OpenObserve vs Prometheus: Pricing and Ratings Compared (2026)
Entry prices and free plans as read on each vendor's pricing page, and user ratings as published on review sites, for OpenObserve and Prometheus side by side. This page compares data; it is not a hands-on review.
On the data: On the data below, Prometheus leads on a free plan. We do not name an overall winner for this pair.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, here's who should pick what:
OpenObserve
Open source, petabyte-scale observability for logs, metrics, and traces at a fraction of the cost.
Best for you if:
- • You want significantly lower storage costs (up to 140x compared to Elasticsearch)
Prometheus
Monitoring and alerting toolkit
Best for you if:
- • You want a fully free tool (OpenObserve requires payment)
| At a Glance | OpenObserve | Prometheus |
|---|---|---|
Starts at | Not published | Free 100% free |
Category | Monitoring Log Management | DevOps Monitoring |
Rating | n/a | 4.5/5 G2 4.5 61 reviews |
Free plan | No | Yes |
Watch out for | Audit Trail is 2% of monthly spend. | Storage costs grow linearly with metric cardinality and retention period |
Choose OpenObserve or Prometheus?
Choose OpenObserve if
- You want significantly lower storage costs (up to 140x compared to Elasticsearch)
- You want high performance and scalability, capable of handling petabytes of data
- You work in monitoring, not DevOps
Choose Prometheus if
- You want a fully free tool (OpenObserve requires payment)
- You want industry standard
- You want great for metrics
- You work in DevOps, not monitoring
In-Depth Analysis
OpenObserve
Open source, petabyte-scale observability for logs, metrics, and traces at a fraction of the cost.
OpenObserve's Pay As You Go model offers a fair and transparent pricing structure, especially for ingestion at $0.50 per GB and querying at $0.01 per GB, which can be competitive for high-volume users.
Watch out
Audit Trail is 2% of monthly spend.
Strengths
- Pro: Significantly lower storage costs (up to 140x compared to Elasticsearch).
- Pro: High performance and scalability, capable of handling petabytes of data.
- Pro: Open-source nature allows for community contributions, security audits, and full control.
- Pro: Unified platform for logs, metrics, and traces simplifies observability.
- Pro: Supports open standards and protocols for vendor-neutral integration.
Weaknesses
- Con: Pricing for advanced features like AI Assistant and AI SRE Agent is currently in preview, future costs are not fully detailed.
- Con: Requires some technical expertise for self-hosting and managing storage buckets.
Key features
Prometheus
Monitoring and alerting toolkit
Prometheus is 100% free and open source (Apache 2.0).
Watch out
Storage costs grow linearly with metric cardinality and retention period
Strengths
- Pro: Industry standard
- Pro: Great for metrics
- Pro: Open source
Weaknesses
- Con: Long-term storage
- Con: Learning curve
Key features
Plans and prices: OpenObserve vs Prometheus
| Tool | Plans and prices | Source |
|---|---|---|
| OpenObserve |
| openobserve.ai/pricing read Oct 22, 2026 |
| Prometheus |
| prometheus.io read Oct 2, 2026 |
Prices as read on each vendor's own pricing page on the date shown. Plans are listed per tool and are not matched against the other tool's plans: a plan name or price in one column says nothing about the same row in the other. Details on OpenObserve pricing and Prometheus pricing.
Key Takeaways
OpenObserve
- Choose if you want open source, petabyte-scale observability for logs, metrics, and traces at a fraction of the cost
Prometheus
- Has a free plan
What the data shows
On the data below, Prometheus leads on a free plan. We do not name an overall winner for this pair.
- Only Prometheus has a published user rating (4.5/5 from 61 reviews); OpenObserve has none we can show.
- Only Prometheus has a free plan.
Criteria: user rating (only above 20 reviews on both sides, gap of 0.2 or more), entry price (only on the same billing basis), free plan. How we rate
Frequently Asked Questions
How do OpenObserve and Prometheus compare in 2026?
On the data below, Prometheus leads on a free plan. We do not name an overall winner for this pair. Only Prometheus has a published user rating (4.5/5 from 61 reviews); OpenObserve has none we can show. Only Prometheus has a free plan.
What are OpenObserve and Prometheus used for?
OpenObserve: Open source, petabyte-scale observability for logs, metrics, and traces at a fraction of the cost. Prometheus: Monitoring and alerting toolkit.
What does OpenObserve cost vs Prometheus?
OpenObserve has no public paid-plan price on file. Prometheus is free. Prices read on the vendors' pricing pages, latest check Oct 22, 2026.
What's the main difference between OpenObserve and Prometheus?
OpenObserve's main strength: significantly lower storage costs (up to 140x compared to Elasticsearch). Prometheus's main strength: industry standard.