Free Uptime Monitoring That Also Catches Silent Failures
Know when your site, API, or checkout goes down — and when it comes back. Site Monitor also checks that the page still shows the right content, so a '200 OK' error page doesn't fool it.
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Free plan · 10 URLs · hourly checks · 2 AI summaries/mo · no credit card
Updated
How it works
Add your URLs
Web pages or API endpoints. Set the HTTP method, headers, and body for APIs.
Define 'up'
Expect a specific status code, require text in the response, and set a response-time threshold.
Get one alert each way
One alert when it goes down, one when it recovers — by email, or Slack and webhooks on paid plans.
You choose which alerts each URL sends — downtime, content changes, slow responses — and we email you when they happen.
What you can monitor
- Website and landing-page availability
- API endpoints with custom methods, headers, and bodies
- Expected status codes and response text
- Response time against a threshold
- Uptime history and incidents
Up isn't the same as working
Most outages users notice aren't full outages. A database error rendered inside your layout, an empty product list, or a missing checkout button all return 200 OK. Content checks catch them; pure uptime checks don't.
Built-in status pages
Publish a public status page for your monitors and share it with customers, or embed a live status widget on your own site with two lines of HTML.
Frequently asked questions
How often are uptime checks run?
Free checks every hour. Paid plans check as often as every 5 minutes, and you can set the interval per URL.
Will I get spammed during an outage?
No. You get one alert when a URL goes down and one when it recovers — no repeats while it stays down.
Can I monitor an API that needs headers or a POST body?
Yes. Set the HTTP method, request headers, and body per monitor, then assert the expected status code or response text.
How do alerts reach me?
You choose which alerts each URL sends — downtime, content changes, slow responses — and we email you when they happen, on every plan. Paid plans can also route alerts to Slack or any webhook (Zapier, n8n, Make, a custom bot). You get one alert per change — no alert storms.
Is uptime monitoring free?
Yes. The Free plan covers 10 URLs checked every hour, with 2 AI change summaries a month — no credit card required. Upgrade only if you need faster checks, more URLs, or more AI summaries.
Do I need to install an agent?
No. Site Monitor checks your URLs from the outside, the same way your users reach them.
Start watching your first page
Start watching free → Explore the live demo
Free plan · 10 URLs · hourly checks · 2 AI summaries/mo · no credit card