Heroku CI pros & cons, features, benefits of Continuous Integration server

	Heroku CI https://www.heroku.com/continuous-integration
Unique feature	Heroku Flow
Type of product	SaaS
Offers a free plan	No (partial) For CI only, the cost starts at $10 for pipeline, plus a variable amount depending on how long the build runs for (prorated per second). The servers used for CI cost $250 for a full month, which means you get about 3 hours for $1. For hosting, there's a free tier, limited to 1 web/1 worker with 512 MB RAM. One of the more annoying limitations is that free dynos are put into sleep mode after 30 min. of inactivity, which increases loading times considerably.
Predictable pricing	Yes Clearly defined, offers a calculator.
Support / SLA	Yes
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 Up to 16 nodes. You can ask Heroku support to enable up to 32 parallel dynos.
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	N/A
Containers support / Build environment	Yes Builds run in isolation on new dynos (Heroku containers). Wide support via buildpacks: https://devcenter.heroku.com/articles/buildpacks
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 Great visual overview built-in.
Management support How easy is it to manage users / projects / assign roles and permissions and so on	Yes One of the more mature solutions for teams on the market, Heroku Teams is available for free for 1-5 people, and comes at a cost for 6+ team members: https://www.heroku.com/pricing#team-comparison. Allows setting roles and app-level permissions with ease.
Self-hosted option	No
Hosted plans / SaaS	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 Very easy and intuitive process that allows defining a pipeline from code commit, to code review (review apps), user acceptance testing and production deployment, via Heroku Flow. Works best if the project is also hosted on Heroku.
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
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 3rd party add-ons available via Heroku Elements: https://elements.heroku.com/addons. Custom buildpacks are also available for almost any stack you might be using (over 5500 buildpacks available at the moment)
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 Although not specifically built in to Heroku, it's guaranteed that any Ruby specific need that might arise would be solved via add-ons, buildpacks or other integrations available.
Specific language support: JavaScript	Yes Although not specifically built in to Heroku, it's guaranteed that any Javascript specific need that might arise would be solved via add-ons, buildpacks or other integrations available.
Integrations 1st party support for common tools (like Slack notifications, various VCS platforms, etc)	Yes The strongest built-in integrations are with GitHub and Slack (ChatOps) but even allows integrating 3rd party CI servers in the workflow if you so require, among others.
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 Offers a feature rich API that allows CRUD operations on the most important features, such as promoting an app to production, or inspecting a specific pipeline.
Auditing	Yes
Additional notes

Programming Language	Supported test runners	Installation guide	Knapsack Pro Library README / Source
Ruby	RSpec, Cucumber, Minitest, test-unit, Spinach, Turnip	Install	knapsack_pro gem
JavaScript	Cypress.io	Install	@knapsack-pro/cypress
JavaScript	Jest	Install	@knapsack-pro/jest
JavaScript / TypeScript	Any test runner in JavaScript	How to build native integration with Knapsack Pro API to run tests in parallel for any test runner	@knapsack-pro/core
Any programming language	Any test runner	How to build a custom Knapsack Pro API client from scratch in any programming language	-

Heroku CI pros & cons features of Continuous Integration server Why choose Heroku CI? See product overview

Heroku CI

Heroku Flow

SaaS

No (partial)

Yes

Yes

Yes

N/A

Yes

Yes

Yes

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

How to run parallel tests on Heroku CI to execute 1-hour test suite in 2 minutes?

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Heroku CI parallelism integration

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Heroku CI pros & cons features of Continuous Integration server
Why choose Heroku CI? See product overview

How to run parallel tests on Heroku CI
to execute 1-hour test suite in 2 minutes?

How much can you save with faster tests
on Heroku CI?