What are the best free alternatives to Datadog?

Grafana, Prometheus, VictoriaMetrics, Beszel, node_exporter. All are reviewed on Stack Gems in the same category (metrics tools); 5 free or open source.

Is there an open-source alternative to Datadog?

Yes: Grafana (AGPL-3.0), Prometheus (Apache-2.0), VictoriaMetrics (Apache-2.0), Beszel (OSS/MIT).

Alternatives · Metrics

Datadog alternatives (2026)

Datadog: The everything platform—if you can afford it.

Its Catch: Expensive at scale—costs surprise teams.

Below: 5 free or free-tier tools from the same category (metrics tools), free and open source first, then the closest match by shared tags. Each keeps its own Catch.

1.GrafanaDashboards for everything observable
Free / OSS · AGPL-3.0 · 77.4k GitHub stars
VerdictThe universal observability dashboard.
CatchDashboard sprawl becomes a maintenance burden. Learning PromQL or LogQL takes time. Self-hosting requires infrastructure.
2.PrometheusTime-series metrics for cloud-native
Free / OSS · Apache-2.0 · 66.6k GitHub stars
VerdictThe foundation of cloud-native metrics.
CatchSingle-node storage limits scale. PromQL has a learning curve. High cardinality labels cause problems.
3.VictoriaMetricsApache-2.0 Prom-compatible TSDB storage swap, not full APM UI
Free / OSS · Apache-2.0 · 17.9k GitHub stars
VerdictApache-2.0 Prom-compatible TSDB. CE free; downsampling/anomaly/multi-tenant Enterprise.
CatchStorage/metrics engine - not Grafana/SigNoz APM UI. Downsampling, anomaly detection (vmanomaly), and advanced multi-tenant stats/rate-limit bits are Enterprise. Distinct from Prometheus encyclopedia and SigNoz all-in-one.
4.BeszelMIT lightweight server + Docker monitoring — PocketBase hub, tiny agents, alerts
Free / OSS · OSS/MIT · 26.3k GitHub stars
VerdictMIT self-hosted server and container monitoring when Prometheus + Grafana is too much — free, quick to run, but a fixed metric set on a single-hub design.
CatchFixed set of host and container metrics, not a general metrics platform: no PromQL, no custom app metrics, no logs or traces. The hub is one PocketBase (SQLite) app, so think small fleets, not hundreds of nodes with long high-resolution retention. The agent needs host access (and the Docker/Podman socket for container stats), so scope it like any privileged daemon. Vs Uptime Kuma (endpoint uptime), Dozzle (container logs) and Prometheus + Grafana (full metrics stack): Beszel is the resource-history-and-alerts middle seat.
5.node_exporterApache-2.0 official Prometheus host-metrics exporter
Free / OSS · Apache-2.0 · 13.9k GitHub stars
VerdictThe first thing to install on any Linux box you want to watch with Prometheus.
CatchIt only exposes metrics: you still need a Prometheus server (or a compatible scraper) to store them and something like Grafana to view and alert on them. Running it in a container needs host networking, the host PID namespace and a read-only bind mount of / with --path.rootfs, or it ends up measuring the container instead of the machine. Windows needs the separate windows_exporter, and NVIDIA GPUs need dcgm-exporter.

FAQ

What are the best free alternatives to Datadog?: Grafana, Prometheus, VictoriaMetrics, Beszel, node_exporter. All are reviewed on Stack Gems in the same category (metrics tools); 5 free or open source.
What is the catch with Datadog?: Expensive at scale—costs surprise teams.
Is there an open-source alternative to Datadog?: Yes: Grafana (AGPL-3.0), Prometheus (Apache-2.0), VictoriaMetrics (Apache-2.0), Beszel (OSS/MIT).

Datadog alternatives (2026)

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