Published 2026-08-12
UptimeRobot alternative for agencies
UptimeRobot is where most people start, and for good reason. It is fast to set up, the free tier is genuinely useful, and if the question you have is "did this URL stop answering", it answers it.
This page is for the case where that stopped being the whole question — usually the moment you started looking after other people's sites rather than your own.
The unit of the bill
UptimeRobot counts monitors. So does most of the category. A single client with a website, an API, a mail server and a certificate to watch is one relationship and four rows.
That arithmetic is what agencies notice first. Ten clients is not ten things to watch, it is forty or fifty, and the number goes up every time you do the job properly by adding one more endpoint.
Here a site is the unit. One hostname carries its uptime checks, its certificate, its domain registration, its DNS, its mail authentication records, its response headers and its search visibility, and it counts once. Adding the mail server does not change the bill.
Check their pricing against ours rather than taking a restatement here on trust — prices move, and a stale one in our favour is the one mistake that looks deliberate.
What a ping cannot see
An uptime check answers one question honestly and says nothing about the rest. Every one of these returns a perfectly healthy 200:
- The contact form that stopped delivering. A plugin update expired the CRM key behind it. The page renders, the submission posts, the response is 200, and the leads go nowhere. We actually submit the form — a real POST from a marked address, a few times a day — so this is caught in hours rather than when the client asks why the phone is quiet.
- The domain renewing to an inbox nobody reads. Registered by the client's previous developer. We read the registry directly: expiry, registrar, the transfer lock coming off, DNSSEC.
- Mail that quietly stopped being trusted. An SPF record that needs more than ten DNS lookups is a permanent failure, and the record looks completely reasonable while it happens. We count the lookups, follow every include, and check DMARC, DKIM and MTA-STS against the live MX records.
- A staging
robots.txtthat shipped. Traffic decays over a fortnight instead of falling off a cliff, which is exactly long enough for nobody to connect it to the deploy.
None of these are outages. All of them are the agency's problem the moment the client notices, and an outage — loud, visible, fixed within the hour — is rarely what loses an account.
Everything on every plan
The other difference worth stating plainly: every check runs on every plan here, including the free one. A bigger plan buys more sites, faster checks, longer history and more colleagues. It never buys a category of problem you would otherwise not be told about.
That matters most for the checks that fire twice a year. Certificate expiry and domain registration are exactly the things a tiered product is tempted to move upmarket, and exactly the things you cannot afford to have switched off on the client you onboarded cheaply.
When UptimeRobot is the right answer
If you watch a handful of endpoints, want the shortest possible path to an SMS when one goes down, and the certificate and the mail records are already somebody else's job — it does that well, and this is a heavier tool than you need.
Come back when you are looking after sites for other people and the failures that embarrass you stop being outages.