Fly.io
Tenable
| Feature | Fly.io | Tenable |
|---|---|---|
| Pricing | Free / from $0/mo | Free / from $3990/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.2 / 5 | 4.3 / 5 |
| Best For | full-stack-developers, global-apps, edge-computing, hobby-projects | security-teams, compliance-officers, it-operations, vulnerability-managers |
| Founded | 2017 | 2002 |
| Global Deployment | ✓ | ✗ |
| Firecracker Vms | ✓ | ✗ |
| Fly Postgres | ✓ | ✗ |
| Auto Scaling | ✓ | ✗ |
| Volumes | ✓ | ✗ |
| Private Networking | ✓ | ✗ |
| Gpu Support | ✓ | ✗ |
| Vulnerability Scanning | ✗ | ✓ |
| Asset Discovery | ✗ | ✓ |
| Risk Prioritization | ✗ | ✓ |
| Compliance Reporting | ✗ | ✓ |
| Web App Scanning | ✗ | ✓ |
| Cloud Security | ✗ | ✓ |
✓ Fly.io Pros
- Deploy apps globally to 30+ regions easily
- Built-in Postgres and Redis for data at the edge
- Generous free tier for hobby projects
- Firecracker VMs start in milliseconds
✗ Fly.io Cons
- Operational complexity for simple apps
- Documentation can be hard to navigate
- Billing surprises if auto-scaling triggers unexpectedly
✓ 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
Fly.io is built for full stack developers and global apps, with a focus on global-deployment and firecracker-vms. Tenable targets security teams and compliance officers and leads with vulnerability-scanning and asset-discovery.
On pricing, Fly.io is the clear winner for budget-conscious users — starting at $0/mo compared to $3990/mo for Tenable. That $3990/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.
Feature-wise, Fly.io offers broader built-in capabilities (7 features vs 6), while Tenable takes a more focused approach — which can mean a simpler, faster onboarding experience.
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.