compare
Icinga vs Nagios Core
The same facts for both, read from GitHub every night, and the relation a person reviewed.
| Fact | Icinga | Nagios Core |
|---|---|---|
| Language | C++ | C |
| Licence | GPL-3.0 | GPL-2.0 |
| Stars | 2.2k | 2k |
| Latest | v2.16.5 | nagios-4.5.14 |
| Last push | 2026-10-06 | 2026-08-07 |
| Release cadence | about 7 days between releases | about 69 days between releases |
| Active contributors | 7 commit authors on the default branch in the last 90 days | 2 commit authors on the default branch in the last 90 days |
| Flags | none | none |
How they relate
Both replace PRTG Network Monitor. Alternatives to PRTG Network Monitor →
Full replacementIcingaHost and service checks with Nagios-compatible plugins, notifications and a web UI.
PartialNagios CoreHost and service checks with plugins and notifications, with a basic CGI web UI.
Icinga
Nagios Core
- nagios-4.5.142026-08-05Release 4.5.14
- nagios-4.5.132026-05-28Release 4.5.13
- nagios-4.5.122026-03-25Release 4.5.12
- nagios-4.5.112026-01-15Release 4.5.11
- nagios-4.5.102025-10-28Release 4.5.10
Icinga
✓ signed The latest release, v2.16.5, carries a signature GitHub verified.
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Nagios Core
unsigned The latest release, nagios-4.5.14, carries no signature GitHub could verify.
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