TeamCity 856 , from JetBrains, is the closest commercial counterpart to Jenkins 8,793 : a self-hosted server with agents, configured in the UI or in Kotlin code kept in the repository, with strong .NET and JVM support and features Jenkins needs plugins for, such as build chains across projects and test history with flaky-test detection. The free Professional license includes 3 build agents and up to 100 build configurations. Enterprise removes that limit and adds a year of upgrades and priority support; JetBrains' store lists it at $2,399 a year with 3 agents, and further agents at $359 each. TeamCity Cloud, the hosted edition, starts at $15 a month billed annually.
Buildkite 4,678 splits the difference between hosted and self-hosted: its SaaS control plane schedules the pipelines and shows the results, while jobs run on agents in your own network or cloud (github.com/buildkite/agent (https://github.com/buildkite/agent 1,080 ), MIT, v4.0.6), so the source code stays on your machines. The Free plan covers 5 users and 10 concurrent jobs; Pro costs $30 per active user a month with 10 agents included; its optional hosted Linux agents cost $0.004 per vCPU-minute.
Commercial servers sell an integrated product and a vendor to call when an upgrade breaks, for license fees and a smaller ecosystem than Jenkins' plugins.