Trunk
Trunk · Coding
Trunk is an AI-powered DevOps platform built to keep continuous integration pipelines green. It detects, quarantines, and eliminates flaky tests across any language, test runner, or CI provider. It also runs a parallel merge queue that keeps your main branch stable while testing independent pull requests at the same time. Think of it as a DevOps testing platform for teams whose CI/CD workflow has started to slow them down. Teams reach for Trunk when CI noise and merge bottlenecks start capping how fast they ship.
About Trunk
What Is Trunk
Trunk targets two problems that show up once a codebase and a team get big. The first is flaky tests. At tens of thousands of tests, even a 1% flake rate means false failures on nearly every run. Each one burns 10 to 15 minutes of a developer's day while they read logs, rerun jobs, and confirm it was noise. The second is the merge queue. A traditional queue tests pull requests one at a time. So a frontend change waits behind unrelated backend jobs, and queue times grow with every new PR.
Trunk's answer is a CI reliability platform that watches both. Its flaky test tooling uses branch-aware analysis to treat main, PRs, and merge queues differently, fingerprinting failure modes with stack trace embeddings and quarantining unreliable tests so a bad test fails CI only when it's genuinely broken. Its merge queue tests non-overlapping changes at the same time instead of in a single serial line.
The platform works with any language, any test runner, and any CI provider, so you don't have to rewrite a pipeline to adopt it. That's the part teams care about most. What's the catch? It's an engineering-team product. There's no mobile app, and Trunk is aimed at developers who already run CI, not at casual users. It's also sold per committer, which prices small solo projects out more than a free hobby tool would.
Getting Started
- Sign up at app.trunk.io with your Git hosting account and connect the repository you want Trunk to watch.
- Create a Trunk organization, then pick the problem that hurts more on your team: flaky tests or merge queue serialization.
- Install the Trunk CLI or the GitHub app so Trunk can start collecting test spans and PR data from your existing pipeline.
- Let Trunk analyze a few runs, then review the flaky tests it flags directly in your PR comments and quarantine the ones you agree with.
- Expand to the second product once the first is paying off, and add SSO or on-premise deployment later if you move to an Enterprise plan.
Product Information
A quick look at Trunk's pricing, supported platforms, and performance.
Best for
The users, tasks, and scenarios where this tool fits best.
Users
- Platform and DevOps engineers
- Engineering managers at growing companies
- QA-focused developers
Tasks
- Detecting flaky tests
- Quarantining unreliable tests
- Parallelizing merges
Scenarios
- A daily PR backlog
- CI jobs that fail for no clear reason
- Scaling up with AI coding agents
Key features
Flaky Test Detection
Trunk detects flaky tests through branch-aware analysis that treats main, pull requests, and merge queues differently. It fingerprints failure modes using stack trace embeddings and surfaces those differences for quick triage. So you can see whether a failure came from your change or from a test that's simply unreliable. No code changes are required on your side.
Automatic Quarantining
Once a test is flagged, Trunk quarantines it: if a quarantined test fails, CI still passes, which stops known noise from blocking the pipeline. That's the whole point. You can pin business-critical tests as never-quarantine so they always run and always count. The workflow appears in PR comments, showing what failed, why, and whether it's your code or a known issue.
Parallel Merge Queue
Trunk's merge queue uses graph-based parallel lanes that test non-overlapping changes at the same time while still guaranteeing main branch stability. That rips out the single-queue bottleneck where every PR waits its turn. No more standing in line. Slack notifications and parallelism controls let teams tune how aggressively changes merge.
Works With Any CI Setup
The platform is provider-agnostic: it supports any language, any test runner, and any CI provider, and it works with GitHub through the merge queue and PR integrations. Teams don't have to migrate their pipeline to a new system to adopt Trunk, which keeps the switch low-risk.
AI-Powered Fix Assistance
Trunk is building AI-powered test fixing through an MCP integration that connects to tools like Claude Code, Codex, and Cursor. Trunk supplies the failure data and CI context, and the agent iterates on the actual fix. Teams in the design partner program already run it to detect flakes, find root causes, and submit fixes with little human involvement.
Code Quality Tooling
Beyond CI, Trunk includes a code quality product with a CLI and a VS Code extension. It adds inline annotations on GitHub pull requests, so linting and formatting issues surface where developers already review code instead of in a separate report.
Team Management and Security
The Team plan removes the committer cap and adds onboarding support, while Enterprise adds SSO, on-premise deployment, admin tools, and custom billing. Data is encrypted in transit and at rest, with SOC 2 Type 2 compliance and a US data residency option.
Pros and cons
Pros
- Works with any language, test runner, and CI provider, so adoption doesn't force a pipeline rewrite.
- The flaky test and merge queue products can be tried separately, letting teams start with whichever problem hurts more.
- Quarantined tests keep CI green without hiding failures, and PR comments explain each one.
- A genuinely free tier for teams up to five committers, with no upfront cost to evaluate.
- Enterprise options cover SSO, on-premise deployment, and US data residency for regulated teams.
Cons
- Pricing is per committer and scales with team size, so large engineering orgs pay noticeably more than small ones.
- There's no mobile app or consumer-facing product, which means it's useless to anyone who doesn't already run CI.
- Some of the most interesting automation, like AI-powered test fixing, is still in a design partner program rather than generally available.
Frequently asked questions
Trunk is a CI reliability platform that fixes two problems: flaky tests that fail for reasons unrelated to your code, and merge queues that process pull requests one at a time. It detects and quarantines unreliable tests and runs a parallel merge queue to keep your main branch stable.
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