Comparison

The OpenNMS Group, Inc. vs Datadog

The OpenNMS Group, Inc. and Datadog both land on Depends.

The OpenNMS Group, Inc.

Depends

Confidence: Medium

Built for enterprises running large, distributed networks with dedicated ops staff . the free Horizon edition makes it worth piloting at that scale.

Depends

Confidence: High

Buy it if you run a mid-to-large engineering org with complex infrastructure and budget for usage-based bills.

The OpenNMS Group, Inc. versus Datadog
Compare	The OpenNMS Group, Inc.	Datadog
Verdict	Depends	Depends
Best for	Large distributed networks	Mid-to-large engineering orgs
Who it's not for	Small businesses with a handful of devices	Small teams or side projects on a budget
Privacy	Actively maintained: Meridian undergoes penetration testing, but a past code-execution vulnerability required immediate upgrade.^⁸	No confirmed platform breach in reviewed sources; agent components carry published CVEs and a 2016 incident is documented.
Support quality	Horizon is community-only; paid support via Meridian	No support evidence in reviewed sources
Public sentiment	No substantive user review scores surfaced; Reddit and directory coverage centers on release announcements rather than buyer opinions.¹⁰	Users praise the unified visibility and integration depth, but cost is the loudest complaint across Reddit and review sites.¹¹
Biggest gotcha	A past vulnerability allowed local and remote code execution and demanded immediate upgrades^⁸	Multi-dimensional billing: hosts, logs, APM, synthetics each metered separately¹⁵