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

Loki

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

Alternative to

Will it still be around?

Healthy

Score 90/100

Details

Can a business use it freely?

Free, share hosted changes

AGPL-3.0 · open source (copyleft) · relicensed stricter in 2021

Details
Loki screenshot 1

Features compared

has,doesn't5 features

3/8 Datadog features free in Loki

✕ doesn't have it · ◐ partly · $ higher plan or paid editionBoth have 2

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

Datadog and Loki, feature by feature
FeatureDatadogInfrastructure Pro + APM planLoki3 of 8 free
Datadog has, Loki doesn't5
Infrastructure metrics Included No
Dashboards Included PartlyThrough Grafana
APM and distributed tracing Included No
Real user monitoring and session replay Higher planPriced separately No
Uptime and synthetic checks Higher planPriced separately No
Loki has, Datadog doesn't1
Log management Higher planPriced separately Yes
Both have2
Alerts and monitors Included YesRuler
OpenTelemetry support Included YesOTLP logs

Sources

Compare every Datadog alternative

Flat Rate Deploy

Monthly cost

Loki on OpenTools
$39
Splunk
$1,500

You save each month

$1,461/mo

97% less than today

Saving from month one

You save

Over 3 years
$52,596
In year one
$17,532

List price checked 9 Oct 2026 · Source · Disclaimer

Health score: 90/100

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

Score v2 · How it works

Activity

45% weight

100/100

  • Last commit yesterday (100/100).
  • 3108 commits in the past 12 months (100/100).
  • 41 releases in the past 12 months (100/100).

Bus factor

30% weight

87/100

  • Top contributor wrote 34% of the last 58 commits (past 12 months).
  • 16 people authored those commits.

Responsiveness

25% weight

75/100

  • 89% of all issues are closed (626 open, 5191 closed) (99/100).
  • 18 of 30 recent issues got a reply or were closed (60/100).

License

Free, share hosted changes

AGPL-3.0 · Open source (copyleft)Relicensed 2021

What you need to do

Free for any use, commercial included. If you change the code and people outside your company use it over the network, you must publish your changes under the same license.

GNU Affero General Public License v3.0 · Open source (copyleft). OSI-approved license that requires sharing changes under the same license when you distribute (AGPL: also when you offer it over a network).

Detected by GitHub as AGPL-3.0.

License history

  1. Apache-2.0 → AGPL-3.0 · Moved from Apache-2.0 to AGPL-3.0 with Grafana. · commit

GitHub activity

Stars
29k
Forks
4.1k
Commits, 12 mo
3.1k
last yesterday
Releases, 12 mo
41
last 2 days ago
Contributors
447
16 in last 58 commits
Open issues
626
5.2k closed

Snapshot from 2026-10-09

Top contributors

Points for pull requests merged into Loki and reviews of them since 25 September 2026 (older history is still loading). Building something another user asked for earns more. 25 people have points on Loki in all.

  1. 1339 points
  2. 2217 points
  3. 3157 points
  4. 489 points
  5. 563 points
  6. 656 points
  7. 747 points
  8. 843 points
  9. 933 points
  10. 1032 points
Bespoke · we set it up$3,000onceFlat Rate Deploy$39/mo