Knapsack Pro

GoCD vs Semaphore CI comparison of Continuous Integration servers
What are the differences between GoCD and Semaphore CI?

GoCD

https://www.gocd.org

Semaphore CI

https://semaphoreci.com
Unique feature

Free, open source CI/CD server

Autoscaling made easy / Great CLI

Type of product

On Premise

SaaS

Offers a free plan

Yes

Free, open source software. They provide some Enterprise add-ons and support at a cost though.

Yes

1,300 service minutes every month. Plans to release a free tier for open source projects.

Predictable pricing

Yes

For the Enterprise plans, they specify very clear tiers depending on the number of pipelines (directly correlated with the size of the organization)

Yes

Semaphore doesn't have traditional pricing tiers, instead it lists the types of machines you can use and their pricing per second of service. They plan to release an annual plan at some point.

Support / SLA

Yes

Paid support available for enterprise plans

N/A

Not clear if they offer any real SLA on support.

Paralellism
Every CI servers tends to address this differently (parallel, distributed, build matrix). Some of it is just marketing, and some is just nuance. For this table, parallel means that tasks can be run concurrently on the same machine, distributed means that tasks can be scaled horizontally, on multiple machines
How to split tests in parallel in the optimal way with Knapsack Pro

Yes

Yes

Allows defining a custom build matrix such that your build can be parallelized accross several different environments.

Distributed builds
distributed means that tasks can be scaled horizontally, on multiple machines
How to split tests in parallel in the optimal way with Knapsack Pro

Yes

They specify supporting tools like TLB (http://test-load-balancer.github.io/) which would require distributed builds.

N/A

Containers support / Build environment

Yes

Native Docker and Kubernetes support

Yes

Allows running builds inside docker containers

Analytics / Status overview
Analytics and overview referrs to the ability to, at a glance, see what's breaking (be it a certain task, or the build for a specific project)

Yes

One of the greatest things about GoCD is their Value Stream Map which allows tracing every pipeline through every stage, from code commit, to testing and deployment. They also offer various dashboards for seeing status at a glance.

Yes

Management support
How easy is it to manage users / projects / assign roles and permissions and so on

Yes

Allows managing users, assigning roles, and even defining user groups with specific rights for certain pipelines.

Yes

Self-hosted option

Yes

No

Hosted plans / SaaS

No

Yes

Build pipelines
A continuous delivery pipeline is a description of the process that the software goes through from a new code commit, through testing and other statical analysis steps all the way to the end-users of the product.

Yes

Fairly advanced support, from config files (YML, Groovy, JSON, etc) to API and UI interface for building and managing pipelines.

Yes

Allows defining complex build workflows with ease

Reports
Reports are about the abilty to see specific reports (like code coverage or custom ones), but not necesarily tied in into a larger dashboard.

Yes

N/A

Ecosystem
Besides the official documentation and software, is there a large community using this product? Are there any community-driven tools / plugins that you can use?

Yes

Wide array of plugins available: https://www.gocd.org/plugins/#artifact (although they seem to pride themselves on the fact that most common operations / needs are first class citizens, so no plugins needed)

N/A

Specific language support: Ruby
Some CI servers have built-in support for parsing RSpec or Istanbul output for example and we mention those. Some others make it even easier by detecting Gemfiles or package.json and automate parts of the process for the developer.

Yes

Available via plugins, such as the Gem repository poller: https://www.gocd.org/plugins/#package-repo

Yes

Provides rich documentation on integrating Semaphore CI in Ruby projects. Also provides sudo access if you need to install system dependencies or C extensions.

Specific language support: JavaScript

Yes

Available via plugins, such as the npm repository poller: https://www.gocd.org/plugins/#package-repo

Yes

Provides rich documentation on integrating Semaphore CI in Javascript projects

Integrations
1st party support for common tools (like Slack notifications, various VCS platforms, etc)

Yes

Integrations are also available via plugins (for notifications, LDAP authorization, Elastic agents and more): https://www.gocd.org/plugins/#notification

Yes

Integration with GitHub and Slack. They allow building iOS projects via their macOS Mojave VM image.

API
Custom integreation is available, via an API or otherwise, it's mentioned separately as it allows further customization than any of the Ecosystem/Integration options

Yes

You can build on top of GoCD in a variety of ways, from writing custom plugins to using the CCTray feed provided by it.

No

Auditing

Yes

Yes

Additional notes

List of features is based on Semaphore 2.0

Running Rails tests in parallel on Semaphore CI 2.0 with dynamic test files split

Semaphore CI parallelism integration

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