OpenLLMetry vs Prometheus: Which Should You Choose in 2026?
Choosing between OpenLLMetry and Prometheus 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.
By Toolradar Team · Last updated February 28, 2026 · Methodology
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
OpenLLMetry
Open-source observability for LLMs using OpenTelemetry.
Best for you if:
- • You need monitoring features specifically
- • Open-source observability for LLMs.
- • Uses OpenTelemetry for standardized data.
Prometheus
Monitoring and alerting toolkit
Best for you if:
- • You want the higher-rated option (8.8/10 vs 0.0/10)
- • You need something completely free
- • You need data visualization features specifically
- • Prometheus is an open-source monitoring system with a time-series database
- • It collects metrics, provides alerting, and powers Grafana dashboards
| At a Glance |  Prometheus | |
|---|---|---|
Price | Free + Paid | Free |
Best For | Monitoring | Data Visualization |
Rating | —/100 | 88/100 |
| Feature | OpenLLMetry | Prometheus |
|---|---|---|
| Pricing Model | Freemium | Free |
| Editorial Score | — | 88 |
| Community Rating | No ratings yet | No ratings yet |
| Total Reviews | 0 | 0 |
| Community Upvotes | 0 | 0 |
| Categories | MonitoringAI Observability | Data VisualizationMonitoring |
How OpenLLMetry and Prometheus Compare
OpenLLMetry
Open-source observability for LLMs using OpenTelemetry.
Free tier available
Prometheus
Monitoring and alerting toolkit
Free · 88/100 score
OpenLLMetry is a monitoring tool. Prometheus is in data visualization.
Who Should Use What?
On a budget?
Prometheus is free. OpenLLMetry is freemium.
Go with: Prometheus
Want the highest-rated option?
Prometheus scores 88/100. OpenLLMetry is unrated.
Go with: Prometheus
Value user reviews?
Neither has user reviews yet.
Go with: Prometheus
3 Questions to Help You Decide
What's your budget?
OpenLLMetry is freemium. Prometheus is free. Go with Prometheus if free matters most.
What's your use case?
OpenLLMetry is a monitoring tool. Prometheus is in data visualization. Pick the category that matches your needs.
How important are ratings?
Not all tools have been rated yet.
Key Takeaways
Prometheus
- Higher score: 88/100 vs unrated
- Completely free
- Our pick for this comparison
OpenLLMetry
- Better fit for monitoring
The Bottom Line
Prometheus (88/100) is our pick.
Frequently Asked Questions
Is OpenLLMetry or Prometheus better?
Prometheus scores 88/100 in our evaluation. OpenLLMetry is freemium and Prometheus is free.
What are OpenLLMetry and Prometheus used for?
OpenLLMetry: Open-source observability for LLMs using OpenTelemetry.. Prometheus: Monitoring and alerting toolkit.
What does OpenLLMetry cost vs Prometheus?
OpenLLMetry is freemium (free tier + paid plans). Prometheus is completely free. Visit their websites for detailed pricing.