OpenTools

Open source Monitoring & error tracking

Zabbix

100 · Healthy

Enterprise monitoring for networks, servers, VMs and applications, with templates, triggers and escalations.

Free, share hosted changesAGPL-3.0Relicensed 2024★ 6.5kLast commit 2 days ago

Prometheus

97 · Healthy

Metrics collection and time series database with its own query language (PromQL) and alerting rules.

Free to useApache-2.0★ 66kLast commit yesterday

OpenObserve

94 · Healthy

Observability platform for logs, metrics, traces and real user monitoring, built for low storage costs.

Free, share hosted changesAGPL-3.0Relicensed 2023★ 22kLast commit yesterday

SigNoz

92 · Healthy

OpenTelemetry-native observability with logs, metrics and traces in one app.

Free core, paid extrasMIT★ 32kLast commit yesterday

Keep

92 · Healthy

Alert management that pulls in alerts from your monitoring tools, deduplicates and correlates them, and runs workflows.

Free core, paid extrasMIT★ 12kLast commit 12 days ago

HyperDX

91 · Healthy

Observability on ClickHouse that links session replays, logs, metrics, traces and errors in one search.

Free to useMIT★ 9.9kLast commit yesterday

Grafana

90 · Healthy

Dashboards and alerting over metrics, logs and traces from Prometheus, Loki, SQL databases and many other sources.

Free, share hosted changesAGPL-3.0Relicensed 2021★ 77kLast commit yesterday

Loki

90 · Healthy

Log aggregation that indexes labels rather than full text to keep storage cheap, queried from Grafana.

Free, share hosted changesAGPL-3.0Relicensed 2021★ 29kLast commit yesterday

openstatus

88 · Healthy

Status pages and uptime monitoring from several regions, with incident updates and alerting.

Free, share hosted changesAGPL-3.0★ 9.2kLast commit yesterday

Gatus

87 · Healthy

Health checks for HTTP, TCP, DNS and more, configured in YAML, with alerts and a status page.

Free to useApache-2.0★ 12kLast commit 2 days ago

Netdata

86 · Healthy

Per-second infrastructure monitoring agent with auto-discovered metrics, dashboards and anomaly detection.

Free core, paid extrasGPL-3.0★ 81kLast commit yesterday

Uptime Kuma

83 · Healthy

Uptime monitor for HTTP, TCP, DNS and more, with status pages and many notification channels.

Free to useMIT★ 92kLast commit 2 days ago

Apache SkyWalking

78 · Stable

Application performance monitoring with distributed tracing, service maps and metrics for microservices.

Free to useApache-2.0★ 25kLast commit yesterday

OneUptime

72 · Stable

All-in-one platform for uptime checks, status pages, on-call, incidents, logs and APM.

Free core, paid extrasApache-2.0★ 7.7kLast commit yesterday

Checkmate

70 · Stable

Uptime, response time and server hardware monitoring, with incidents and status pages.

Free, share hosted changesAGPL-3.0★ 11kLast commit yesterday

Healthchecks

69 · Stable

Cron job and background task monitoring that alerts you when expected pings stop arriving.

Free to useBSD-3-Clause★ 10kLast commit 4 days ago

Kener

69 · Stable

Status page with built-in monitors, incident history and a polished public page.

Free to useMIT★ 5.2kLast commit 2 days ago

LogTide

66 · Stable

Log management with search, alerts and dashboards, designed to be light to run and privacy-friendly.

Free, share hosted changesAGPL-3.0★ 457Last commit 2 months ago

Coroot

65 · Stable

eBPF-based observability that collects metrics, logs, traces and profiles without code changes and suggests root causes.

Free to useApache-2.0★ 8.0kLast commit 3 days ago

Uptrace

65 · Stable

OpenTelemetry APM for traces, metrics and logs, stored in ClickHouse.

Free, share hosted changesAGPL-3.0★ 4.3kLast commit 2 days ago

Source-available and unverified licenses

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.

Free, no resellingFunctional Source License 1.1Relicensed 2023★ 46kLast commit yesterday

Bugsink

64 · Stable

Error tracking that accepts events from Sentry SDKs and runs on a single small server.

Free, no resellingPolyForm Shield 1.0.0★ 2.1kLast commit 2 days ago

Cachet

60 · Stable

Status page system for publishing component status, incidents and scheduled maintenance.

Free with conditionsCachet License★ 15kLast commit 4 days ago

Prometheus

Metrics collection and time series database with its own query language (PromQL) and alerting rules.

Alternative to

Will it still be around?

Healthy

Score 97/100

Details

Can a business use it freely?

Free to use

Apache-2.0 · open source (permissive)

Details
Prometheus screenshot 1

Features compared

has,doesn't7 features

4/12 Datadog features free in Prometheus

✕ doesn't have it · ◐ partly · $ higher plan or paid editionBoth have 4

Headline Datadog features on the Infrastructure Pro + APM plan, and whether Prometheus has each in its free, self-hosted edition.

Datadog and Prometheus, feature by feature
FeatureDatadogInfrastructure Pro + APM planPrometheus4 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

Compare every Datadog alternative

Flat Rate Deploy

Monthly cost

Prometheus on OpenTools
$39
Datadog
$1,150

You save each month

$1,111/mo

97% less than today

Saving from month one

You save

Over 3 years
$39,996
In year one
$13,332

List price checked 7 Oct 2026 · Source · Disclaimer

Health score: 97/100

Healthy · activity, bus factor and issue responsiveness, from GitHub

Score v2 · How it works

Activity

45% weight

100/100

  • Last commit yesterday (100/100).
  • 2596 commits in the past 12 months (100/100).
  • 37 releases in the past 12 months (100/100).

Bus factor

30% weight

99/100

  • Top contributor wrote 26% of the last 93 commits (past 12 months).
  • 23 people authored those commits.

Responsiveness

25% weight

90/100

  • 93% of all issues are closed (493 open, 6088 closed) (100/100).
  • 25 of 30 recent issues got a reply or were closed (83/100).

License

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.

GitHub activity

Stars
66k
Forks
11k
Commits, 12 mo
2.6k
last yesterday
Releases, 12 mo
37
last 7 days ago
Contributors
351
23 in last 93 commits
Open issues
493
6.1k closed

Snapshot from 2026-10-09

Top contributors

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.

  1. 1232 points
  2. 2183 points
  3. 3134 points
  4. 490 points
  5. 570 points
  6. 646 points
  7. 743 points
  8. 836 points
  9. 930 points
  10. 1030 points
Bespoke · we set it up$3,000onceFlat Rate Deploy$39/mo