Semaphore
CI built for coding agents. Just tell your agent what you want, it runs your CI. Pay only for what you run. $15 free monthly. SOC 2 certified.
Editor's Verdict
Key Takeaways
- Agent-Native CI
- No Setup Required
- Testbox Pre-Push Checks
- Reliable Execution
In-Depth Review: What is Semaphore?
Semaphore is an open-source CI platform purpose-built for AI coding agents. Agents automatically set up and optimize CI pipelines, catching issues before push with fast, reproducible sandboxes. Pay-as-you-go pricing with no per-seat fees and $15 free monthly usage. Enterprise-ready with SOC 2, SAML SSO, RBAC, audit logs, and 24/7 support. Trusted by Confluent, GoCo, and more.
Core Features
Agent-Native CI
CI built specifically for coding agents like Claude Code and Codex, allowing agents to set up and run your CI automatically.
No Setup Required
No configuration needed. Just tell your agent what you want, and it sets up CI for you, connecting to Semaphore along the way.
Testbox Pre-Push Checks
Run changes in a quick, production-identical sandbox before pushing, catching problems early with warm caching for fast checks.
Reliable Execution
Stable, reproducible test runs that pass more often on first try, reducing re-runs and shortening PR-to-merge time.
Self-Optimizing CI
CI that automatically spots slow steps and flaky tests, fixing them as your codebase grows, with built-in maintenance and optimization.
Fast & Affordable
Pay only for what you run with no per-seat fees or idle costs. Every organization gets $15 of free usage per month.
Enterprise-Ready Security
SOC 2 Type II certified, with SAML SSO, role-based access control, audit logs, and managed secrets.
Open Source
Fully open source – read the code, self-host, and audit every claim. Community-starred on GitHub.
Pricing
Free
- $15 free credits per month (≈2,000 Ubuntu 2vCPU minutes)
- 20 concurrent jobs
- Free artifacts (20GB egress, 100GB storage per month)
- 9.6 GB cache per project
- Free support (account setup, Git integration)
Basic Support
- Email support
- During business hours (Mon-Fri 7am-8pm UTC)
- No guaranteed response times
Priority Response
- Email + Slack support
- Best-effort accelerated responses 24/5
SLA Standard
- Email + Slack + Customer Portal
- Guaranteed fast responses 24/5
- SLA: P1 4h, P2 1 day, P3 3 days, P4 1 week
SLA Premium
- Email + Slack + Customer Portal
- Priority queue 24/5 (optional 24/7)
- SLA: P1 1h, P2 2h, P3 1 day, P4 3 days
Visibility Success
- Annual Optimization Session
- Group Technical Q&A (quarterly)
- New Feature Demo (shared)
Performance Success
- All in Visibility (private sessions)
- Annual Tech issue solving session (deep dive)
- Guided Onboarding for new Key Contact
Scale Success
- All in Performance (customized lens)
- Annual Business Review
- Continuous Account Monitoring
- Customized Team Training
- Quarterly Technical Q&A / issue solving
Alliance Success
- All in Scale (strategic & customized lens)
- Strategic Roadmap Discussion with Product
- Project management of key issues
- Custom terms
- Security & risk reviews
- Engineering Access
Pros and Cons
Pros
- Fastest CISemaphore has the fastest average build time (5m 01s) compared to other leading CI/CD providers.
- Most AffordableLowest cost per job ($0.04) and pay-as-you-go pricing with no per-seat fees or idle costs.
- Agent-NativeBuilt for coding agents, allowing automated setup and self-optimizing pipelines without manual configuration.
- Open SourceFully open source code that can be self-hosted, audited, and trusted by security-conscious teams.
- Enterprise-ReadySOC 2 certified with SAML SSO, RBAC, audit logs, managed secrets, and 24/7 expert support.
Cons
- Requires Coding AgentOptimized for agent-based CI workflows, may not suit teams that prefer traditional YAML configuration or manual CI setup.
- Complex Pricing StructureMultiple add-ons (support plans, success plans, dedicated cache, etc.) can make total cost unclear without careful calculation.
- Limited CustomizabilityThe 'no setup' philosophy reduces flexibility for teams that need fine-grained control over pipeline configuration.
- Dependence on Agent CompatibilityWorks best with specific agents (Claude Code, Codex); other agents may not be fully supported.
- Self-Hosting ComplexityWhile open source, self-hosting requires infrastructure management and may not be trivial for small teams.
Use Cases & Recommended Professions
Software Engineer→ View Toolkit
Needs fast, reliable CI to quickly iterate on code, catch bugs before merging, and reduce build times.
DevOps Engineer→ View Toolkit
Manages CI/CD pipelines and seeks a low-maintenance, agent-driven solution that optimizes itself and reduces operational overhead.
QA Engineer→ View Toolkit
Benefits from pre-push sandbox testing and stable environments to catch flaky tests early and ensure quality.
Engineering Manager→ View Toolkit
Wants to increase team velocity, reduce CI costs, and have enterprise controls without manual configuration overhead.
Startup CTO→ View Toolkit
Needs affordable, scalable CI with free tier and no per-seat fees to support a growing team on a budget.
Security Engineer→ View Toolkit
Requires SOC 2 compliance, audit logs, RBAC, and managed secrets for secure CI/CD in regulated environments.
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ℹ️ Curation Disclosure: The overview and features of Semaphore were synthesized using AI and fact-checked by our curation team to ensure accuracy.
