self-contained, open source automation server" you install through native system packages, Docker, or as a standalone application on any machine with a Java Runtime Environment. |
| Pipeline definition | YAML workflow files in `.github/workflows`, triggered by repository events, a schedule, or manually. StarSling runs them unchanged. | A `Jenkinsfile` committed to source control, written in Declarative or Scripted Pipeline syntax. Scripted Pipeline is a general-purpose DSL built with Groovy. |
| Extensions and reuse | Actions referenced with `uses:` from the same repository, any public repository, or a Docker image, browsable in GitHub Marketplace. Reusable workflows share whole jobs. | Plugins installed on the controller from the Update Center, which the Jenkins project operates, with over a thousand to choose from. Shared Libraries load pipeline code from their own repositories. |
| Where jobs run | On StarSling-managed Ubuntu 24.04 runners. GitHub Actions also sends jobs to GitHub-hosted and self-hosted runners, selected by label. | On agents: Java client processes that connect to the controller and run tasks through executors on nodes you provide, statically or through Kubernetes, Amazon EC2, Azure, Google Cloud and other cloud providers. |
| Runner and agent operations | StarSling provisions, scales and replaces the runner machines; you change the `runs-on` label. | You run the controller, its plugins and its agents, install build tools on each node, and size executors per node. Jenkins advises running builds on agents and keeping them off the built-in node. |
| AI optimization PRs | Yes. AI agents analyze logs/telemetry and open optimization PRs. For new accounts, AI-powered optimization PRs are only available to customers on paid plans and are not enabled by default. | Pipeline changes are edits to the `Jenkinsfile`, versioned and reviewed like any other code. |
| Migration path | GitHub publishes a Jenkins migration guide and GitHub Actions Importer, which converts a Jenkins pipeline into a workflow and opens it as a pull request. Then point `runs-on` at StarSling. | Declarative Pipeline is organized into sections and directives (`agent`, `stages`, `steps`, `post`, `environment`, `triggers`, `when`), the units a migration maps one by one. |

<a id="hosted-vs-self-managed-ci"></a>

## Hosted vs self-managed CI

Jenkins is "a self-contained, open source automation server". You install and run it yourself, through native system packages, Docker, or as a standalone application on any machine with a Java Runtime Environment. The controller is the Jenkins service itself: a web server that handles configuration, authorization and authentication, and acts as the "brain" deciding how, when and where to run tasks.

GitHub Actions is part of GitHub. Jobs run on runners: GitHub-hosted runners are virtual machines where "machine maintenance and upgrades are taken care of for you", and self-hosted runners are systems you deploy and manage. StarSling runners join that list as managed runners: install the StarSling GitHub App and set `runs-on` to `starsling-ubuntu-24.04`.

<a id="yaml-workflows-vs-jenkinsfile"></a>

## YAML workflows vs Jenkinsfile

A Jenkins Pipeline is written into a text file called a `Jenkinsfile` and committed to the project's repository, so the pipeline is versioned and reviewed like any other code. A `Jenkinsfile` uses Declarative or Scripted syntax. Declarative Pipeline is designed to make pipeline code easier to write and read; Scripted Pipeline is a general-purpose DSL built with Groovy that runs from the top of the file downwards.

A GitHub Actions workflow is a YAML file in `.github/workflows`. It runs when an event in the repository triggers it, on a schedule, or manually, and each job runs its steps on a runner. GitHub's Jenkins migration guide pairs the two models: Jenkins stages become jobs, and the `agent` directive becomes `runs-on`.

<a id="plugins-vs-marketplace-actions"></a>

## Plugins vs Marketplace actions

Plugins are "the primary means of enhancing the functionality of a Jenkins environment", and the Jenkins docs count over a thousand of them. They are installed on the controller through the Plugin Manager or the Jenkins CLI, downloaded with their dependencies from the Update Center that the Jenkins project operates. Pipeline code shared across projects lives in Shared Libraries, defined in their own source repositories and loaded into existing Pipelines.

In GitHub Actions the reuse unit is an action, referenced with `uses:` from the same repository, any public repository, or a published Docker image, and browsable in GitHub Marketplace from the workflow editor. Actions are Docker container, JavaScript or composite actions, and reusable workflows share whole jobs between workflows. Workflows on StarSling runners use the same actions.

<a id="agent-and-runner-operations"></a>

## Agent and runner operations

Jenkins runs builds on agents: small Java client processes that connect to the controller and run tasks through executors on the nodes you provide. Agents can be statically allocated or provisioned through Kubernetes, OpenShift, Amazon EC2, Azure, Google Cloud and other cloud providers. Build tools are installed on each node, directly or in a container, and each node's executor count sets how many tasks it runs at once. The Jenkins security docs advise running builds on agents and keeping them off the built-in node.

A self-hosted GitHub Actions runner carries the same kind of ownership: you are responsible for updating its operating system and software. GitHub-hosted runners and StarSling runners are managed for you. A job runs on StarSling when its `runs-on` label is `starsling-ubuntu-24.04`, and StarSling's agents read the workflow, logs and telemetry and open pull requests that improve caching, installs and test execution.

<a id="migrating-from-jenkins-to-github-actions"></a>

## Migrating from Jenkins to GitHub Actions

GitHub's Jenkins migration guide maps Declarative Pipeline onto workflow syntax: `agent` to `runs-on`, `stages` to `jobs`, `steps` to `steps`, `environment` to `env`, `triggers` to `on`, Jenkins cron syntax to `on.schedule`, and `when` to `if`. GitHub Actions Importer automates the conversion: a GitHub CLI extension whose `audit`, `forecast`, `dry-run` and `migrate` commands plan the move, preview a workflow, and open it as a pull request.

- Inventory each pipeline's `Jenkinsfile`, plugins, Shared Libraries and the agent labels its stages run on.
- Run `gh actions-importer audit jenkins`, then `dry-run` on a representative pipeline, then `migrate` to open the workflow as a pull request.
- Map each plugin to a Marketplace action or a `run:` step, and each agent label to a `runs-on` label.
- Set `runs-on: starsling-ubuntu-24.04` on Ubuntu jobs to run them on StarSling, and keep the Jenkins job running in parallel until the workflow's checks pass.

<a id="workflow-optimization-after-the-move"></a>

## Workflow optimization after the move

Once the pipeline is a GitHub Actions workflow, StarSling's agents open reviewable pull requests that apply the [GitHub Actions CI best practices](/best-practices/github-actions) to it. Read the public [Mastra optimization PRs and results](/customers/mastra) and the [Better Auth case study](/customers/better-auth) to see those changes on real workflows.

For new accounts, AI-powered optimization PRs are only available to customers on paid plans and are not enabled by default.

<a id="best-fit"></a>

## Best fit

**Choose StarSling if:** Teams on GitHub, or moving to it, who want hosted CI with YAML workflows and Marketplace actions, runners StarSling manages, and agents that keep sending optimization PRs.

**Choose Jenkins if:** Teams that want to run their own automation server, extend it through plugins and Shared Libraries, and place agents on the hardware and clouds they choose.

## FAQ

### Is Jenkins better than GitHub Actions?

Each fits a different setup. Jenkins fits teams that want to run and extend their own automation server, with agents on infrastructure they choose. GitHub Actions fits teams on GitHub that want hosted CI with YAML workflows, Marketplace actions and managed runners. On GitHub Actions, StarSling runs those workflows on its own managed runners.

### Is GitHub Actions hosted or self-hosted?

Both. GitHub hosts the service and offers GitHub-hosted runners, where machine maintenance and upgrades are handled for you, and you can add self-hosted runners that you deploy and manage. StarSling runners are managed runners you select with `runs-on: starsling-ubuntu-24.04`.

### How do I migrate from Jenkins to GitHub Actions?

Start with GitHub's Jenkins migration guide and GitHub Actions Importer, a GitHub CLI extension that audits your Jenkins pipelines, converts one into a workflow and opens it as a pull request. Map plugins to actions and agent labels to `runs-on` labels, then point Ubuntu jobs at `starsling-ubuntu-24.04`.

### What replaces Jenkins plugins in GitHub Actions?

Actions. A workflow step references an action with `uses:`, from GitHub Marketplace, any public repository, or a Docker image. Reusable workflows share whole jobs between workflows, the role Shared Libraries play for Jenkins pipelines.

<a id="sources"></a>

## Sources

- [Jenkins: User documentation](https://www.jenkins.io/doc/), read 2026-10-05
- [Jenkins: Installing Jenkins](https://www.jenkins.io/doc/book/installing/), read 2026-10-05
- [Jenkins: Pipeline](https://www.jenkins.io/doc/book/pipeline/), read 2026-10-05
- [Jenkins: Pipeline syntax](https://www.jenkins.io/doc/book/pipeline/syntax/), read 2026-10-05
- [Jenkins: Managing plugins](https://www.jenkins.io/doc/book/managing/plugins/), read 2026-10-05
- [Jenkins: Shared Libraries](https://www.jenkins.io/doc/book/pipeline/shared-libraries/), read 2026-10-05
- [Jenkins: Managing nodes](https://www.jenkins.io/doc/book/managing/nodes/), read 2026-10-05
- [Jenkins: Controller isolation](https://www.jenkins.io/doc/book/security/controller-isolation/), read 2026-10-05
- [GitHub Docs: GitHub-hosted runners](https://docs.github.com/en/actions/concepts/runners/github-hosted-runners), read 2026-10-05
- [GitHub Docs: Self-hosted runners](https://docs.github.com/en/actions/concepts/runners/self-hosted-runners), read 2026-10-05
- [GitHub Docs: Workflows](https://docs.github.com/en/actions/concepts/workflows-and-actions/workflows), read 2026-10-05
- [GitHub Docs: About custom actions](https://docs.github.com/en/actions/concepts/workflows-and-actions/custom-actions), read 2026-10-05
- [GitHub Docs: Finding and customizing actions](https://docs.github.com/en/actions/how-tos/write-workflows/choose-what-workflows-do/find-and-customize-actions), read 2026-10-05
- [GitHub Docs: Reusable workflows](https://docs.github.com/en/actions/concepts/workflows-and-actions/reusing-workflow-configurations), read 2026-10-05
- [GitHub Docs: Migrating from Jenkins](https://docs.github.com/en/actions/tutorials/migrate-to-github-actions/manual-migrations/migrate-from-jenkins), read 2026-10-05
- [GitHub Docs: GitHub Actions Importer for Jenkins](https://docs.github.com/en/actions/tutorials/migrate-to-github-actions/automated-migrations/jenkins-migration), read 2026-10-05

## Other comparisons

- [StarSling vs GitHub Actions](https://starsling.dev/compare/github-actions)
- [StarSling vs Depot for GitHub Actions](https://starsling.dev/compare/depot)
- [StarSling vs Blacksmith runners for GitHub Actions](https://starsling.dev/compare/blacksmith)
- [StarSling vs WarpBuild](https://starsling.dev/compare/warpbuild)
- [Buildkite vs GitHub Actions: where StarSling fits](https://starsling.dev/compare/buildkite)
- [StarSling vs Namespace runners for GitHub Actions](https://starsling.dev/compare/namespace)
- [StarSling vs RunsOn runners for GitHub Actions](https://starsling.dev/compare/runs-on)
- [StarSling vs Ubicloud runners for GitHub Actions](https://starsling.dev/compare/ubicloud)
- [Compare GitHub Actions runners and CI platforms: StarSling vs GitHub-hosted, Depot, Blacksmith, WarpBuild, Buildkite, and Namespace](https://starsling.dev/compare)

<a id="references"></a>

## References

- [StarSling Runners are now generally available](https://starsling.dev/blog/starsling-runners-are-now-generally-available)
- [Launch YC: StarSling Runners - Self-Driving CI](https://www.ycombinator.com/launches/R7B-starsling-runners-self-driving-ci)
- [StarSling docs](https://docs.starsling.dev)
- [ci-speedup skill source (open source, MIT)](https://github.com/starslingdev/skills)
- [ci-score skill source (open source, MIT)](https://github.com/starslingdev/skills/tree/main/skills/ci-score)
- [ci-secure skill source (open source, MIT)](https://github.com/starslingdev/skills/tree/main/skills/ci-secure)
- [What is AI-native CI?](https://starsling.dev/ai-native-ci)
- [All StarSling comparisons](https://starsling.dev/compare)
- [GitHub Actions alternatives](https://starsling.dev/github-actions-alternatives)
- [GitHub Actions pricing](https://starsling.dev/github-actions-pricing)
- [Self-hosted GitHub Actions runners](https://starsling.dev/self-hosted-github-runners)
- [Benchmark on your own workflows](https://docs.starsling.dev/performance/benchmarks)
- [Migration guide](https://docs.starsling.dev/configuration/migration-guide)
- [Runner label reference](https://docs.starsling.dev/configuration/label-reference)
- [Runner instance types](https://docs.starsling.dev/runners/instance-types)
- [Install the /ci-speedup skill to fix slow GitHub Actions](https://starsling.dev/skills/ci-speedup)
- [Install the /ci-score skill to improve your GitHub Actions setup](https://starsling.dev/skills/ci-score)
- [Install the /ci-secure skill to close critical attack vectors in GitHub Actions](https://starsling.dev/skills/ci-secure)