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Nagios Core vs Zabbix: catalog facts
Nagios Core	Zabbix
Free Free and open source. Hosting, hardware and any external services are separate.	Free Free and open source under the AGPL. Support and services are paid.
Self-hosted	Linux, Web, Self-hosted
Runs plugin-based checks Tracks availability and sends notifications	Scales to tens of thousands of monitored devices with proxies Large template library covering common hardware and services
Configuration and many checks need manual setup or additional plugins.	Configuration is extensive; the learning curve is real Interface density makes simple setups feel heavy
Self-hosted	Self-hosted
Open source	Open source
License: GPL-2.0	License: AGPL-3.0
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.