1 Open Source Alternatives to Nagios

A list of 1 carefully selected open-source alternatives to Nagios.

Created by

Adrian

Mar 9, 2025Updated•2 min read

The open-source alternatives are ranked based on our custom ranking system and score. This system takes into account various factors to determine the best alternatives.

If you’re looking for alternative features or workflows, here is a prepared detailed list of Nagios open-source alternatives — each with its own distinctive strengths and key features.

Checkmk

1,687

479

Checkmk is a best-in-class IT monitoring platform that empowers IT operations and DevOps teams with a comprehensive, scalable, and automated solution for monitoring infrastructure and applications. It delivers out-of-the-box discovery and over 2,000 vendor-maintained plug-ins to ensure every component of your IT ecosystem is covered.

Key Features

High-performance scalable architecture capable of monitoring millions of services
Over 2,000 vendor-maintained plug-ins for diverse IT environments
Automated host discovery and configuration with auto-registration
Granular security controls including encryption, 2FA, and role-based permissions
Extensible platform with REST API for custom monitoring and integrations

Checkmk offers a powerful monitoring solution built on a high-performance core designed to scale up to millions of services. The platform automates host discovery, configuration, and agent management using a modern REST API, reducing manual work and ensuring real-time insights. With customizable dashboards, advanced analytics, and granular security controls including encryption and 2FA, it provides complete visibility into cloud, on-premise, and hybrid infrastructures while enabling rapid investigation and resolution of issues.

Learn more about Checkmk

Price comparison of Nagios open-source alternatives

Tool	Tier 1	Tier 2	Tier 3	Details
Checkmk	$0 Raw Edition	$175 Enterprise Edition	$250 Cloud Edition	Learn more

* Pricing shown is based on publicly available information and may not reflect current rates. Visit each tool's website for detailed pricing information and additional tiers.

About Nagios

Nagios Enterprises, located in St. Paul, Minnesota, is the leading provider of world-class products and services for IT monitoring and security. We are dedicated to helping companies with their IT infrastructure needs. As the official provider of Nagios®, the industry standard in enterprise-grade IT infrastructure monitoring, we deliver a comprehensive range of solutions to ensure total customer satisfaction. With millions of users worldwide, Nagios is the undisputed champion in the IT monitoring space. Our team of dedicated professionals works tirelessly to deliver official products, services, and solutions that meet a variety of business needs. We have an extensive network of partners that helps us extend our reach and cater to new organizations and markets around the world. Founded in 2007 by Ethan Galstad, Nagios Enterprises has established itself as a legend in the tech industry. Join our collaborative and committed team and be a part of our success story. Contact us today to experience the benefits of using Nagios firsthand.