Prometheus

Prometheus is ranked #10 of 49 in Kubernetes monitoring on Freedom251. It runs on Linux, macOS, Self-hosted, Web, Windows. There is a free plan.

Prometheus plans and pricing

All plans

Prometheus Free Open-source monitoring and alerting toolkit · Apache 2.0 license prometheus.io · 30 Sept 2026

Compared on Kubernetes monitoring

Free plan: Yes

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$149/mo6.7

Prometheus

What it does: Prometheus is an open-source systems monitoring and alerting toolkit that collects and stores metrics as time series.
Data model: Time series are identified by a metric name and key-value labels, and PromQL provides a flexible query language for querying them.
Collection: Prometheus collects time series by pulling over HTTP, supports pushing through an intermediary gateway, and discovers targets through service discovery or static configuration.
Architecture: The main Prometheus server runs as a standalone monolithic binary without external dependencies.
Integrations: The ecosystem includes client libraries, exporters, Pushgateway, and Alertmanager; integrations also include Grafana for visualization and webhook-based alert notifications.
Deployment: Official components have precompiled binaries and Docker images, and the Prometheus download page lists Windows, macOS, and Linux builds.
Security: Prometheus and most exporters support TLS, including client certificate authentication, and HTTP Basic Authentication is also supported.
Security guidance: The project advises against exposing Prometheus component HTTP endpoints to publicly accessible networks unless appropriate protective measures are in place.
Reliability: Prometheus servers are autonomous and do not depend on network storage or other remote services, which the project says helps make them useful during outages.
Notable limitation: Prometheus is not recommended for use cases requiring 100% accurate data, such as per-request billing.
Support: The project offers community support through channels including Slack, mailing lists, and a Discourse forum, and lists independent commercial support providers separately.
Maintenance: Prometheus is maintained by volunteers, and security fixes are handled on a best-effort basis, with a stated aim to release fixes within seven days for several core projects.
Founded: 2012
Price from: Free

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Where it ranks on Freedom251

Best Kubernetes Monitoring in 2026#10 of 49
Best Container Monitoring in 2026#17 of 45
Best Time-Series Databases in 2026#3 of 36
Best Metrics Monitoring Tools in 2026#7 of 33
Best Alert Management Software in 2026#4 of 30
Best Infrastructure Monitoring in 2026#6 of 28
Best Cloud Monitoring in 2026#5 of 21

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Sources

prometheus.io/docs/introduction/overview/· checked 30 Sept 2026
prometheus.io/docs/introduction/faq/· checked 30 Sept 2026
prometheus.io/download/· checked 30 Sept 2026
prometheus.io/docs/operating/security/· checked 30 Sept 2026
prometheus.io/community/· checked 30 Sept 2026
prometheus.io· checked 28 Sept 2026