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ManageEngine OpManager vs Cacti: catalog facts
ManageEngine OpManager	Cacti
Freemium Free edition for a limited number of devices, with paid tiers for larger networks.	Free Free and open source under the GPL.
Self-hosted	Linux, Web, Self-hosted
Covers fault, performance and configuration management in one console Free tier makes it accessible for monitoring smaller networks	RRDtool storage keeps years of graphs in a fixed amount of disk Mature template and plugin ecosystem for network devices
Larger networks require paid tiers to unlock full device and feature limits Proprietary software, so you cannot inspect or modify the underlying code	Interface and workflow feel dated next to newer monitoring stacks Alerting requires plugins rather than being built in
Self-hosted, Downloadable app	Self-hosted
Closed source	Open source
License not stated	License: GPL-2.0
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.