Monitoring tools with a free plan in 2026
Check that services, hosts, networks and scheduled jobs are up and healthy, from inside and outside. This list has 115 monitoring tools. Of these, 67 are open source, 115 have a free plan and 74 can be self-hosted. Checked by hand on 30 September 2026.
- 1
Akvorado
Flow collector and visualizer that receives NetFlow, IPFIX and sFlow, enriches flows with interface and routing data, stores them in ClickHouse and shows them in a web UI.
- 2
AlertKick
On-call rosters, escalation policies and paging by mobile push, SMS, WhatsApp, Telegram, Slack and email, with uptime, heartbeat and SSL checks and hosted status pages. Priced per server rather than per user.
- 3
Alibaba Cloud CloudMonitor
Alibaba Cloud's monitoring service for its cloud resources and hybrid environments, with metrics, event alerts and support for Prometheus, Grafana and OpenTelemetry data.
- 4
Amazon CloudWatch
AWS's native monitoring service: collects metrics and logs from AWS services and your apps, with alarms, dashboards, synthetic canaries and application signals.
- 5
Amazon Managed Service for Prometheus
Serverless, Prometheus-compatible metrics store on AWS: remote-write metrics from EKS or other clusters and query them with PromQL.
- 6
Apache HertzBeat
Agentless monitoring system from the Apache Software Foundation that polls servers, databases, middleware, network devices and websites through templates, with built-in alerting.
- 7
Assertible
API testing and monitoring: define HTTP requests with assertions, run them on a schedule or after each deploy, and get alerted when a check fails.
- 8
Azure Monitor
Microsoft Azure's monitoring service for metrics, logs and traces from Azure resources and apps, including Application Insights, Log Analytics, alerts and managed Prometheus.
- 9
Beszel
Lightweight self-hosted server monitor: a small agent reports CPU, memory, disk, network and Docker container stats to a hub that keeps history and sends alerts.
- 10
Better Stack
Observability suite that pairs uptime checks, logs and metrics with on-call schedules, escalation policies, phone and SMS alerts and hosted status pages.
- 11
Blackbox exporter
Prometheus exporter that probes endpoints over HTTP, HTTPS, DNS, TCP, ICMP and gRPC and exposes the results as metrics you can alert on.
- 12
Bleemeo
Hosted monitoring for servers, containers and Kubernetes built on an open source agent, with uptime checks, dashboards and alert rules.
- 13
Botkube
Kubernetes ChatOps bot that posts cluster events and alerts to Slack, Discord or Mattermost and lets you run kubectl from chat.
- 14
Cacti
Network graphing tool built on RRDtool: polls devices over SNMP or scripts and draws long-term graphs of traffic and system metrics.
- 15
cAdvisor
Google's container advisor: a daemon that collects resource usage and performance data for running containers and exposes it to Prometheus. Built into the kubelet.
- 16
Centreon
IT infrastructure and network monitoring platform that runs Nagios-compatible plugins, offered as open source and as commercial on-premises and cloud editions.
- 17
CheckCle
Self-hosted open source monitor for HTTP, ping, TCP and DNS uptime, server metrics and SSL expiry, with incident tracking and public status pages.
- 18
Checkly
Synthetic monitoring for developers: API checks and Playwright browser checks written as code, deployed from CI and run from many regions.
- 19
Checkmate
Self-hosted open source monitor from BlueWave Labs for HTTP, ping, TCP port, DNS, WebSocket and gRPC checks, with an optional agent for server hardware metrics and status pages.
- 20
Checkmk
Infrastructure monitoring for servers, networks, cloud and containers with automatic service discovery; the base edition is open source and paid editions add more.
- 21
Cloudprober
Active prober that started at Google: runs HTTP, DNS, ping, TCP, gRPC and custom probes and exports latency and success metrics to Prometheus and other backends.
- 22
ClusterControl
Severalnines platform to deploy, monitor and manage open source database clusters such as MySQL, PostgreSQL, MongoDB and Redis on your own servers or cloud.
- 23
Coroot
Open source observability that uses eBPF to build service maps and collect metrics, logs, traces and profiles without code changes, with root-cause hints.
- 24
cronalive
Heartbeat monitoring for cron jobs with HTTP uptime and TLS expiry checks, plus Laravel, Python and Node packages that create checks from code.
- 25
Cronitor
Monitoring for cron jobs, background workers and scheduled tasks that tracks run duration and failures, plus website uptime checks and status pages.
- 26
Dead Man's Snitch
Dead man's switch for cron jobs and scheduled tasks: each job checks in to a unique URL, and a missed check-in triggers an alert.
- 27
DigitalOcean Monitoring
Built-in metrics and alert policies for DigitalOcean Droplets and other resources, collected by a small agent, at no extra charge.
- 28
Downtime Monkey
Website uptime monitoring with downtime alerts and a generous free plan, aimed at small sites and people watching many client websites.
- 29
Dozzle
Small web UI that streams and searches live Docker container logs across hosts, with no log storage. Optional Dozzle Cloud adds grouped alerts and log analysis.
- 30
Drumbeats
Cron job, heartbeat and uptime monitoring with incident tracking and status pages, billed by check-in volume rather than monitor count.
- 31
ElastiFlow
Flow and SNMP collector that ships network flow records to Elasticsearch, OpenSearch and other stores, with ready-made dashboards and security detections.
- 32
FlareWarden
Uptime, SSL, DNS and page-content monitoring that confirms an outage from several regions before alerting, with cron checks and status pages.
- 33
Freelens
Community-maintained open source Kubernetes desktop IDE, forked from OpenLens, for managing clusters and viewing workloads, metrics and logs.
- 34
Gatus
Health dashboard configured in YAML: checks HTTP, TCP, DNS, ICMP and other endpoints against conditions on status, body and latency, and alerts to many channels. Also sold as a hosted service.
- 35
Glances
Cross-platform system monitor in Python that shows CPU, memory, disk, network, processes and containers in a terminal, a web UI or a REST API.
- 36
Google Cloud Observability
Google Cloud's suite (formerly Stackdriver) of Cloud Monitoring, Logging and Trace for metrics, logs, uptime checks and alerting on Google Cloud and other environments.
- 37
groundcover
Kubernetes observability that uses an eBPF sensor and runs in your own cloud account, covering logs, traces, metrics and APM without code changes.
- 38
Headlamp
Kubernetes web UI and desktop app, now a Kubernetes SIG UI project, for browsing cluster resources, logs and events, extensible with plugins.
- 39
Healthchecks.io
Cron job and heartbeat monitoring: each job pings a unique URL, and a missed or late ping sends an alert. The server is open source and can be self-hosted.
- 40
HetrixTools
Uptime monitoring for websites and servers checked every minute from 12 locations, with an optional server agent, status pages and IP/domain blacklist monitoring.
- 41
Hubble
Network observability layer for Cilium that shows service dependencies, network flows and DNS and HTTP traffic between Kubernetes workloads, using eBPF.
- 42
Hyperping
Uptime, browser and cron job monitoring bundled with status pages and incident updates, plus a small server monitoring agent.
- 43
Icinga
Monitoring system that grew out of Nagios: checks hosts and services with plugins, scales across distributed zones, and is configured through files or an API.
- 44
Inspektor Gadget
CNCF project of eBPF-based tools (gadgets) for inspecting and debugging Kubernetes workloads and Linux hosts, from network traces to process and file activity.
- 45
K8sGPT
CLI and operator that scans Kubernetes clusters for problems and explains them in plain language using an LLM backend of your choice. CNCF sandbox project.
- 46
k9s
Terminal UI for Kubernetes that lists and watches cluster resources in real time and lets you view logs, exec into pods and act on resources with keystrokes.
- 47
kube-state-metrics
Kubernetes add-on that listens to the API server and exposes the state of objects such as deployments, pods and nodes as Prometheus metrics.
- 48
Kubernetes Dashboard
The former official web UI for viewing and managing workloads and resources in a Kubernetes cluster.
- 49
kubernetes-event-exporter
Exports Kubernetes events to sinks such as Slack, Opsgenie, Elasticsearch, Kafka or webhooks, so events can be kept and alerted on.
- 50
Kubeshark
Captures and dissects API traffic between Kubernetes pods (HTTP, gRPC, Kafka, DNS and more) so you can inspect requests cluster-wide, like Wireshark for Kubernetes.
- 51
Kubewatch
Kubernetes watcher that reports resource changes in the cluster to Slack, Mattermost and other chat channels or to a webhook.
- 52
Kuvasz Uptime
Self-hosted uptime and SSL certificate monitor with brandable public or private status pages, maintenance windows and alerts to common chat and email channels.
- 53
LastPing
Dead man's switch monitoring for cron jobs, CI pipelines and AI agents, with an MCP server so agents can set up their own monitors.
- 54
Lens
Desktop Kubernetes IDE for browsing clusters, resource metrics and logs across many clusters. Free for individuals and small organizations; paid plans add team and enterprise features.
- 55
LibreNMS
Network monitoring system with automatic SNMP discovery, graphs and alerting, supporting a long list of network hardware vendors.
- 56
Longview
Akamai Cloud (Linode) system graphing service: an open source agent reports CPU, memory, disk and network per process. Longview Pro adds 1-minute data and full history.
- 57
ManageEngine OpManager
On-premises network and server monitoring for routers, switches, firewalls, Windows and Linux hosts and virtual machines.
- 58
MarionetteOps
Uptime, SSL, domain, cron and agent-based server monitoring aimed at agencies, with client-facing status pages.
- 59
Metrics Server
Cluster-wide aggregator of CPU and memory usage from kubelets, serving the Metrics API used by kubectl top and the Horizontal Pod Autoscaler.
- 60
Monika
Command-line synthetic monitor from Hyperjump: define HTTP, TCP, ping and database probes in a YAML file, run them anywhere, and send alerts to many channels.
- 61
Monit
Small Unix daemon that watches processes, files, filesystems and hosts and can restart a service or send an alert when a check fails. M/Monit is the paid central console.
- 62
Monitorable
Hosted Linux server monitoring with a one-command install of an open source OpenTelemetry-based agent, default alert rules, and alerts by email, Telegram, Discord, Slack, ntfy, webhook or PagerDuty.
- 63
MonitorMonk
Uptime monitoring for websites and API endpoints with SSL, keyword, HTTP status and response-time checks, plus shareable dashboards.
- 64
Munin
Networked resource monitoring: a master polls lightweight node agents and their plugins and graphs server metrics over time.
- 65
mysqld_exporter
Official Prometheus exporter for MySQL and MariaDB that exposes server status, InnoDB and replication metrics.
- 66
Naemon
Fork of the Nagios 4 core with performance improvements, compatible with Nagios configuration files and plugins.
- 67
Nagios Core
Long-running open source host and service checker with a large plugin ecosystem; Nagios XI is the commercial edition built on it.
- 68
NetAlertX
Self-hosted scanner that discovers devices on your network and alerts when new, unknown or offline devices appear.
- 69
Netdata
Per-second metrics for servers, containers and applications from an agent with built-in dashboards and alerts, plus the optional hosted Netdata Cloud.
- 70
Netdisco
Open source network management tool that discovers switches and routers over SNMP and lets you locate devices by MAC or IP, browse ports and track inventory.
- 71
NetXMS
Network and infrastructure management system with SNMP discovery, network maps, server agents and event correlation; an Enterprise edition adds support and features.
- 72
Nezha
Self-hosted monitoring panel for small server fleets: agents report host status and resource use, and the panel can run uptime checks and remote tasks.
- 73
ntopng
Web-based network traffic monitor that analyses packets or flows to show top talkers, applications, hosts and alerts. Open source Community edition with paid Pro and Enterprise versions.
- 74
Observium
Network monitoring platform with SNMP auto-discovery of devices; a free Community Edition and a paid Professional edition with faster updates.
- 75
OCI Monitoring
Oracle Cloud Infrastructure's metrics and alarms service for OCI resources and custom application metrics, queried with its Monitoring Query Language.
- 76
OnlineOrNot
Uptime monitoring for websites and APIs, browser checks, cron job heartbeats and status pages, run by a small independent team.
- 77
openITCOCKPIT
Monitoring suite that manages Naemon checks through a web interface, with Checkmk and Grafana integration; community and enterprise editions.
- 78
OpenNMS
Network management platform for fault and performance monitoring at scale; Horizon is the open source edition and Meridian the supported one.
- 79
Pandora FMS
Monitoring for servers, networks, applications and logs, with an open source community edition and a commercial enterprise edition.
- 80
Peekaping
Self-hosted uptime monitor written in Go with a React UI, built as an alternative to Uptime Kuma, with status pages and pluggable notification channels.
- 81
Percona Monitoring and Management
Open source monitoring for MySQL, PostgreSQL, MongoDB and Valkey: a server and client agents collect metrics and query analytics, with Grafana-based dashboards and alerting.
- 82
pgBadger
PostgreSQL log analyzer that turns server logs into HTML reports on slow queries, errors, locks, checkpoints and connections.
- 83
PgHero
Small web dashboard for Postgres that shows slow queries, index usage, table bloat and connection counts. Runs as a Rails engine or a Docker container.
- 84
pgMonitor
Crunchy Data's bundle of Prometheus exporter queries, alert rules and Grafana dashboards for monitoring PostgreSQL and its hosts.
- 85
pgwatch
PostgreSQL monitoring from Cybertec that gathers metrics with SQL queries and stores them in Postgres or Prometheus for the bundled Grafana dashboards.
- 86
Phare
Uptime monitoring with incident management and status pages, billed by the number of check requests rather than per monitor.
- 87
Pingmeter
Uptime monitoring for HTTP, HTTPS, SSH and custom TCP ports, with SMS and voice alerts on paid plans.
- 88
PingPlotter
Network troubleshooting tool that runs continuous traceroutes to chart latency and packet loss hop by hop. Desktop editions include a free version; the Cloud edition monitors remote users.
- 89
Pixie
Kubernetes observability that uses eBPF to capture service traffic, metrics and CPU profiles automatically; a CNCF sandbox project.
- 90
pmacct
Set of passive network monitoring daemons that collect NetFlow, IPFIX, sFlow, BGP and BMP data and export traffic accounting to databases or message brokers.
- 91
postgres_exporter
Prometheus exporter that exposes PostgreSQL server statistics as metrics for Prometheus to scrape and alert on.
- 92
PoWA
PostgreSQL Workload Analyzer: collects query statistics from pg_stat_statements and related extensions into a history you browse in a web UI, with index suggestions.
- 93
Prometheus Operator
Kubernetes operator that deploys and configures Prometheus and Alertmanager from custom resources. Its kube-prometheus project and the kube-prometheus-stack Helm chart bundle a full cluster monitoring setup.
- 94
PRTG Network Monitor
Windows-based network and server monitoring from Paessler built around sensors for SNMP, WMI, flows, ping and HTTP, with maps and dashboards.
- 95
Pulsetic
Website uptime and SSL monitoring with status pages, incident notes and pay-per-alert SMS and phone calls.
- 96
Robusta
Kubernetes alert enrichment and routing on top of Prometheus: adds pod logs, events and graphs to alerts and sends them to Slack, Teams and other sinks. Open source core plus a paid SaaS.
- 97
Runitor
Command runner for Healthchecks.io: wraps a job, sends start, success or failure pings with its output, and also works with self-hosted Healthchecks.
- 98
Scaleway Cockpit
Scaleway's observability service built on Grafana, Mimir, Loki and Tempo, collecting metrics and logs from Scaleway products by default and accepting external data.
- 99
Scrutiny
Web dashboard for hard drive S.M.A.R.T. data that tracks disk health over time and warns before a drive fails.
- 100
Sensu
Monitoring event pipeline for dynamic infrastructure: agents run checks, and filters and handlers route the results to alerting and metrics tools, all managed as code.
- 101
Servervana
Uptime monitoring with HTTP, browser, DNS and domain checks and status pages, built for larger projects with many teams.
- 102
Simple Observability
Hosted server monitoring that collects metrics and logs through one agent, with dashboards and alerts and little setup.
- 103
Site24x7
Zoho's monitoring suite for websites, servers, networks, applications and cloud, with synthetic transactions and RUM; plain uptime checks have a free plan.
- 104
Sitesure
Heartbeat and scheduled-task monitoring alongside website uptime, SSL, DNS and domain checks, priced per monitor.
- 105
SmokePing
Latency monitor that probes hosts continuously and graphs latency and packet loss distribution over time.
- 106
StatusCake
Website monitoring with uptime, page speed, domain and SSL checks from test locations around the world.
- 107
SweetUptime
Uptime, domain, SSL and server monitoring from DiCloud, with status pages and downtime alerts.
- 108
Uptime Kuma
Self-hosted monitor for HTTP, keyword, TCP, ping, DNS, Docker and push checks, with status pages and dozens of notification integrations.
- 109
UptimeFlare
Serverless uptime monitor and status page that runs on Cloudflare Workers, checking HTTP and TCP endpoints and sending notifications.
- 110
UptimeObserver
Uptime, SSL and domain monitoring with a customizable status page and email and Telegram alerts, free plan allowed for commercial use.
- 111
UptimeRobot
Uptime monitoring for websites, APIs, ports, ping, keywords, SSL, DNS and cron heartbeats, with status pages and team alerting.
- 112
WatchCron
Cron job monitoring with heartbeat pings and alerts, plus hosted cron jobs that call your URLs on a schedule.
- 113
Watchgoose
Heartbeat monitoring and status pages for cron jobs, backups and background workers, with an MCP server and free plans for open source projects.
- 114
Xymon
Long-standing system and network monitor that shows host and service status on a color-coded web page, with client agents for host data.
- 115
Zabbix
Open source monitoring for networks, servers, VMs, applications and cloud, using agents, SNMP and templates with trigger-based alerting; Zabbix Cloud is the hosted option.
Side by side
| Tool | Pricing | Free plan | Open source | Self-hosted |
|---|---|---|---|---|
| Akvorado | Free | Yes | Yes | Yes |
| AlertKick | Free plan | Yes | No | No |
| Alibaba Cloud CloudMonitor | Free plan | Yes | No | No |
| Amazon CloudWatch | Free plan | 10 custom metrics, 10 alarms, 5 GB logs per month | No | No |
| Amazon Managed Service for Prometheus | Free plan | 40M samples ingested, 10 GB stored (AWS Free Tier) | No | No |
| Apache HertzBeat | Free | Yes | Yes | Yes |
| Assertible | Free plan | Yes | No | No |
| Azure Monitor | Free plan | Yes | No | No |
| Beszel | Free | Yes | Yes | Yes |
| Better Stack | Free plan | 10 monitors and heartbeats, 1 status page | No | No |
| Blackbox exporter | Free | Yes | Yes | Yes |
| Bleemeo | Free plan | 3 servers, 5 uptime monitors | No | No |
| Botkube | Free | Yes | Yes | Yes |
| Cacti | Free | Yes | Yes | Yes |
| cAdvisor | Free | Yes | Yes | Yes |
| Centreon | Free plan | Yes | Yes | Yes |
| CheckCle | Free | Yes | Yes | Yes |
| Checkly | Free plan | 1 user, 10k API and 1k browser check runs/mo | No | No |
| Checkmate | Free | Yes | Yes | Yes |
| Checkmk | Free plan | Yes | Yes | Yes |
| Cloudprober | Free | Yes | Yes | Yes |
| ClusterControl | Free plan | Community edition: deploy and monitor clusters | No | Yes |
| Coroot | Free plan | Yes | Yes | Yes |
| cronalive | Free plan | 10 checks, 5-min HTTP interval, 50k pings/mo | No | No |
| Cronitor | Free plan | 5 monitors, email and Slack alerts | No | No |
| Dead Man's Snitch | Free plan | 1 snitch | No | No |
| DigitalOcean Monitoring | Free | Yes | No | No |
| Downtime Monkey | Free plan | 60 websites | No | No |
| Dozzle | Free plan | Yes | Yes | Yes |
| Drumbeats | Free plan | 200K check-ins (beats)/mo | No | No |
| ElastiFlow | Free plan | Basic: 4,000 records/s, 25 SNMP devices | No | Yes |
| FlareWarden | Free plan | 15 monitors, 5-min checks | No | No |
| Freelens | Free | Yes | Yes | Yes |
| Gatus | Free plan | Yes | Yes | Yes |
| Glances | Free | Yes | Yes | Yes |
| Google Cloud Observability | Free plan | 150 MiB metrics per billing account, 50 GiB logs/project | No | No |
| groundcover | Free plan | Yes | No | Yes |
| Headlamp | Free | Yes | Yes | Yes |
| Healthchecks.io | Free plan | 20 jobs | Yes | Yes |
| HetrixTools | Free plan | 15 uptime monitors, 1-min checks | No | No |
| Hubble | Free | Yes | Yes | Yes |
| Hyperping | Free plan | 20 monitors, 5-min checks | No | No |
| Icinga | Free plan | Yes | Yes | Yes |
| Inspektor Gadget | Free | Yes | Yes | Yes |
| K8sGPT | Free | Yes | Yes | Yes |
| k9s | Free | Yes | Yes | Yes |
| kube-state-metrics | Free | Yes | Yes | Yes |
| Kubernetes Dashboard | Free | Yes | Yes | Yes |
| kubernetes-event-exporter | Free | Yes | Yes | Yes |
| Kubeshark | Free plan | Community: up to 3 nodes and 60 pods | Yes | Yes |
| Kubewatch | Free | Yes | Yes | Yes |
| Kuvasz Uptime | Free | Yes | Yes | Yes |
| LastPing | Free plan | Free for individuals | No | No |
| Lens | Free plan | Personal plan: orgs under $10M revenue or funding | No | Yes |
| LibreNMS | Free | Yes | Yes | Yes |
| Longview | Free plan | Up to 10 clients, 5-min data, 12h history | No | No |
| ManageEngine OpManager | Free plan | Free edition: 3 devices | No | Yes |
| MarionetteOps | Free plan | 20 uptime + 20 server monitors | No | No |
| Metrics Server | Free | Yes | Yes | Yes |
| Monika | Free | Yes | Yes | Yes |
| Monit | Free plan | Yes | Yes | Yes |
| Monitorable | Free plan | 3 servers | No | No |
| MonitorMonk | Free plan | 10 websites, 2 dashboards | No | No |
| Munin | Free | Yes | Yes | Yes |
| mysqld_exporter | Free | Yes | Yes | Yes |
| Naemon | Free | Yes | Yes | Yes |
| Nagios Core | Free plan | Yes | Yes | Yes |
| NetAlertX | Free | Yes | Yes | Yes |
| Netdata | Free plan | 5 nodes, non-commercial use | Yes | Yes |
| Netdisco | Free | Yes | Yes | Yes |
| NetXMS | Free plan | Yes | Yes | Yes |
| Nezha | Free | Yes | Yes | Yes |
| ntopng | Free plan | Yes | Yes | Yes |
| Observium | Free plan | Yes | No | Yes |
| OCI Monitoring | Free plan | Yes | No | No |
| OnlineOrNot | Free plan | 2 users, 3-min check interval | No | No |
| openITCOCKPIT | Free plan | Yes | Yes | Yes |
| OpenNMS | Free plan | Yes | Yes | Yes |
| Pandora FMS | Free plan | Yes | Yes | Yes |
| Peekaping | Free | Yes | Yes | Yes |
| Percona Monitoring and Management | Free | Yes | Yes | Yes |
| pgBadger | Free | Yes | Yes | Yes |
| PgHero | Free | Yes | Yes | Yes |
| pgMonitor | Free | Yes | Yes | Yes |
| pgwatch | Free | Yes | Yes | Yes |
| Phare | Free plan | 100,000 monitoring events/mo | No | No |
| Pingmeter | Free plan | Fewer than 5 uptime monitors | No | No |
| PingPlotter | Free plan | Yes | No | No |
| Pixie | Free | Yes | Yes | Yes |
| pmacct | Free | Yes | Yes | Yes |
| postgres_exporter | Free | Yes | Yes | Yes |
| PoWA | Free | Yes | Yes | Yes |
| Prometheus Operator | Free | Yes | Yes | Yes |
| PRTG Network Monitor | Free plan | Freeware edition: 100 sensors | No | Yes |
| Pulsetic | Free plan | Yes | No | No |
| Robusta | Free plan | Yes | Yes | Yes |
| Runitor | Free | Yes | Yes | Yes |
| Scaleway Cockpit | Free plan | Yes | No | No |
| Scrutiny | Free | Yes | Yes | Yes |
| Sensu | Free plan | Yes | Yes | Yes |
| Servervana | Free plan | Yes | No | No |
| Simple Observability | Free plan | 1 server, 50 metrics | No | No |
| Site24x7 | Free plan | Uptime checks for 50 resources, email alerts | No | No |
| Sitesure | Free plan | 2 monitors | No | No |
| SmokePing | Free | Yes | Yes | Yes |
| StatusCake | Free plan | 10 uptime monitors, 5-min intervals | No | No |
| SweetUptime | Free plan | 20 uptime monitors, 10 servers | No | No |
| Uptime Kuma | Free | Yes | Yes | Yes |
| UptimeFlare | Free | Yes | Yes | Yes |
| UptimeObserver | Free plan | 20 monitors, 5-min interval, 1 status page | No | No |
| UptimeRobot | Free plan | 50 monitors, 5-min interval | No | No |
| WatchCron | Free plan | 20 checks, 3 cloud cron jobs | No | No |
| Watchgoose | Free plan | 10 checks, 1 user | No | No |
| Xymon | Free | Yes | Yes | Yes |
| Zabbix | Free plan | Yes | Yes | Yes |
Plans and prices change; check each tool's own site before you decide.