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Cacti vs Observium: catalog facts
Cacti	Observium
Free Free and open source under the GPL.	Freemium A free community edition is available. Professional and Enterprise editions are paid.
Linux, Web, Self-hosted	Linux, Web, Self-hosted
RRDtool storage keeps years of graphs in a fixed amount of disk Mature template and plugin ecosystem for network devices	Autodiscovery means devices appear with graphs and inventory automatically Clean interface that stays readable with many devices
Interface and workflow feel dated next to newer monitoring stacks Alerting requires plugins rather than being built in	The community edition receives releases far less often than the paid one Alerting and some features are in the subscription edition
Self-hosted	Self-hosted
Open source	Closed source
License: GPL-2.0	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.