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Pick up to 4 ci/cd and we'll lay out their specifications side by side. Apples to apples only — once you pick the first item, the picker locks to its category so you don't end up comparing Selenium with OWASP Top 10.

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Jenkins ×
CircleCI ×
Locked to CI/CDstart over to switch.
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Jenkins

Jenkins Project

Open Source Free Tier Self-Hosted

Most-deployed open-source automation server.

Visit website ↗
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CircleCI

CircleCI

Commercial Free Tier Cloud / SaaS

Cloud-native CI/CD with strong parallelisation.

Visit website ↗
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Specification comparison

Schema: Tools. Missing values are marked "Not available yet" — those are next on our research list.

Rating key: Positive / Free / Fast Limited / Moderate Difficult / Steep Informational
Attribute
Jenkins
Jenkins Project
×
CircleCI
CircleCI
×
Pricing Free Free
(6,000 credits/mo); Performance from $15/mo
Free tier / OSS 100%
open source
Yes
— 6,000 free credits/month
License MIT Commercial
(SaaS) / Server (on-prem)
Testing type CI/CD CI/CD
Languages / SDKs Groovy (Pipeline DSL), shell YAML pipeline definition
Supported platforms Self-hosted on any OS / Docker / Kubernetes SaaS, self-hosted (CircleCI Server)
Parallel testing Yes
— parallel pipeline stages & agents
Yes
— test splitting & parallelism
Speed Moderate
— depends on agent configuration
Very fast
— optimised resource classes
Key integrations 1800+ plugins across the toolchain GitHub, Bitbucket, Slack, Jira, AWS, GCP, Azure
Learning curve Moderate Easy
Community / Support Massive,
longest-running CI/CD project
Large;
active developer community
Maintained by Jenkins community / CD Foundation CircleCI
First released 2011 (forked from Hudson, 2005) 2011
Latest version See website See website
Best suited for Teams needing total control & on-prem CI/CD Cloud-first teams needing fast, scalable CI/CD
Official site www.jenkins.io ↗ circleci.com ↗

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