Prometheus

Name: Prometheus
Brand: Prometheus
Rating: 4.4 (71 reviews)

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Monitoring and alerting toolkit

Monitoring DevOps Analytics

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4.4(71 across the web)

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Reviews onG2Capterra

71 reviews tracked

The Bottom Line

Entry price

Free, no paid tier

Biggest pro

Industry standard

Biggest con

Long-term storage

TL;DR - Prometheus

Prometheus is an open-source monitoring system with a time-series database
It collects metrics, provides alerting, and powers Grafana dashboards
Completely free and open-source

Pricing: Free forever

Best for: Individuals & startups

4.4/5 across review platforms

What is Prometheus?

Editorial review

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.

Available on: Web

LCLouis CorneloupUpdated Jul 20, 2026 · how we evaluateSourceprometheus.io ↗

Pros & Cons

Pros

Industry standard
Great for metrics
Open source

Cons

Long-term storage
Learning curve

Ratings Across the Web

4.4(71 reviews)

Prometheus holds an aggregate rating of 4.4 out of 5 from 71 reviews across G2 and Capterra, last checked August 25, 2026.

Ratings aggregated from independent review platforms. Learn more

Key Features

MonitoringTime seriesPromQLAlertingCNCFOpen source

Pricing Plans

Pricing checked Aug 22, 2026

Free

Open source

Time series DB
PromQL
Alerting
Service discovery

Calculate your cost View full pricing

Is Prometheus worth the price?

100/100

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

Grafana Cloud managed Prometheus costs $6.50/1K active series (Pro) or $3/1K (Enterprise)

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

How Prometheus Compares to Competitors

Datadog costs $15-$23/host/month for infrastructure monitoring. Victoria Metrics is also free OSS with better storage efficiency and easier clustering. Thanos extends Prometheus with HA and long-term storage at zero licensing cost.

Reviews

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4.4/5

Across 71 verified user reviews on G2, Capterra

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Best Prometheus Alternatives

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

View full list →

DatadogFreemium

Cloud monitoring, security, and AI investigations for DevOps

4.5

ZabbixFreemium

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

4.5

GrafanaFreemium

Observability and visualization platform

4.5

NagiosFreemium

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

4.6

InfluxdbFreemium

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

4.6

VictoriaMetricsFreemium

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 alternatives6+ tools ranked, pricing + verdict per pick Prometheus vs DatadogHead-to-head: features, pricing, who wins Prometheus vs ZabbixHead-to-head: features, pricing, who wins Prometheus vs GrafanaHead-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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