Circle CI vs TeamCity comparison of Continuous Integration servers

	Circle CI https://circleci.com	TeamCity https://www.jetbrains.com/teamcity/
Unique feature	Premium Support	Technology awareness
Type of product	SaaS, Self-hosted / On Premise	On Premise
Offers a free plan	Yes Provides a free plan for it's SaaS solution, for up to 1000 build minutes per month, 1 container and 1 concurrent job. On top of this, it has a special Free Tier for open source projects, which extend the number of containers and concurrent jobs available.	Yes They offer a great free professional plan, limited to 100 build configurations and 3 build agents. From there, you pay for each aditional agent you want (discounts if you purchase more than 1 agent at a time). They also provide a free plan for open source, non commercial projects, and steep 50% discounts for startups.
Predictable pricing	Yes Provides a calculator, based on the number of concurrent jobs and containers, which can be used to determine pricing before purchase. They also give a guideline based on the number of developers you employ (2-3 containers per full-time developer)	Yes They have a clear list of prices per number of agents.
Support / SLA	Yes While it's community is not quite as vibrant as it is for Jenkins, CircleCI even offers support premium support for companies who cannot afford any downtime in their CI/CD pipelines (https://circleci.com/support/premium-support/). For the regular plans, all plans except the free tier offer official email support. The free tier only includes community support (Discuss, StackOverflow, etc.)	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 CircleCI can run builds in parallel, each build in a completely isolated environment by using containers.	Yes
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 The SaaS version distributes builds by default, while the self-hosted version has all the tools built-in for managing the cluster of builder machines.	N/A No specific mention that we could find, but judging by the wording used it would appear that tasks can be divided accross different machines.
Containers support / Build environment	Yes CircleCI runs every build in a container, or VM, ensuring an isolated, local scope for each build. The environment is also reset with each build, which can highlight hard-to-track issues related to assumptions about the environment that the project is deployed to.	Yes First class Docker support, among others
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 Available by default in Circle CI: https://circleci.com/docs/2.0/status/#section=jobs. Aditionally, the Insights Dashboard provides a very useful overview on build times, error rates and status for your projects: https://circleci.com/docs/2.0/insights/#section=jobs	Yes Great system overview, even allows building your own dashboards in order to see everything you're interested in at a glance.
Management support How easy is it to manage users / projects / assign roles and permissions and so on	No (partial) Using the Cloud plan for Circle CI requires no dedicated person for maintanence / management of the service. The CircleCI Server option (self-hosted) is also hassle free, as the process of installing and managing CircleCI and it's dependencies is automated. Developers are also given SSH acces to the builds (not the whole environment), while sys-admins can work on the host machine without worry about affecting the builds (which are containerized).	Yes Allows assigning roles, LDAP and Windows domain integrations and more.
Self-hosted option	Yes	Yes
Hosted plans / SaaS	Yes	No
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 Pipelines in CircleCI are defined declaratively using an Yaml config file. CircleCI has special provisions for storing secrets in these files.	Yes Unlike most options in the CI/CD space, TeamCity allows defining pipelines using a Kotlin-based DSL. This unlocks a lot of potential, such as templates for common CI/CD tasks, and deep integration with various IDEs (not just JetBrains IDEs)
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 Reports are available	Yes Something that stands out from the rest, allows integrating third party reports, as long as they produce HTML output.
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, partially While CircleCI doesn't natively support plugins, it's core features address all of the core functionality that a CI/CD service needs. For integrating with other platforms or tools, there are integrations such as https://slack.com/apps/A0F7VRE7N-circleci. Certain jobs are available as CircleCI Orbs: https://circleci.com/orbs/	Yes JetBrains has a rich ecosystem of plugins in general.
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 For collecting test metadata and coverage, there is built-in support for Ruby (specifically, Cucumber and RSpec). Setting this up takes very little time and is well-documented on CircleCI's docs.	Yes Using what they call 'Technology Awareness', promises great intehration with Ruby projects, with features such as testing framework support, static analysis and code coverage available out of the box, with no additional work required: https://www.jetbrains.com/teamcity/features/technology_awareness.html
Specific language support: JavaScript	Yes For collecting test metadata and coverage, there is built-in support for Javascript. For code coverage, CircleCI understands Istanbul output (Jest also uses Istanbul for the code coverage reports), while for test metadata, the JUnit output format is natively supported.	No (partial) Unlike Ruby, there's no first class support for Javascript, although they do advertise the fact that their large collections of plugins can cover any use case for Javascript projects: https://plugins.jetbrains.com/teamcity
Integrations 1st party support for common tools (like Slack notifications, various VCS platforms, etc)	Yes Available as CircleCI Orbs: https://circleci.com/orbs/	Yes Great cloud integrations (Google Cloud, AWS, VMWare, etc) as well as 'key' integrations (VSCode, Jira, even NuGet)
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 REST API documentation available at https://circleci.com/docs/api/#api-overview. Creating Orbs is also documented at https://circleci.com/docs/2.0/orb-author/#introduction	Yes Unlike most tools, which offer just a Rest API, TeamCity provides ample opportunity for extension via plugins, their own API, and service messages (formatted messages on stdout)
Auditing	N/A	Yes
Additional notes		Great ecosystem, with a strong focus on integration with other tools (not only JetBrains).

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	-

Circle CI vs TeamCity comparison of Continuous Integration servers What are the differences between Circle CI and TeamCity?

Circle CI

TeamCity

Premium Support

Technology awareness

SaaS, Self-hosted / On Premise

On Premise

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

N/A

Yes

Yes

Yes

Yes

No (partial)

Yes

Yes

Yes

Yes

No

Yes

Yes

Yes

Yes

Yes, partially

Yes

Yes

Yes

Yes

No (partial)

Yes

Yes

Yes

Yes

N/A

Yes

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Circle CI vs TeamCity comparison of Continuous Integration servers
What are the differences between Circle CI and TeamCity?

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

How much can you save with faster tests
on Circle CI and TeamCity?