Last updated: April 12, 2026
Prometheus vs Datadog — Open Source vs Managed Monitoring in 2026
Quick Answer
Prometheus is a free, open-source metrics system with PromQL and a pull-based model. Datadog is a managed SaaS observability platform with metrics, logs, traces, and dashboards. Prometheus is cheaper but requires self-management; Datadog is turnkey but expensive.
Prometheus vs Datadog — Side by Side
| Feature | Prometheus | Datadog |
|---|---|---|
| Cost | Free (self-hosted), pay for infra | Expensive — $15-23/host/month + add-ons |
| Hosting | Self-managed or Grafana Cloud | Fully managed SaaS |
| Metrics | PromQL — powerful time-series queries | Custom query language + PromQL support |
| Logs | Not included (use Loki) | Built-in log management |
| Traces | Not included (use Jaeger/Tempo) | Built-in APM/tracing |
| Dashboards | Grafana (separate) | Built-in dashboards |
| Alerting | Alertmanager (separate) | Built-in alerting |
Verdict
Choose Prometheus + Grafana for cost-effective monitoring when you have the team to manage it. Choose Datadog when you want an all-in-one platform and budget is not the primary concern. Grafana Cloud is a managed middle ground.
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