Prometheus
Spacelift
| Feature | Prometheus | Spacelift |
|---|---|---|
| Pricing | Free only | Free / from $35/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.5 / 5 | 4.4 / 5 |
| Best For | devops-engineers, sre-teams, kubernetes-users, infrastructure-teams | platform-teams, devops-engineers, infrastructure-teams, enterprises |
| Founded | 2012 | 2020 |
| Metrics Collection | ✓ | ✗ |
| Alerting | ✓ | ✗ |
| Promql | ✓ | ✗ |
| Service Discovery | ✓ | ✗ |
| Grafana Integration | ✓ | ✗ |
| Multi Dimensional Data | ✓ | ✗ |
| Iac Orchestration | ✗ | ✓ |
| Policy Engine | ✗ | ✓ |
| Drift Detection | ✗ | ✓ |
| Modules Registry | ✗ | ✓ |
| Vcs Integration | ✗ | ✓ |
| Approval Workflows | ✗ | ✓ |
✓ Prometheus Pros
- Free and open-source
- Powerful query language
- Great Kubernetes integration
- Active community
✗ Prometheus Cons
- No built-in long-term storage
- Complex setup
- Steep learning curve
✓ Spacelift Pros
- Multi-IaC support
- Excellent policy engine
- Good drift detection
- Strong collaboration tools
✗ Spacelift Cons
- Premium pricing
- Newer platform less proven
- Learning curve for policies
The Verdict
Prometheus is built for devops engineers and sre teams, with a focus on metrics-collection and alerting. Spacelift targets platform teams and devops engineers and leads with iac-orchestration and policy-engine.
Prometheus uses custom enterprise pricing, while Spacelift starts at $35/mo — a tangible advantage for teams with a fixed budget.
Both offer free plans, so you can test each with your real workflow before committing to a subscription.
Both tools are a solid fit for devops engineers, infrastructure teams — in those cases, the decision often comes down to workflow style and how your team prefers to organize work.
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.