Instead of Checkmk
Checkmk alternatives
Checkmk monitors cloud, hybrid, and data center infrastructure, including containers and networks. For servers, it pairs more than 2,000 smart checks with auto-discovery and network mapping. Teams can collect data through Windows and Linux agents, agentless SNMP and TCP/UDP, or API-based checks. It supports AWS, Azure, and Google Cloud Platform, and one instance can monitor thousands of servers through distributed monitoring. Deployment options include customer hardware, virtualized environments, Linux packages, Docker, and a Virtual Appliance.
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Netdata
Free plan Open source AndroidAPIiPhone+5Real-time infrastructure metrics and troubleshooting — Netdata adds per-second metrics, ML-based anomaly detection, logs, and export formats such as Prometheus Remote Write and InfluxDB.
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Paessler PRTG Network Monitor
Free plan AndroidAPIiPhone+5On-premises Windows-based systems and network monitoring — PRTG runs on Windows servers and offers more than 250 preconfigured sensors, adaptive AI-driven anomaly detection, and scheduled reports.
Free plan · paid from $200/mo (annual) · 30-day trial Visit site - 3
Centreon
by CentreonFree plan Open source APILinuxSelf-hosted+2Business-aware monitoring across complex infrastructure — Centreon emphasizes business-aware, AIOps-ready monitoring and offers more than 700 connectors across cloud, infrastructure, security, and OT systems.
Free plan · paid from €2.27 · 7-day trial Visit site - 4
Glances
Free plan Open source AndroidAPILinux+4Free cross-platform system and process statistics — Glances focuses on real-time system statistics and processes, with CSV and JSON exports, database and broker outputs, and a REST API.
Free plan Visit site - 5
ManageEngine OpManager
Free plan AndroidAPIiPhone+4Network traffic analysis and device coverage — OpManager adds NetFlow, sFlow, J-Flow, and IPFIX traffic analysis and says it supports more than 11,000 device types.
Free plan · paid from $95 · 30-day trial Visit site - 6
NetXMS
Free plan AndroidAPILinux+4Distributed network discovery and topology maps — NetXMS builds layer 2 and IP topology maps and supports protocols including MQTT, EtherNet/IP, MODBUS-TCP, and OPC UA.
Free plan Visit site - 7
GKrellM
Free plan LinuxMacWindowsFree desktop system monitoring with themes and plugins — GKrellM is a single-process stack of themed system monitors, with configurable sensor and battery alarms and community plugins.
Free plan Visit site - 8
Coroot
Free plan Open source APILinuxSelf-hosted+2 - 9
avuru obs
Free plan APILinuxSelf-hosted+1 - 10
Azure Monitor
Free plan APILinuxMac+2 - 11
Datadog Kubernetes Monitoring
Free plan APILinuxMac+3 - 12
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Google Cloud Monitoring
Free plan APILinuxWeb+1 - 14
Grafana Cloud Application Observability
Free plan AndroidAPIExtension+5 - 15
Honeycomb
Free plan AndroidAPIiPhone+2 - 16
Icinga
Free plan APILinuxSelf-hosted+2 - 17
Middleware
Free plan AndroidAPIExtension+5 - 18
Botkube
Free plan Self-hosted - 19
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New Relic Kubernetes Monitoring
Free plan LinuxSelf-hostedWeb+1 - 21
Perses
Free plan APILinuxMac+2 - 22
Prometheus
Free plan LinuxMacSelf-hosted+2 - 23
Radar
Free plan APILinuxMac+3 - 24
SigNoz
Free plan AndroidAPIiPhone+2 - 25
Site24x7 Kubernetes Monitoring
Free plan AndroidAPIiPhone+5 - 26
Pixie
Free plan LinuxSelf-hostedWeb - 27
Robusta
Free plan APISelf-hostedWeb - 28
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Sematext Monitoring
Free plan LinuxWebWindows - 30
The trade-offs include scale and cost: the free Community plan is aimed at small infrastructures and scales to about 100 hosts, while paid plans start at €190 per month billed annually. A 30-day trial is available, and Checkmk supports API, Linux, macOS, self-hosted, web, and Windows environments. Alternatives may fit better when the priority is per-second metrics, network traffic analysis, or focused system statistics. Compare monitoring scope, protocols, deployment, integrations, and price with the infrastructure you need to cover.