Captain vs CircleCI

Captain is an open-source command-line tool for finding flaky tests and managing test execution. It measures test reliability, can retry failed tests, and can quarantine flaky ones to unblock builds. By tracking test runtimes, it balances files across parallel jobs. Framework integrations include xUnit, ExUnit, Ginkgo, go test, Bun, Cucumber, Cypress, Jest, Karma, Mocha, Playwright, TestCafe, Vitest, PHPUnit, pytest, unittest, minitest, and RSpec. CI integrations listed include RWX, GitHub Actions, CircleCI, Buildkite, and GitLab. Framework results can be reviewed in a web interface for managing flakes, retries, quarantine, and suite partitioning. Feature availability varies: xUnit does not include partitioning, and Karma does not list retries or partitioning. The free OSS plan includes file-based configuration, partitioning, flaky-test tracking and quarantine, and retries. Pro costs what you agree with the maker, billed per million test results uploaded, and adds analytics on flaky tests and performance trends with 90-day retention.

CircleCI provides CI/CD tooling for engineering teams to ship code and validate changes. Smarter Testing includes test impact analysis, dynamic test splitting, and automatic reruns of failed tests. Execution options include Docker, Linux, Arm, Windows, macOS, and self-hosted runners. CircleCI Cloud supports repositories hosted on GitHub, GitLab, GitLab self-managed, Bitbucket Cloud, and Cursor Origin, which is in beta. Teams can use Orbs, shareable configuration packages, and private orbs are available across listed plans. CircleCI Deploys lets teams monitor incremental releases and roll back automatically. Security controls include encrypted source-code communication, restricted contexts, audit logging, isolated build sandboxes, and OpenID Connect support. CircleCI says it is SOC 2 Type II compliant and has a FedRAMP Tailored designation. Its API supports programmatic interaction with pipelines, projects, and organizations. A free plan is listed, and Performance starts at $15 a month. Free-plan credits expire after a month without rollover; paid credits roll over and expire after a year.