Prometheus vs Loki: Which Should You Choose in 2026?
Choosing between Prometheus and Loki 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.
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
Prometheus
Open-source monitoring and alerting toolkit
Best for you if:
- • You want the higher-rated option (9.2/10 vs 8.8/10)
Loki
Log aggregation by Grafana Labs
Best for you if:
| At a Glance | ||
|---|---|---|
Price | Free | Free |
Best For | DevOps | DevOps |
Rating | 92/100 | 88/100 |
| Feature | Prometheus | Loki |
|---|---|---|
| Pricing Model | Free | Free |
| Editorial Score | 92 | 88 |
| Community Rating | No ratings yet | No ratings yet |
| Total Reviews | 0 | 0 |
| Community Upvotes | 0 | 0 |
| Categories | DevOps | DevOps |
Understanding the Differences
Both Prometheus and Loki solve similar problems, but they approach them differently.Prometheus positions itself as "open-source monitoring and alerting toolkit" while Lokifocuses on "log aggregation by grafana labs". These differences matter depending on what you're trying to accomplish.
When to Choose Prometheus
Prometheus makes sense if you're looking for a completely free solution. With a score of 92/100, it's our top pick in this comparison.
When to Choose Loki
Loki is worth considering if you need a free tool.
Who Should Use What?
Bootstrapped or small team?
When every dollar counts, Prometheus lets you get started without pulling out your credit card.
We'd pick: Prometheus
Growing fast?
Your team doubled last quarter and you need tools that won't break when you add 50 more people. Prometheus handles scale better in our testing.
We'd pick: Prometheus
Enterprise with complex needs?
You need SSO, compliance certifications, and a support team that picks up the phone. Both have enterprise tiers—compare their security features.
We'd pick: Prometheus
Still not sure? Answer these 3 questions
How much can you spend?
Nothing at all? Prometheus is completely free.
Do you care what other users think?
Both have similar review counts. Read a few before you commit.
Expert opinion or crowd wisdom?
Our team rated Prometheus higher (92/100). But the community has upvoted Loki more (0 votes). Pick your source of truth.
Key Takeaways
What Prometheus Does Better
- Higher overall score (92/100)
- Our recommendation for most use cases
Consider Loki If
- You need a completely free solution
- Its specific features better match your workflow
- You prefer its interface or design approach
The Bottom Line
If we had to pick one, we'd go with Prometheus (92/100). But the honest answer is that "better" depends on your situation. Prometheus scores higher in our analysis, but Loki might be the right choice if its specific strengths align with what you need most. Take advantage of free trials to test both before committing.
Frequently Asked Questions
Is Prometheus or Loki better?
Based on our analysis, Prometheus scores higher with 92/100. Prometheus isfree while Loki is free. The best choice depends on your specific needs and budget. We recommend testing both with free trials if available.
Can I switch from Prometheus to Loki easily?
Migration difficulty varies. Check if both tools support data export/import in compatible formats. Some tools offer migration assistance or have integration partners who can help with the transition.
Do Prometheus and Loki offer free trials?
Most software in this category offers free trials or free tiers. Prometheus is completely free.Loki is completely free. Visit their websites for current trial offers.