Side by side
Down Device vs OpenNMS
Both stand on dns monitoring software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan Web
Down Device covers several monitoring types, with plan limits for devices, intervals and data retention. Check whether the Free plan’s HTTP and ping checks meet your needs before moving to a paid tier.
Visit Down Device Free plan APILinuxSelf-hosted+1
OpenNMS covers network monitoring across local and remote environments, with Horizon and Meridian serving different release and subscription needs. Consider Horizon’s production-readiness caveat and Meridian’s per-instance subscription limits when selecting a distribution.
Visit OpenNMSThe facts
| Down Device | OpenNMS | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | Web | API, Linux, Self-hosted, Web |
| Lowest paid plan | Basic: $9 a month | Basic: $6,000 a year |
| Plans published | 4 | 6 |
| Maker | Not published | Not published |
| Website | downdevice.com | opennms.com |
| On dns monitoring software | #18 of 37 | #14 of 37 |
Down Device: what it does well
- Monitors from multiple locations.
- API checks support headers and content validation.
- SSL expiry alerts are scheduled at 30, 14 and 7 days.
- DNS monitoring tracks record changes.
- Team roles and permissions are customizable.
What to know first
- The Free plan excludes API, SNMP and port monitoring.
- Free checks run every 5 minutes.
- Basic retention is 30 days.
OpenNMS: what it does well
- Horizon community distribution is free
- Monitors remote devices through Minions
- Supports multiple traffic-flow formats
- Grafana plugin displays alarms, outages, and KPIs
What to know first
- Horizon features may not be production-ready
- 24/7 emergency support costs extra
- Support plans exclude several third-party products
- Meridian subscriptions are limited per instance
Alternatives to Down Device Alternatives to OpenNMS The whole list