[opensourcedex]

best-of ranking · updated nightly

Best Open Source Monitoring & Observability Tools

Ranked by GitHub stars — actual adoption, not editorial taste. All 10 are free, open source and self-hostable; license and last activity on every entry.

  1. 1
    Uptime Kuma ★ 91K

    Self-hosted uptime monitoring with a clean dashboard

    MIT JavaScript pushed 2026-09-17 details →
  2. 2
    worldmonitor ★ 87K

    Real-time global intelligence dashboard. AI-powered news aggregation, geopolitical monitoring, and infrastructure tracking in a unified situational awareness in

    AGPL-3.0 TypeScript pushed 2026-09-17 details →
  3. 3
    NetData ★ 81K

    Real-time monitoring for systems and applications

    GPL-3.0 Go pushed 2026-09-17 details →
  4. 4
    Grafana ★ 77K

    Unified observability for metrics, logs, traces, and more

    AGPL-3.0 TypeScript pushed 2026-09-17 details →
  5. 5
    huginn ★ 50K

    Create agents that monitor and act on your behalf. Your agents are standing by!

    MIT Ruby pushed 2026-09-16 details →
  6. 6
    Sentry ★ 45K

    Real-time error tracking and performance monitoring

    NOASSERTION Python pushed 2026-09-17 details →
  7. 7
    SigNoz ★ 32K

    Open-source observability platform for cloud-native apps

    NOASSERTION TypeScript pushed 2026-09-17 details →
  8. 8
    Grafana Loki ★ 29K

    Cost-effective log aggregation that indexes labels, not full text

    AGPL-3.0 Go pushed 2026-09-17 details →
  9. 9
    beszel ★ 25K

    Lightweight server monitoring with historical data, docker stats, and alerts.

    MIT Go pushed 2026-09-17 details →
  10. 10
    cilium ★ 25K

    eBPF-based Networking, Security, and Observability

    Apache-2.0 Go pushed 2026-09-17 details →
method stars desc · snapshot from github api refresh nightly related Backup & Recovery, Search Engines, Server & VM Management, Cloud Infrastructure Management, Storage Solutions, Orchestration & Scheduling

Related best-of lists

best Backup & Recovery →best Search Engines →best Server & VM Management →best Cloud Infrastructure Management →best Storage Solutions →best Orchestration & Scheduling →

last updated nightly · ranking method: github stars, live-tracked

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Frequently asked questions

What is the best open source Monitoring & Observability tool in 2026?

Uptime Kuma leads the ranking with 91,477 GitHub stars, ahead of worldmonitor. Rankings use live GitHub star counts, refreshed nightly.

How is this list of Monitoring & Observability tools ranked?

By GitHub stars — a proxy for adoption and community size. Each entry also shows its licence, primary language and last commit date, so you can judge maintenance activity rather than trusting the ranking alone.

Are the best Monitoring & Observability tools free?

Every project on this list is open source and free to self-host. Some also offer paid managed hosting, but the software itself carries no licence fee.