Nagios XI

Best Self-hosted Alternatives to Nagios XI

A curated collection of the 2 best self hosted alternatives to Nagios XI.

Commercial monitoring and alerting platform for IT infrastructure. Monitors servers, network devices, services and applications via checks and plugins; provides dashboards, reporting, notifications, and extensibility for custom checks and integrations.

Alternatives List

#1
Netdata

Netdata

Open-source, agent-based monitoring platform delivering per-second metrics, edge ML anomaly detection, tiered time-series storage and centralized cloud UI.

Netdata screenshot

Netdata is an open-source, agent-based observability platform that collects, stores, and visualizes per-second metrics across infrastructure and applications. It combines a lightweight edge agent, a tiered time-series store, and optional centralized Cloud/Parent components for unified views and collaboration.

Key Features

  • Per-second, real-time metrics collection with millisecond responsiveness and auto-generated dashboards.
  • Edge-based machine learning: unsupervised anomaly detection and per-metric ML models running on the agent.
  • Tiered, high-efficiency time-series storage (compact samples, ZSTD compression) with configurable retention and archiving.
  • Distributed Parent–Child streaming pipeline for horizontal scaling, multi-node aggregation, and long-term retention.
  • Broad integrations (800+ collectors) and export/archival targets including Prometheus, InfluxDB, OpenTSDB, and Graphite.
  • Low resource footprint (designed for minimal CPU/RAM impact) and zero-configuration auto-discovery on supported platforms.

Use Cases

  • Infrastructure and system monitoring: per-second visibility into CPU, memory, disks, network, sensors, and kernel metrics.
  • Container and Kubernetes observability: native containerd/Docker and Kubernetes integrations for pod, node, and cluster troubleshooting.
  • Incident troubleshooting and AIOps: anomaly detection, root-cause analysis, blast-radius identification, and automated reporting to accelerate incident resolution.

Limitations and Considerations

  • The Netdata UI and Netdata Cloud components are delivered as closed-source offerings while the Agent is open-source; organizations requiring fully open-source stacks should evaluate this split.
  • OpenTelemetry support is noted as "coming soon" in documentation; users relying heavily on OpenTelemetry may need to plan integrations or use exporters.
  • Feature parity varies by platform (Linux has the most comprehensive coverage); some platform-specific collectors or deep kernel metrics are not available everywhere.

Netdata offers a high-resolution, low-overhead approach to full-stack monitoring with built-in ML and flexible scaling via Parents and Netdata Cloud. It is well-suited for teams needing real-time troubleshooting, container/Kubernetes visibility, and efficient time-series retention while weighing the tradeoffs of closed-source UI/cloud components.

77.9kstars
6.4kforks
#2
Nutify

Nutify

Modern web UI for monitoring NUT-compatible UPS devices with real-time charts, historical reporting, and multi-channel alerts. Docker-ready with client/server modes.

Nutify is a web-based monitoring system for Uninterruptible Power Supply (UPS) devices built around Network UPS Tools (NUT). It collects UPS metrics, visualizes real-time and historical data, and helps you track battery health, power events, and overall device status from a centralized dashboard.

Key Features

  • Real-time UPS monitoring with interactive data visualization
  • Historical data persistence and reporting (including scheduled/automated reports)
  • Multi-user authentication with granular permissions for pages and configuration
  • Web-based setup wizard for configuring UPS connection and NUT settings
  • Flexible deployment modes: run as a NUT server or connect as a lightweight client to a remote NUT server
  • Alerting and notifications via email, ntfy, webhooks, and Discord
  • Event logging, UPS command execution (with permission control), and connection recovery
  • Docker and Docker Compose deployment with multi-architecture images

Use Cases

  • Monitor a homelab or small office UPS and receive alerts on power and battery events
  • Centralize visibility for multiple systems by connecting to an existing NUT server
  • Generate periodic reports on UPS performance and energy/battery behavior for planning and maintenance

Limitations and Considerations

  • Compatibility depends on NUT driver support and correct USB/network access from the host/container
  • Some deployments may require elevated container privileges and device passthrough for USB-connected UPS devices

Nutify is well-suited for operators who want a modern UI on top of NUT, combining real-time dashboards, historical reporting, and configurable alerting. Its setup wizard and Docker-based deployment make it approachable while still supporting advanced configurations and multi-user access control.

684stars
26forks

Why choose an open source alternative?

  • Data ownership: Keep your data on your own servers
  • No vendor lock-in: Freedom to switch or modify at any time
  • Cost savings: Reduce or eliminate subscription fees
  • Transparency: Audit the code and know exactly what's running