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Checkmk vs PRTG Network Monitor: catalog facts
Checkmk	PRTG Network Monitor
Freemium Free open-source Raw edition, with paid Enterprise and Cloud editions.	Freemium Free for up to one hundred sensors. Larger deployments require a paid licence.
Self-hosted	Windows, Web, Self-hosted
Auto-discovery reduces manual setup for new hosts and services Supports both agent-based and agentless SNMP monitoring	One hundred sensors free forever, which covers a small network Autodiscovery, maps and alerting configured through one interface
Advanced features and scaling are gated behind paid commercial editions Self-hosted setup and tuning takes more effort than a hosted SaaS monitor	Licensing is per sensor and gets expensive quickly Windows server only, closed source
Self-hosted, Downloadable app	Self-hosted
Open source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.