shouldiuse.io

VERDICT

Should I use The OpenNMS Group, Inc.?

OpenNMS is an enterprise-grade network monitoring platform that can be deployed anywhere. Companies in the Fortune 100 use it every day. - opennms.com

Depends. Built for enterprises running large, distributed networks with dedicated ops staff — the free Horizon edition makes it worth piloting at that scale. Small teams or anyone wanting quick, hosted monitoring should pick a simpler tool.

Confidence

Medium. Based on 14+ public sources; no quantified user review ratings or published pricing found.

Ratings

  • Value for money
  • Ease of use
  • Feature depth
  • Support quality
  • Security posture

Pricing

Free

Horizon

ModelNot disclosed
Monthly feesNot disclosed
HardwareNot disclosed
Free tierYes
MeridianNot published (subscription)

Best for

  • Large distributed networks
  • Enterprises with dedicated network ops teams
  • Fortune 100-scale infrastructure
  • Teams avoiding vendor lock-in

Not for

  • Small businesses with a handful of devices
  • Teams without dedicated network admins
  • Anyone wanting plug-and-play hosted monitoring
  • Non-technical users needing fast dashboards

Gotchas - check before you buy

high

A past vulnerability allowed local and remote code execution and demanded immediate upgrades

medium

Horizon is free but community-supported only; real support means a Meridian subscription

medium

No public pricing in sources reviewed; Meridian is likely sales-led negotiation

low

Multiple parallel editions and branch versions (Horizon vs Meridian) complicate upgrade planning

Pros and cons

Pros

  • Enterprise-grade, monitors some of the largest networks across many sectors
  • Free, open-source Horizon edition with 20+ years of development
  • Distributed monitoring via Minion appliance for remote sites
  • Vendor-neutral open-source platform with large active community
  • Meridian gets ongoing penetration testing and regular security releases

Cons

  • Complex configuration via web UI or XML scripting
  • Free Horizon edition relies on community support only
  • Serious flaws have required immediate upgrades
  • Enterprise focus under NantHealth; not small-business oriented

Sources & method

Analyzed 9/20/2026 - 10 sources - Actively maintained: Meridian undergoes penetration testing, but a past code-execution vulnerability required immediate upgrade.

official x3review x3security x2news x2
  • Local and remote code execution vulnerability (fixed), OpenNMS disclosed a security vulnerability allowing local and remote code execution and urged users to upgrade immediately.

Key stats

  • Value for money: 4/5

    Rating

  • Free

    Starting price

  • 10

    Sources

  • Analyzed

  • Value for money: 4/5. Free Horizon edition; paid Meridian subscription
  • Ease of use: 2/5. Guess: XML scripting and web UI config, complex
  • Feature depth: 5/5. Enterprise-grade: flows, distributed Minion, huge scale
  • Support quality: 3/5. Horizon is community-only; paid support via Meridian
  • Security posture: 3/5. Active pentesting, but code-exec flaw required urgent upgrade
  • 2004 Founded PrivCo company profile
  • Yes Free tier Horizon community edition
  • 20+ years Open source age Community-driven development
  • NantHealth (NASDAQ: NH) Parent company Acquired as subsidiary

Pricing

Horizon

Free

  • Open source, community edition
  • Community support only
  • Frequent feature releases

Meridian

Not published (subscription)

  • Commercially supported subscription
  • Stable long-term releases
  • Security and enterprise support

Security

Actively maintained: Meridian undergoes penetration testing, but a past code-execution vulnerability required immediate upgrade.

  • Local and remote code execution vulnerability (fixed)OpenNMS disclosed a security vulnerability allowing local and remote code execution and urged users to upgrade immediately.⁸

What users say

No substantive user review scores surfaced; Reddit and directory coverage centers on release announcements rather than buyer opinions.

Full analysis

Based on 14+ public sources; no quantified user review ratings or published pricing found.

Enterprise open-source network monitoring: powerful and free to start, but overkill for small teams — needs real ops expertise.

Methodology

Based on 14+ public sources; no quantified user review ratings or published pricing found.

Sources

  1. NantHealth Acquires OpenNMStechnologynetworks.com
    news
  2. OpenNMS Group company profilesystem.privco.com
    official
  3. OpenNMS: Monitoring Your Network's Heartbeatnanthealth.com
    official
  4. The OpenNMS Group Releases OpenNMS Meridian 2022nanthealth.com
    security
  5. OpenNMS Minion Appliance announcementbusinesswire.com
    news
  6. OpenNMS open-source overviewmedevel.com
    review
  7. AlternativeTo listingalternativeto.net
    review
  8. OpenNMS security issue requires immediate upgradeopennms.com
    security
  9. OpenNMS community support FAQopennms.com
    official
  10. Reddit opennms.com domain activityreddit.com
    review

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