Prometheus vs Datadog: Which is Better in 2026?
Choosing between Prometheus and Datadog comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Bottom line: Datadog is our overall pick for monitoring workflows. Pick Prometheus if you need a fully free option.
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
Prometheus
Monitoring and alerting toolkit
Best for you if:
- • You need something completely free
- • Prometheus is an open-source monitoring system with a time-series database
- • It collects metrics, provides alerting, and powers Grafana dashboards
Datadog
Cloud monitoring, security, and AI investigations for DevOps
Best for you if:
- • Cloud monitoring and security platform
- • Unified observability across infrastructure
| At a Glance |  Prometheus |  Datadog |
|---|---|---|
Starts at | Free | $15/host/month (annual)Infrastructure Pro |
Best For | Monitoring | Monitoring |
Rating | - | - |
Choose Prometheus or Datadog?
Choose Prometheus if
Monitoring and alerting toolkit
- Industry standard
- Great for metrics
- Open source
- You want a fully free tool (Datadog requires payment)
Choose Datadog if
Cloud monitoring, security, and AI investigations for DevOps
- Comprehensive platform
- Great visualizations
- 700+ integrations
| Feature | Prometheus | Datadog |
|---|---|---|
| Pricing Model | Free | Freemium |
| User Rating | ★4.3/5 135 reviews | ★4.4/5 1,156 reviews |
| Categories | MonitoringDevOps | MonitoringLog Management |
In-Depth Analysis
Prometheus
Monitoring and alerting toolkit
Strengths
- +Industry standard
- +Great for metrics
- +Open source
Weaknesses
- -Long-term storage
- -Learning curve
Key features
Datadog
Cloud monitoring, security, and AI investigations for DevOps
Strengths
- +Comprehensive platform
- +Great visualizations
- +700+ integrations
Weaknesses
- -Complex pricing
- -Can be expensive
Key features
Pricing: Prometheus vs Datadog
| Plan | Prometheus | Datadog |
|---|---|---|
| Tier 1 | Free Free | Free Free |
| Tier 2 | N/A | $15 /host/month (annual) Infrastructure Pro |
| Tier 3 | N/A | $23 /host/month (annual) Infrastructure Enterprise |
| Tier 4 | N/A | $31 /host/month (annual, with Infra) APM |
| Tier 5 | N/A | $40 /host/month (annual, with Infra) APM Enterprise |
Pricing verified from each vendor's public pricing page. Compare in detail on Prometheus pricing and Datadog pricing.
Who Should Use What?
On a budget?
Prometheus is free. Datadog is freemium.
Go with: Prometheus
Want the highest-rated option?
Neither has user reviews yet.
Go with: Prometheus
Value user reviews?
Neither has user reviews yet.
Go with: Datadog
3 Questions to Help You Decide
What's your budget?
Prometheus is free. Datadog is freemium. Go with Prometheus if free matters most.
What's your use case?
Both are monitoring tools. Compare their specific features to decide.
How important are ratings?
Neither has user reviews yet.
Key Takeaways
Datadog
- Higher user rating: 4.4/5 vs 4.3/5
- Larger review base (1,156 reviews)
- Free tier available
- Our pick for this comparison
Prometheus
- Completely free
The Bottom Line
Datadog is our pick. That said, Prometheus is free, hard to beat on price.
Frequently Asked Questions
Is Prometheus or Datadog better?
Datadog is rated in our evaluation. Prometheus is free and Datadog is freemium.
What are Prometheus and Datadog used for?
Prometheus: Monitoring and alerting toolkit. Datadog: Cloud monitoring, security, and AI investigations for DevOps.
What does Prometheus cost vs Datadog?
Prometheus is completely free. Datadog is freemium (free tier + paid plans). Visit their websites for detailed pricing.