Buyer guide

Best open-source uptime monitoring in 2026 — and when hosted beats self-hosted

Self-hosted monitoring is genuinely good now — Uptime Kuma alone made it mainstream. But a monitor you run yourself has one structural blind spot: it lives inside the infrastructure it watches, and it needs its own babysitter. Here is an honest guide to the open-source options and to when hosted simply wins.

Start free See all comparisons

How to choose

What to weigh

The vantage problem: A monitor inside your network dies with your network. External probing needs at least one vantage point you do not operate.
Total cost honestly: "Free" self-hosting still buys a server, OS updates, backups, and the hours — compare that against $0–9/month hosted plans.
Maintenance burden: Who upgrades it, who monitors the monitor, and what happens when the disk fills at 2 a.m.
Notification reach: Whether alerts can reach chat, webhooks, and paging tools without extra glue.

The shortlist

Tools worth comparing, with honest pros and cons

Alternative

Uptime Kuma

The self-hosted favorite: a polished, MIT-licensed monitoring dashboard.

Pros: Free MIT-licensed software with HTTP, TCP, DNS, ping, and keyword checks at fast intervals
Dozens of notification providers and hosted-feeling status pages
Huge community; runs happily in one Docker container
Cons: Watches from wherever you run it — an outage that takes your host down takes the monitor with it
You own upgrades, backups, disk space, and the uptime of the uptime monitor

Alternative

Healthchecks.io

Open-source (BSD) cron and heartbeat monitoring, hosted or self-hosted.

Pros: The rare project that is excellent both self-hosted and as a hosted service (20 free checks)
Self-hosting lets it watch jobs inside private networks
Cons: Heartbeats only — it does not probe websites or APIs from outside
Self-hosted instances still need the vantage-point question answered

Alternative

Gatus

Config-as-code health dashboard for teams that want monitoring in git.

Pros: Apache-2.0, YAML-defined checks reviewed like any other code change
Clean status dashboard; strong fit for GitOps shops
Cons: Smaller ecosystem than Uptime Kuma
Same self-hosted vantage and maintenance realities

Alternative

Prometheus Blackbox Exporter

The heavyweight route: probes as metrics in a Prometheus stack.

Pros: HTTP, TCP, ICMP, and DNS probes flow into Prometheus alerting and Grafana dashboards you may already run
Unmatched flexibility for teams with existing observability infrastructure
Cons: Assembling exporter, Prometheus, Alertmanager, and dashboards is real work
Heavily inside-the-infrastructure by design

PageLantern

The hosted counterpoint — and the external watchdog for a self-hosted stack.

Pros: Zero servers to run: 15 free monitors probe from outside your infrastructure, which is the vantage self-hosting cannot give itself
Heartbeat checks make it a watchdog for Uptime Kuma or a Prometheus stack — if your monitor dies, the silence pages you
Incidents, status pages, and audit trails without operating any of it
Cons: Not open source and no self-hosted option
A hosted subscription rather than software you control end to end

FAQ

Frequently asked questions

Is Uptime Kuma good enough for production monitoring?

The software is genuinely good — polished UI, many check types, huge notification catalog. The production question is placement, not quality: run it outside the infrastructure it watches (a separate VPS at minimum), keep it updated and backed up, and give it a watchdog. A monitor on the same host as the workload misses exactly the outages that matter most.

Is self-hosted monitoring really free?

The license is free; the operation is not. A small VPS often runs $5–10/month before OS updates, disk, backups, and labor — roughly the price band of hosted entries such as PageLantern Starter at $9 and UptimeRobot Solo at $10. Self-hosting wins on control and data ownership, not automatically on total cost.

Can I combine self-hosted and hosted monitoring?

That is often the strongest setup: self-host Uptime Kuma or a Prometheus stack for rich internal visibility, and point a hosted monitor at your public endpoints from outside — plus a heartbeat check on the self-hosted monitor itself, so its failure pages you. PageLantern’s free tier covers both roles for a small stack.