243 tools · 140 open-source · 103 SaaS
The best monitoring & observability tools. Ranked by real activity.
The top-ranked open-source monitoring & observability tool on Enlisted is Uptime Kuma (92k GitHub stars), followed by Netdata and Grafana. Among SaaS products, other tools on Enlisted are most often compared with Datadog, Dynatrace and Splunk.
Enlisted lists 243 monitoring & observability tools: 140 open source and 103 SaaS. 119 of the open-source ones can be self-hosted on your own server or computer. The most common open-source licences here are Apache-2.0 (50 tools), MIT (37) and AGPL-3.0 (10). The open-source ones are most often listed as alternatives to Datadog, New Relic and UptimeRobot.
Last updated October 3, 2026 · ranked by GitHub stars, growth and recent commits
The top 48 of 243 monitoring & observability tools
Uptime Kuma
Monitoring & Observability
A self-hosted monitoring tool
MITvs UptimeRobot★ 92k
Netdata
Monitoring & Observability
The fastest path to AI-powered full stack observability, even for lean teams.
GPL-3.0vs Datadog★ 81k
Grafana
Monitoring & Observability
The open and composable observability and data visualization platform. Visualize metrics,
AGPL-3.0vs Datadog★ 77k
Prometheus
Monitoring & Observability
The Prometheus monitoring system and time series database.
Apache-2.0vs Datadog★ 66k
Sentry
Monitoring & Observability
Developer-first error tracking and performance monitoring
OSSvs Rollbar★ 45k
Langfuse
AI Infrastructure
Trace, evaluate, and improve AI agents with one open platform. Use production data to unde
OSSvs Weights & Biases★ 35k
Changedetection.io
Monitoring & Observability
Best and simplest way to monitor websites for changes, change detection, website checker,
Apache-2.0★ 35kGlances
Monitoring & Observability
Glances an Eye on your system. A top/htop alternative for GNU/Linux, BSD, macOS and Window
OSS★ 34k
SigNoz
Monitoring & Observability
SigNoz Cloud is a one-stop observability tool built on top of OpenTelemetry. Get APM, logs
OSSvs Datadog★ 32k
Grafana Loki
Monitoring & Observability
Like Prometheus, but for logs.
AGPL-3.0vs Datadog★ 29k
Beszel
Monitoring & Observability
Lightweight server monitoring with historical data, Docker stats, and alerts.
MIT★ 26k
Jaeger
Monitoring & Observability
CNCF Jaeger, a Distributed Tracing Platform
Apache-2.0vs Datadog★ 23k
Vector
Monitoring & Observability
A high-performance observability data pipeline.
MPL-2.0vs Cribl★ 23k
OpenObserve
Monitoring & Observability
High-performance, unified observability for the AI era. 140x lower storage cost.
AGPL-3.0vs Datadog★ 22k
Opik
AI Infrastructure
Debug, evaluate, and monitor your LLM applications, RAG systems, and agentic workflows wit
Apache-2.0vs Weights & Biases★ 22k
Kibana
Monitoring & Observability
Your window into all of your data
OSSvs Splunk★ 21k
cAdvisor
Monitoring & Observability
Analyzes resource usage and performance characteristics of running containers.
OSS★ 19k
Telegraf
Monitoring & Observability
Agent for collecting, processing, aggregating, and writing metrics, logs, and other arbitr
MITvs Cribl★ 18k
VictoriaMetrics
Monitoring & Observability
VictoriaMetrics: fast, cost-effective monitoring solution and time series database
Apache-2.0vs Datadog★ 18k
Upptime
Monitoring & Observability
⬆️ GitHub Actions uptime monitor & status page by @AnandChowdhary
MITvs UptimeRobot★ 17k
System Informer
Monitoring & Observability
A free, powerful, multi-purpose tool that helps you monitor system resources, debug softwa
MIT★ 16k
Cachet
Monitoring & Observability
From startups to Fortune 500 companies, organizations worldwide trust Cachet to streamline
OSSvs Instatus★ 15k
Logstash
Data Pipelines & ETL
Logstash - transport and process your logs, events, or other data
OSSvs Cribl★ 15k
Dozzle
Monitoring & Observability
Realtime log viewer for containers. Supports Docker, Swarm and K8s.
MIT★ 15kBottom
Monitoring & Observability
Yet another cross-platform graphical process/system monitor.
MIT★ 14k
Thanos
Monitoring & Observability
Highly available Prometheus setup with long term storage capabilities. A CNCF Incubating p
Apache-2.0★ 14k
Pinpoint
Monitoring & Observability
APM, (Application Performance Management) tool for large-scale distributed systems.
Apache-2.0vs Dynatrace★ 14k
Nightingale
Monitoring & Observability
Nightingale is to monitoring and alerting what Grafana is to visualization.
Apache-2.0★ 13k
Gatus
Monitoring & Observability
Create beautiful, automated status pages with advanced monitoring. Track HTTP, DNS, TCP en
Apache-2.0vs UptimeRobot★ 12k
Keep
Monitoring & Observability
The open-source AIOps and alert management platform
OSSvs BigPanda★ 12k
Arize Phoenix
AI Infrastructure
AI Observability & Evaluation
OSSvs Weights & Biases★ 12k
Pyroscope
Monitoring & Observability
Continuous Profiling Platform. Debug performance issues down to a single line of code
AGPL-3.0vs Datadog★ 12k
Quickwit
Monitoring & Observability
Cloud-native OSS search engine for observability
Apache-2.0vs Datadog★ 12k
Checkmate
Monitoring & Observability
Checkmate is an open-source, self-hosted tool designed to track and monitor server hardwar
AGPL-3.0vs UptimeRobot★ 11k
Spug
CI/CD & DevOps
Spug is a lightweight agent-free automatic operation and maintenance platform designed for
AGPL-3.0vs AWS CodeDeploy★ 11k
Healthchecks
Monitoring & Observability
Open-source cron job and background task monitoring service, written in Python & Django
BSD-3-Clausevs Cronitor★ 10k
Nezha
Monitoring & Observability
:trollface: Self-hosted, lightweight server and website monitoring and O&M tool
Apache-2.0vs UptimeRobot★ 10k
HyperDX
Monitoring & Observability
Resolve production issues, fast. An open source observability platform unifying session re
MITvs Datadog★ 9.9k
Prometheus Operator
Monitoring & Observability
Prometheus Operator creates/configures/manages Prometheus clusters atop Kubernetes
Apache-2.0★ 10k
Sentry
Monitoring & Observability
How you can run all of Sentry on your own server, without paying anything.
OSSvs Sentry★ 9.6k
Highlight.io
Monitoring & Observability
Highlight gives your team full transparency into the errors, interactions, and performance
OSSvs Sentry★ 9.4kMangoHud
Monitoring & Observability
A Vulkan and OpenGL overlay for monitoring FPS, temperatures, CPU/GPU load and more.
MIT★ 9.1k
OpenStatus
Monitoring & Observability
🫖 Status page with uptime monitoring & API monitoring as code 🫖
AGPL-3.0vs Pingdom★ 9.2k
Alertmanager
Monitoring & Observability
Prometheus Alertmanager
Apache-2.0vs xMatters★ 8.6kScrutiny
Monitoring & Observability
Hard Drive S.M.A.R.T Monitoring, Historical Trends & Real World Failure Thresholds
MIT★ 8.3k
Graylog
Monitoring & Observability
Free and open log management
OSSvs Splunk★ 8.2k
Coroot
Monitoring & Observability
Coroot is an open-source observability and APM tool with AI-powered Root Cause Analysis. I
Apache-2.0vs Datadog★ 7.9k
OneUptime
Monitoring & Observability
Complete open-source monitoring and observability platform.
OSSvs Datadog★ 7.7k
Monitoring & observability tools: questions
- What is the best open-source monitoring & observability tool?
- Uptime Kuma is the top-ranked open-source monitoring & observability tool on Enlisted, with 92k GitHub stars. It is followed by Netdata, Grafana and Prometheus.
- What are the best free monitoring & observability tools?
- The top-ranked open-source monitoring & observability tools with a standard licence are Uptime Kuma (MIT), Netdata (GPL-3.0) and Grafana (AGPL-3.0), so their code is free to use. 53 of the 103 SaaS products here have a free plan, including UptimeRobot, Better Stack and Sentry.
- Which monitoring & observability tools can be self-hosted?
- 119 of the 140 open-source monitoring & observability tools on Enlisted can be self-hosted on your own server or computer; the top-ranked are Uptime Kuma, Netdata and Grafana.
- How are these monitoring & observability tools ranked?
- Open-source tools are ordered by a score built from GitHub stars, star growth over the last 30 days and how recently the code changed; 108 of the 140 had new commits or a release in the last 30 days. SaaS products have no public repository, so they get a fixed baseline score. GitHub data is refreshed daily, and nobody can pay to move up.