Buildkite vs Semaphore

Buildkite Pipelines is a CI/CD platform that dispatches pipeline steps as jobs to agents. Agents can be hosted by Buildkite or run in a customer's own infrastructure, including on-premises and cloud environments. Dynamic pipelines can generate and upload steps during a build, allowing a workflow to respond to code changes, test results or runtime logic. Test Engine collects results across testing frameworks and provides tools to track, analyze and act on them. It can detect and quarantine flaky tests, split tests across parallel jobs, and monitor test performance, reliability and ownership. Documented integrations include Slack, PagerDuty, Datadog, Honeycomb, OpenTelemetry, Amazon EventBridge, Artifactory, Docker Hub and Backstage. Buildkite lists TLS 1.2+ for data in transit and AES-256 encryption at rest, along with an annually audited SOC 2 Type II report. The Free Plan costs nothing and allows up to 5 users and 10 concurrent jobs. Pro costs $30 a month, billed per active user monthly, and includes up to 50 users and up to 250 concurrent agents, with 10 included.

Semaphore is an AI-native CI/CD platform for building, testing, releasing, and deploying code. Teams organize automated development tasks into workflows containing one or more pipelines. Its visual Workflow Builder represents pipelines, creates YAML configuration, and displays performance feedback. Repositories can connect from GitHub, GitLab, or Bitbucket. Teams can use hosted jobs or run self-hosted agents on Linux, macOS, or Windows; those agents can autoscale with Kubernetes or AWS. Semaphore is open source under Apache 2.0 and can be self-hosted. The default concurrency is 20 jobs, with higher limits available on request. Artifact use is free up to 20 GB monthly egress and 100 GB monthly storage; additional usage is charged separately. A free plan includes account, project, and Git integration assistance, while advanced CI troubleshooting is offered through paid support. Listed paid support begins with Basic Support at $50 a month. Semaphore says data is encrypted in transit and at rest, and that it holds SOC 2 Type 2 and ISO 27001:2022 certifications. Pricing includes free usage credits and per-minute compute charges.