CircleCI vs Jenkins: Choosing The Right CI/CD Tool

CircleCI vs Jenkins: Choosing The Right CI/CD Tool
Written by Debarghya DasOctober 27, 2021
16 min read
Debarghya Das

Junior Front-End Developer

With so many CI/CD tools with amazing features available, between CircleCI and Jenkins you're bound to get confused! Find out what's the right fit for you.

About CircleCI


What is CircleCI?

CircleCI is primarily a cloud-based CI orchestration tool. There is also an Enterprise version which can be setup on one’s own infrastructure. It was founded in 2011 and is based out of San Francisco. This tool helps in automating installation and delivery processes. It is quite simple to configure and maintain.

CircleCI reduces the overhead of having a dedicated server as it is cloud-based. The enterprise version is also low on maintenance. The cloud-based platform offers credit-based plans that are scalable and help in deploying applications faster.

Features of CircleCI

  • Serves around 30000 clients and is capable of running a million tasks per day.
  • Offers performance-based scaling options.
  • Incorporates SSH into the build and test runs to debug.
  • Enables setting up of parallel builds for faster execution of the process.
  • Runs every task as a new container which prevents stale build data causing issues.
  • Announces the end of task execution via Email Notification.
  • Offers numerous orbs (plugins) that help in connecting the existing tools setup.
  • Offers cached third-party configurations and application specifications instead of system deployment.

About Jenkins


What is Jenkins?

Jenkins is an open-source automation tool. Initially developed by Hudson, Jenkins later was separated into a new tool and was made open source. It’s extensive community support and contribution has made it the most popular of open-source CI-CD tools. This has also led to the development of over 1500 plugins for various integrations with other tools. Through the years, Jenkins has gained wide popularity in the DevOps community due to its versatility and huge community support.

Features of Jenkins :

  • With the enormous number of plugins, it can be set up as a simple CI server and also handle CD for complex projects.
  • Can be used to connect multiple slave nodes which helps in distributing the workload across platforms.
  • Almost any tool can be integrated into Jenkins owing to the enormous number of plugins available in its update center. Most companies who develop tools themselves also release a plugin for Jenkins.
  • Owing to its highly distributed nature and huge plugin support, there are a lot of possibilities for what Jenkins can do.
  • Ready packages for all OS flavors available on the download center. Java is the only prerequisite it requires.
  • Has a very neat and interactive UI which makes configuring projects easy. There is built-in help for most configurations.

Then we will know about Continuous Integration(CI) & Continuous Delivery(CD)


So, What Is Continuous Integration?

Continuous integration is a development approach where programmers merge their code into a shared repository, which is further verified by automated test and build sequences.

Continuous Integration simplifies integration into a quick, easy-to-repeat production process and ensures that any errors in the process are identified at an early stage. This approach leads to a significant reduction of integration issues and helps teams to release their software rapidly.

Continuous integration focuses on test data and automatic system deployment to smoothen the integration process. Switching to CI can be a big transition for your developers but certain tools will help you get the work done faster.

What Is Continuous Delivery (CD)? 

Continuous delivery is a software development process wherein the development phase is more streamlined to allow fast and efficient deliveries to production. A successful continuous delivery method requires ensuring that it can always be in a state where it can be immediately deployed. For CD, app delivery is a regular process with no sentiment of immediacy.

What’s important about the CD is it will deploy the same resource in all settings. As a consequence, a built-in CI occurs just for once but not for every setting. The created resource should function with placeholders or data structures for a build-on design.

In next, we will know the differences between CircleCI vs Jenkins

Circle CI:

Build Configuration

  • Builds are configured using the circle.yaml file
  • This config will be like any other repo and can be called using CircleCI
  • Helps in version control of the configurations and makes sharing of build configs easy

Setup and Maintenance

  • No initial setup required as it is primarily cloud-based. Enterprise version is also easy to set up
  • Out-of-the-box solutions available to maintain third-party integrations
  • New features will be available to the users as soon as they are released in the cloud version

Build Environment

  • Every job will be run in a new container where all the dependencies will be installed by CircleCI

User Interface

  • Has an interactive UI and undergoes frequent upgrades 

Plugin Support

  • Offers a decent number of Orbs – plugins that help integrate with various tools
  • Orbs are structured in a standard way and have common best practices making it easy for the users


  • Offers scalable systems to accommodate large build processes and running jobs in parallel
  • Cache dependencies, Docker layers help in speeding up the builds


  • Comes with an in-built feature to enable parallelism. This is achieved by running multiple containers at once


  • Users can be added via VCS Authentication
  • Permissions can be automatically adopted from VCS


  • Application level security coupled with runtime isolation using containers provides a secure build environment
  • SOC II and FedRAMP certified

Docker Workflow

  • Built-in support for Docker in Workflow can be accessed by adding services section in circle.yaml


  • Features like SSH and automated DevOps testing features make it easier to debug


Build Configuration

  • Builds are configured through the Jenkins web interface or the Jenkins pipeline-as-a-code groovy syntax
  • Settings are stored in the Jenkins file system on the Jenkins master node
  • Build configurations cannot be easily shared as there is no version control integration for storing the config files

Setup and Maintenance

  • Initial setup can be done using the packages available for respective OSes
  • Initial setup is easy but the configuration becomes a bit tedious
  • Maintenance requires a dedicated resource to check compatibility of Jenkins and the plugins installed as jenkins and plugin developments do not happen in sync. Plugins are interdependent causing a huge dependency chain

Build Environment

  • The teams need to maintain the sanity of the build environment as jobs are run on the same server.  Maintaining dependencies also becomes a tedious task

User Interface

  • Is heavy and clumsy. It is comparatively slower and has more of a legacy UI

Plugin Support .

  • Offers a plethora of plugins integrating almost all tools used as a part of the SDLC
  • Plugins are developed by companies and various community contributors
  • They do not have a common structure and thus become difficult for the users


  • Build nodes need to be scaled in order to scale up Jenkins for faster executions
  • Execution speed depends on the efficiency of the plugins


  • Builds jobs can be run in parallel using multi-threading


  • Offers matrix-based and role-based permissions.
  • Permissions need to be set up manually and cannot be imported from other security systems. As an alternative, many teams place Jenkins behind their AD or Oauth systems


  • Only a single layer of security surrounding the CI fleet
  • Additional security can be manually set up
  • Various levels of security for OSS plugins

Docker Workflow

  • No built-in support for Docker. Plugins can be installed and Docker support can be enabled in the build environment


  • Debugging needs manual DevOps testing and integrated team support

Which tool to use? CircleCI or Jenkins?

In conclusion, the key difference between CircleCI vs Jenkins is that Jenkins is more secure and elaborates; CircleCI is lightweight and open.

CircleCI does not have the overhead of initial setup and maintenance. This makes it a go-to choice when the implementation needs to get going in a short span. Additionally, when a company does not have a dedicated resource to maintain the CI environment, the cloud-based platform of CircleCI helps. Parallel execution of builds is another case for which CircleCI can be considered.

Jenkins is an open-source tool. When a company can afford to allocate dedicated servers and manpower to setup and maintain Jenkins, it would surely be the go-to choice. When the workflow has multiple tool integrations, source control other than bitbucket and Github, and when the build uses some highly confidential data which cannot be run over a cloud-provided CI setup, in-house setup of Jenkins can be used.

No matter which CI/CD server is chosen, testing the application’s cross-platform compatibility on real browsers and devices is mandatory. It is the only way to guarantee that the software delivers seamless and consistent UX irrespective of the device and browser used to access them.

Emulators and simulators simply do not offer the real user conditions that software must run within, making the results of any tests run on them inaccurate. Consider testing websites and apps on a real device cloud, preferably one that offers the latest devices, browsers, and OS versions. This applies to both manual and automated testing.

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Debarghya Das
Junior Front-End Developer
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