Power, flexibility, and control

CircleCI gives your team more speed and configurability than ever before.

How CircleCI Works

Automate your pipeline from commit to deploy

VCS integration

CircleCI integrates with GitHub, GitHub Enterprise, and Bitbucket. Every time you commit code, CircleCI creates a build.

Automated testing

CircleCI automatically runs your build in a clean container or virtual machine, allowing you to test every commit.


Your team is notified if a build fails so issues can be fixed quickly.

Automated deployment

Passing builds are deployed to various environments so your product goes to market faster.

Faster performance

The speed and reliability you need when building, testing, and deploying code. Choose the resources you need for optimal performance.

Complete control

Build software your way using custom job orchestration with Workflows.

Unparalleled flexibility

Languages that run on Linux run on CircleCI. First-class Docker support means you can configure your environment how you want.

Everything great teams need

Workflows for job orchestration

Define and orchestrate how job execution (such as build, test, deploy) is run, giving you complete control over your development process across multiple supported configurations. Learn how to schedule jobs with workflows.

First-class Docker support

Run any image from Docker’s public/private registry or other common registries, customizable on a per-job basis. Build Docker images, access Docker layer caching, Compose, and more. Use pre-built CircleCI Docker images.

Choose the CPU/RAM you need

Easily configure your resources (compute/memory) to best fit your team’s needs for specific builds. Learn how to enable configurable resources on your account.

Language-agnostic support

Supports any language that builds on Linux, Windows, or macOS, including C++, Javascript, .NET, PHP, Python, and Ruby. You are free to use any toolchain, framework, or version you want. See language guides and tutorials.

Powerful caching

Speed up your builds with expanded caching options, including images, source code, dependencies, and custom caches. Gain control over cache save and restore points throughout your jobs for optimal performance.

SSH or run local builds for easy debugging

Quickly find and solve problems using SSH access or run jobs in your local environment to ensure faster remediation of issues. Learn how to debug with SSH and with the CircleCI CLI.

Unmatched security

The controls you need to be confident your code is protected: LDAP for user management, audit logging, full-level virtual machine isolation, and more. Read more about our security features.


Our interactive visual dashboard allows you to see all of your builds on CircleCI at a glance. Customize your views from your most failed builds to your slowest tests and more. Learn more about Insights.

Build Environments

No more provisioning headaches

Customize the execution environment to match production—use any Docker image, Linux VM, Windows VM, or macOS VM. Whether you’re building a website, a multi-platform mobile app, or systems software, you’ll get a clean, customizable build environment for every job.

Hosting Options

In the cloud or self-hosted

We can host continuous integration for you on our cloud-managed option or you can run CircleCI behind a firewall on your private infrastructure.


We oversee the setup, security, and maintenance of your continuous integration instance(s).

Instant access to feature releases and automatic upgrades alleviating the need for maintenance.

Authorize with GitHub or Bitbucket and go from sign up to green build in minutes.


Install CircleCI on a private server that your team sets up and maintains for security.

Full System Administrator control for complete customization.

Your team determines the update cadence to fit your maintenance schedule.


Works with your toolchain

CircleCI connects with services you already use like GitHub, Bitbucket, Fastlane, Azure, and Slack.

“The @circleci 2.0 is a huge improvement. Build times have done below 1 minute. Loving it! ”

via @abey_alex

“We successfully migrated both repos and see phenomenal performance improvements, especially when we leverage caching! Our project’s build times went from roughly 2:30 minutes to 1:30 (without cache) and 0:50 (with cache). ”

“Today’s experience on @circleci 2.0: my setup was so fast I had to explicitly wait for elasticsearch to start properly before running tests. ”

via @BlameFrost

“holy moly @circleci down from ~5 mins (version 1.0) to ~2 mins (version 2.0) for testing and deploying. great job! ”

via @zemirco

“Build time dropped from 13 minutes to just over 2 minutes after moving to @circleci 2.0 and enabling caching. Great end to the week! ”

via @qnmco

“Workflows + Docker caching are great with CircleCI 2.0. I’m pumped about what we can do with this! Our Docker build times have gone from ~12 minutes to less than 2 minutes on CircleCI. Fan-freaking-tastic. ”

Josh Dover
Senior Software Engineer at CrateJoy


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