Self-Hosted vs Hosted Uptime Monitoring: Which Is Right for You

Self-hosted uptime monitoring like Uptime Kuma is free to license but costs you a server, ongoing maintenance, and one significant blind spot: a monitor running inside your own infrastructure can go down in the same outage it was meant to warn you about. Hosted monitoring costs a subscription and removes both problems, checking from outside your failure domain with nothing for you to patch. Self-host when data residency or full control genuinely matters and you already run containers. Choose hosted when you need external, multi-region checks and would rather not own another service. For most teams past a handful of monitors, hosted is cheaper once maintenance hours are counted honestly.

The comparison nobody makes correctly

The usual framing is free versus paid, and it is the wrong axis. Open-source monitors like Uptime Kuma, Gatus, and Zabbix cost nothing to license, and that is real. What the comparison usually leaves out is that you are not choosing between paying and not paying. You are choosing who operates the monitoring service: a vendor, or you. Once you frame it that way, the decision gets much easier, because most teams know exactly how much appetite they have for operating one more thing.

What self-hosting actually costs

Start with the parts that show up on an invoice. A small VPS capable of running the container and its database is somewhere around $5 to $20 a month depending on provider and monitor count. Add a domain or subdomain, a certificate if you are not using an automated issuer, and backups for the database if you care about historical uptime data.

Then add the parts that do not appear on an invoice but consume real hours: OS patching, Docker image updates, certificate renewals, disk cleanup when the check history grows, database maintenance, and the debugging session when the container stops after a host reboot. None of these are hard individually. Together they are a recurring tax on someone's attention, and it is usually the same engineer who has better things to do. If that person's time is worth $75 an hour and the tool takes two hours a month, the free monitor costs $150 a month plus the server. That is more than most hosted plans.

The shared failure domain problem

This is the argument that decides it for most teams, and it has nothing to do with money. A monitoring system's entire job is to tell you when your infrastructure fails. If it runs on that infrastructure, then the failures most worth catching are exactly the ones it cannot report.

Put Uptime Kuma on the same server as your application and a hardware failure, a full disk, a kernel panic, or a provider incident takes down both at once. You get no alert, because there is nothing left to send it. Put it on a second VPS at the same provider in the same region and you have narrowed the overlap but not removed it: a regional network event still takes both. The only self-hosted setup that fully solves this is a separate host at a different provider in a different region, which means you are now operating two independent boxes purely so the monitoring is trustworthy.

Hosted monitoring is external by construction. The checks originate outside your network, from infrastructure that has no dependency on yours, which is the property that makes the alerts meaningful.

Why single-location checks give you worse alerts

A self-hosted monitor checks from exactly one place: wherever the container is running. That produces two kinds of wrong answers. The first is the false alarm, where the network path between your monitor's data center and your server flaps while every real customer is served fine, and you get paged for an outage that does not exist. The second is the miss, where your site is unreachable from Europe or Asia while the one location you check from happens to be fine, so nothing alerts and you find out from a customer.

Checking from several regions fixes both. When one region fails and three succeed, that is a network path problem, not an outage. When all of them fail, it is real. This is why multi-region checks with cross-region confirmation improve alert quality more than any other single setting, and it is the hardest property to replicate yourself, because it means running and maintaining probes in multiple places.

When self-hosting is the right call

It genuinely is the right answer sometimes, and the honest cases are these. If you are monitoring internal services that are not reachable from the public internet, a monitor inside your network is the only thing that can see them, though the best setup usually pairs an internal self-hosted monitor with an external hosted one for the public surface. If a compliance regime or a customer contract requires that operational telemetry stay inside your own environment, that decides it. If you are running a homelab, learning, or watching a handful of personal projects where a missed alert costs nothing, the free option is fine and you will enjoy it. And if you already operate a mature platform team with monitoring for everything else, adding one more service to an existing pipeline is marginal work rather than a new burden.

Does open-source monitoring scale?

Up to a point. Uptime Kuma stores results in SQLite, and past roughly 100 to 150 monitors on short intervals the interface slows noticeably and the database becomes the bottleneck. You can push further by lengthening intervals, pruning history, or migrating storage, but each of those is engineering work spent on the monitoring tool rather than on your product. Larger open-source platforms like Zabbix and Prometheus scale much further, at the cost of significantly more setup and operational knowledge. If you expect to pass a couple of hundred checks, factor that ceiling into the decision before you have 180 monitors and a slow dashboard.

What about the cost comparison at scale?

Run the numbers with maintenance included rather than excluded. At five monitors, self-hosting on a $5 VPS is genuinely cheaper than most subscriptions, and if you enjoy the setup, do it. At fifty monitors across client sites or production services, you are running a database you back up, a certificate you renew, and a service whose downtime you have to notice yourself, and the hours stop being trivial. The cleanest way to make an honest call is to look at what the infrastructure and the engineering time actually add up to over a year, the same discipline you would apply when working out where your cloud spend really goes, and compare that total to a plan price rather than comparing a plan price to zero. Our breakdown of what uptime monitoring actually costs walks through the same maths with real plan prices.

A practical middle path

Plenty of teams run both, and it is a reasonable architecture rather than a compromise. Keep a self-hosted monitor inside the network for internal services, databases, and things that never touch the public internet. Use a hosted service for everything a customer can reach, so those checks come from outside your failure domain and from several regions. The hosted side also gives you the public status page without running yet another service, which is usually the second thing teams end up self-hosting and regretting.

How to decide in five minutes

1. Does anyone lose money when this site is down? If yes, the monitor must be external. That rules out anything sharing infrastructure with the site.
2. Do you have more than about 50 monitors, or will you soon? If yes, weigh the SQLite ceiling and the maintenance curve seriously.
3. Do you need customers to see status during an incident? If yes, count the cost of running a status page too, because a self-hosted one goes down with everything else.
4. Is there a compliance or data residency requirement? If yes, self-host and accept the operational load.
5. Who patches it in six months? If you cannot name that person, you have your answer.

The short version

Self-hosted monitoring is free in license terms and not free in practice: you pay in a server, in hours, and in the blind spot created when your watcher shares a failure domain with the thing it watches. Hosted monitoring costs a predictable subscription and buys external, multi-region checks that keep working precisely when your own infrastructure does not. Self-host for internal services, compliance requirements, and hobby projects. Use hosted for anything customer-facing where a missed alert has a price. If you are currently running Uptime Kuma and the maintenance has started to grate, our Uptime Kuma alternative page covers what moving looks like, and the buyer guide to uptime monitoring tools compares the hosted options side by side.