Semaphore
Tenable
| Feature | Semaphore | Tenable |
|---|---|---|
| Pricing | Free / from $10/mo | Free / from $3990/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.3 / 5 | 4.3 / 5 |
| Best For | development-teams, open-source-projects, startups, monorepo-users | security-teams, compliance-officers, it-operations, vulnerability-managers |
| Founded | 2012 | 2002 |
| Parallel Pipelines | ✓ | ✗ |
| Test Reports | ✓ | ✗ |
| Secrets Management | ✓ | ✗ |
| Docker Support | ✓ | ✗ |
| Caching | ✓ | ✗ |
| Notifications | ✓ | ✗ |
| Vulnerability Scanning | ✗ | ✓ |
| Asset Discovery | ✗ | ✓ |
| Risk Prioritization | ✗ | ✓ |
| Compliance Reporting | ✗ | ✓ |
| Web App Scanning | ✗ | ✓ |
| Cloud Security | ✗ | ✓ |
✓ Semaphore Pros
- Extremely fast build times
- Generous free tier for open source
- Easy YAML-based configuration
- Built-in secrets management
✗ Semaphore Cons
- Smaller community than GitHub Actions
- Limited marketplace for pre-built steps
- Debugging failed builds can be tricky
✓ Tenable Pros
- Comprehensive vulnerability coverage
- Excellent asset discovery
- Good risk prioritization
- Strong compliance reporting
✗ Tenable Cons
- Expensive for large environments
- Complex initial setup
- Scanning can impact performance
The Verdict
Semaphore is built for development teams and open source projects, with a focus on parallel-pipelines and test-reports. Tenable targets security teams and compliance officers and leads with vulnerability-scanning and asset-discovery.
On pricing, Semaphore is the clear winner for budget-conscious users — starting at $10/mo compared to $3990/mo for Tenable. That $3980/mo difference adds up quickly for growing teams.
Both offer free plans, so you can test each with your real workflow before committing to a subscription.
This is a genuinely close comparison. If you can, sign up for both free trials (where available) and run a one-week test with your actual team tasks before deciding.