Prometheus is an open-source monitoring and alerting toolkit designed for reliability. Pull-based metrics collection scales to thousands of targets. Powerful query language PromQL enables flexible analysis. Built-in alerting with Alertmanager integration. CNCF graduated project used by enterprises worldwide. The standard for metrics monitoring in cloud-native environments.

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Louis Corneloup Updated Jul 20, 2026 · how we evaluate Source prometheus.io ↗

Ratings Across the Web

4.5 (61 reviews)

Prometheus holds an aggregate rating of 4.5 out of 5 from 61 reviews across G2, last checked September 17, 2026.

G2 61 reviews

4.5/5

Ratings aggregated from independent review platforms. Learn more

Key Features

Monitoring
Time series
PromQL
Alerting
CNCF
Open source

Pricing Plans

Pricing checked Oct 2, 2026

Prometheus plans and prices, checked October 2026
Plan	Price	Details
Free Popular	$0	Open source Time series DB PromQL Alerting +1 more Show less Service discovery

View full pricing

Is Prometheus worth the price?

Great value

Prometheus is 100% free and open source (Apache 2.0).

Zero licensing costs ever. The real costs are operational: storage, compute for the server, and engineering time to manage retention, federation, and high availability.

Most teams eventually pay for managed Prometheus (Grafana Cloud, Amazon Managed Prometheus, or Thanos for long-term storage).

Hidden Costs & Gotchas

Storage costs grow linearly with metric cardinality and retention period

No built-in long-term storage -- need Thanos, Cortex, or managed solution

No native high availability -- requires manual federation or Thanos

Amazon Managed Prometheus

$0.03 per 10M metric samples ingested, $0.003 per 10M samples queried

Engineering time to manage and tune TSDB, alerting rules, and scrape configs

Full Prometheus pricing: every plan, hidden costs and alternatives

Reviews

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4.5/5

Across 61 verified user reviews on G2

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Best Prometheus Alternatives

Top alternatives based on features, pricing, and user needs.

View full list →

Datadog Freemium

Cloud monitoring, security, and AI investigations for DevOps

4.4

Zabbix Freemium

The universal, open-source observability solution for IT & OT infrastructure.

4.5

Grafana Freemium

Observability and visualization platform

4.5

Influxdb Freemium

High-speed time-series database for real-time analytics

4.5

Nagios Freemium

The industry standard in open-source IT monitoring tools for servers, networks, applications, and services.

4.5

VictoriaMetrics Freemium

Simple, reliable, and efficient monitoring for everyone, built by engineers for engineers.

See all monitoring tools →

Still deciding?

Most buyers shortlist 2 or 3 tools before committing. Pull a side-by-side comparison or browse the full alternatives shortlist below.

All Prometheus alternatives 6+ tools ranked, pricing + verdict per pick Prometheus vs Datadog Head-to-head: features, pricing, who wins Prometheus vs Zabbix Head-to-head: features, pricing, who wins Prometheus vs Grafana Head-to-head: features, pricing, who wins

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Prometheus FAQ

How does Prometheus facilitate monitoring in cloud-native environments?

Prometheus is an open-source monitoring and alerting toolkit that has become the standard for metrics monitoring in cloud-native environments. It uses a pull-based model for metrics collection, which scales efficiently to thousands of targets. This design allows it to effectively gather operational data from dynamic cloud infrastructure.

What kind of user benefits most from Prometheus?

Prometheus is best suited for DevOps teams and site reliability engineers who require robust monitoring and alerting for their systems. Its powerful query language, PromQL, enables flexible analysis of metrics, making it ideal for those who need deep insights into their application and infrastructure performance.

How is Prometheus priced?

Prometheus is free to use, as it is an open-source project. There is no paid plan required to access its features for monitoring and alerting.

Can Prometheus be integrated with other alerting tools?

Yes, Prometheus includes built-in alerting capabilities and integrates with Alertmanager. This allows users to manage and route alerts effectively based on the metrics collected.

What are the main limitations of using Prometheus?

A primary limitation of Prometheus is its approach to long-term storage, which can require additional considerations for extended data retention. Additionally, users may encounter a learning curve when first adopting the toolkit due to its powerful, but specific, query language and configuration.

How does Prometheus compare to Datadog for monitoring?

Prometheus is an open-source monitoring and alerting toolkit, offering a free-to-use solution that is an industry standard for metrics. In contrast, Datadog is a commercial monitoring platform that typically offers a broader range of features beyond just metrics, often including logs and traces, under a paid subscription model.

Source: prometheus.io

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