Prometheus
Splunk
| Feature | Prometheus | Splunk |
|---|---|---|
| Pricing | Free only | Contact sales |
| Free Plan | ✓ Yes | ✗ No |
| Rating | 4.5 / 5 | 4.3 / 5 |
| Best For | devops-engineers, sre-teams, kubernetes-users, infrastructure-teams | enterprise, security-teams, devops-engineers, data-analysts |
| Founded | 2012 | 2003 |
| Metrics Collection | ✓ | ✗ |
| Alerting | ✓ | ✓ |
| Promql | ✓ | ✗ |
| Service Discovery | ✓ | ✗ |
| Grafana Integration | ✓ | ✗ |
| Multi Dimensional Data | ✓ | ✗ |
| Log Analysis | ✗ | ✓ |
| Real Time Monitoring | ✗ | ✓ |
| Dashboards | ✗ | ✓ |
| Machine Learning | ✗ | ✓ |
| Siem | ✗ | ✓ |
✓ 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
✓ Splunk Pros
- Powerful search capabilities
- Real-time monitoring
- Extensive app ecosystem
- Enterprise-grade
✗ Splunk Cons
- Very expensive
- Complex pricing
- Resource-intensive
The Verdict
Prometheus is built for devops engineers and sre teams, with a focus on metrics-collection and alerting. Splunk targets enterprise and security teams and leads with log-analysis and real-time-monitoring.
Both tools use custom enterprise pricing — you'll need to contact sales for a quote, which makes direct cost comparison difficult.
Prometheus has a free plan, which gives it a meaningful edge for individuals and small teams exploring their options. Splunk requires a paid subscription from day one.
Both tools are a solid fit for devops engineers — 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.