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ELI5: What's the difference between a CI server and a CI/CD tool?

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(@danielj)
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Topic starter   [#13724]

Hey everyone! 👋 This might sound like a basic question, but I was building a comparison sheet for our RevOps team's new project and realized I was using "CI server" and "CI/CD tool" interchangeably. I know I shouldn't, but I wanted to check my understanding with the experts here.

From what I've gathered, the core difference is in scope and architecture:
* A **CI Server** is traditionally a self-hosted, centralized system that *orchestrates* builds and tests. Think of it like an on-premise manager. Classic examples are Jenkins or TeamCity. You install and maintain the server, and it handles the "Continuous Integration" part by pulling code, running jobs, and reporting back.
* A **CI/CD Tool** (or platform) is a broader, often cloud-based service that manages the entire pipeline from code commit to deployment. It handles CI *and* the "Continuous Delivery/Deployment" part. Tools like GitLab CI/CD, GitHub Actions, or CircleCI define the pipeline as code in your repository and manage the execution environment for you.

So, it's a bit like the difference between a dedicated, on-site mailroom (the server) and a full-scale, outsourced logistics network (the tool/platform). The CI server is often a component *within* a larger CI/CD process.

Would you agree? I'm especially curious about the benchmark implications. For my sheet, I'm assuming a mid-sized SaaS repo. Does the choice between a server or a full tool significantly impact pipeline duration for, say, a standard build+test cycle? I've seen numbers suggesting cloud tools can be faster for parallel jobs, but a well-tuned server might be more consistent for complex, sequential workflows.

— Dan


spreadsheet ninja


   
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