All of it from the properties and sitemaps already in your Search Console, or from a site's address. Nothing to install.
Straight from Search Console
Sign in with Google and your verified properties become monitors
Sitemaps you submitted to Google are picked up automatically
Synced every hour: new sites and sitemaps appear on their own
Clicks and impressions in Google Search for the last 24 hours, 7, 30 and 90 days, beside each site's uptime
Several Google accounts, merged into one list, grouped per account
Read-only access; properties you are not verified for are reported
Not in Search Console? Add a site by its address: uptime and sitemaps; its pages are checked once it is in your Search Console
Google's own sitemap status: last downloaded, errors, warnings, pending
An alert when Google stops fetching a sitemap for 14 days, and when it fetches it again
Uptime
Checks from every minute to once a day, per site
Timeout of 5 to 30 seconds, follow redirects or not
Down after 2 failed checks in a row, so one blip is not an outage
Error pages served with 200 count as down: database errors, PHP fatal errors, suspended hosting, parked domains
An alert when the home page turns noindex or its canonical points to another site
A text the home page must contain, suggested from the page itself, so an empty page is caught
A staging site behind a password: one click says 401 is the right answer
Domain expiry: warned 30, 14 and 7 days ahead, for every site, nothing to set up
Domain Rating by Ahrefs for every site's domain, read every 7 days, with an arrow for how it moved in 4 weeks and a graph over time
Uptime for 24 hours, 7, 30 and 90 days, and response times
A status bar you switch from the figures: the last day by the hour, the week by six hours, 30 and 90 days by the day
Incident log with start, end and duration
Test now, any time
Sitemaps
URL count on every fetch: how many entries the sitemap lists, with a 90-day chart
Minimum URL count: an alert when it drops below, say, 100
What changed since the last fetch: URLs added and removed
Every URL with its last-modified date and status, searchable
Validated against the sitemaps.org protocol: an HTML page instead of XML, truncated files, entries without a URL, unescaped &, relative or off-site URLs, duplicates, bad or future dates, the 50,000 URL and 50 MB limits
Sitemap indexes followed (up to 50 child sitemaps), gzipped sitemaps, and image and video extensions handled correctly
A rolling sample of the pages themselves checked for 404s and server errors: at least one page per sitemap a day, 500 more a day per unit
Fetched every 1 to 24 hours, per sitemap (every 6 hours or less often on the free plan)
Alerts
Email when a site goes down, and again when it is back
Email when a sitemap breaks, drops below its minimum, or recovers
Also to Slack, Discord or any webhook
More addresses for the alerts: a colleague, a client or a shared inbox, each asked first
One email per change, not one per check
Mute a site's alerts for 24 hours, and send a test alert to see that they arrive
On from the start, and one click switches them off
In your control
Switch any site or sitemap off and on; history is kept
A quick menu on every site and sitemap: pause, test, interval in one click
Fold sites and whole Google accounts down to one line
A status link per workspace: your sites and whether they are up as a page for a dashboard, an image, JSON, or a health address that answers 200 or 503
Works on your phone, in light and dark mode
Connect Claude, ChatGPT or another AI assistant over MCP: it reads what you see here and can check, add and adjust sites and sitemaps for you
Private by design
Read-only Search Console access, nothing is ever changed there
Google keys encrypted at rest; disconnecting revokes them at Google
Data stored in the EU
No ad trackers, no tracking cookies; mail only to you and the addresses you add yourself
On the way (not there yet): response-time charts per site, a daily digest of broken pages, checks from more than one location, TLS certificate expiry, indexing status from Google's URL Inspection, and public status pages.
Know it before Google does.
Sign in, connect Search Console, and the first check runs within a minute. Free, for every site in your Search Console.