Zabbix
100 · HealthyEnterprise monitoring for networks, servers, VMs and applications, with templates, triggers and escalations.
Enterprise monitoring for networks, servers, VMs and applications, with templates, triggers and escalations.
Metrics collection and time series database with its own query language (PromQL) and alerting rules.
Observability platform for logs, metrics, traces and real user monitoring, built for low storage costs.
OpenTelemetry-native observability with logs, metrics and traces in one app.
Alert management that pulls in alerts from your monitoring tools, deduplicates and correlates them, and runs workflows.
Observability on ClickHouse that links session replays, logs, metrics, traces and errors in one search.
Dashboards and alerting over metrics, logs and traces from Prometheus, Loki, SQL databases and many other sources.
Log aggregation that indexes labels rather than full text to keep storage cheap, queried from Grafana.
Status pages and uptime monitoring from several regions, with incident updates and alerting.
Health checks for HTTP, TCP, DNS and more, configured in YAML, with alerts and a status page.
Per-second infrastructure monitoring agent with auto-discovered metrics, dashboards and anomaly detection.
Uptime monitor for HTTP, TCP, DNS and more, with status pages and many notification channels.
Application performance monitoring with distributed tracing, service maps and metrics for microservices.
All-in-one platform for uptime checks, status pages, on-call, incidents, logs and APM.
Uptime, response time and server hardware monitoring, with incidents and status pages.
Cron job and background task monitoring that alerts you when expected pings stop arriving.
Status page with built-in monitors, incident history and a polished public page.
Log management with search, alerts and dashboards, designed to be light to run and privacy-friendly.
eBPF-based observability that collects metrics, logs, traces and profiles without code changes and suggests root causes.
OpenTelemetry APM for traces, metrics and logs, stored in ClickHouse.
The code for these is public, but the license is not an OSI open source license, or we have not verified it yet. Check the license notes on each project before relying on it.
Error tracking and performance monitoring; the same code as Sentry's hosted service.
Error tracking that accepts events from Sentry SDKs and runs on a single small server.
Status page system for publishing component status, incidents and scheduled maintenance.
Metrics collection and time series database with its own query language (PromQL) and alerting rules.
Will it still be around?
Healthy
Score 97/100
Can a business use it freely?
Free to use
Apache-2.0 · open source (permissive)

has,doesn't7 features
4/12 Datadog features free in Prometheus
Datadog has every feature Prometheus has on this list.
Headline Datadog features on the Infrastructure Pro + APM plan, and whether Prometheus has each in its free, self-hosted edition.
| Feature | DatadogInfrastructure Pro + APM plan | Prometheus4 of 12 free |
|---|---|---|
| Datadog has, Prometheus doesn't7 | ||
| Dashboards | Included | PartlyBasic UI; pair with Grafana |
| APM and distributed tracing | Included | No |
| Log management | Higher planPriced separately | No |
| Error tracking | IncludedWith APM | No |
| Real user monitoring and session replay | Higher planPriced separately | No |
| Incident management and on-call | Higher planPriced separately | No |
| SAML single sign-on | Included | No |
| Both have4 | ||
| Infrastructure metrics | Included | Yes |
| Alerts and monitors | Included | YesAlertmanager |
| Prebuilt integrations | Included1,000+ integrations | YesExporters |
| OpenTelemetry support | Included | YesOTLP ingestion |
| Neither has fully1 | ||
| Uptime and synthetic checks | Higher planPriced separately | PartlyBlackbox exporter |
Sources
A 25-host team on Datadog Infrastructure Pro + APM pays about $1,150 a month. Prometheus on OpenTools costs $39 a month, setup included, so you save $1,111 a month, about $39,996 over three years.
Monthly cost
You save each month
$1,111/mo
97% less than today
Saving from month one
You save
List price checked 7 Oct 2026 · Source · Disclaimer
Healthy · activity, bus factor and issue responsiveness, from GitHub
Score v2 · How it works
100/100
99/100
90/100
Free to use
Apache-2.0 · Open source (permissive)
What you need to do
Use, change, host and sell it for any purpose, commercial included, with no license to buy. Keep the copyright notice.
Apache License 2.0 · Open source (permissive). OSI-approved license with few conditions beyond keeping the copyright notice.
Detected by GitHub as Apache-2.0.
Snapshot from 2026-10-09
Points for pull requests merged into Prometheus and reviews of them since 22 August 2026 (older history is still loading). Building something another user asked for earns more. 59 people have points on Prometheus in all.