When your site goes down, your phone knows — before your users do. Uptime, SSL expiry, and latency monitoring with push and email alerts on Pro, within minutes of a change. Free to start, up in under a minute.
How it works
No setup, no infrastructure — add a target and we handle the rest.
Enter any hostname or URL and tap to run a check right from your phone — no cloud, no account needed. Add a free account for host:port (TCP) targets. Ideal for on-the-spot network diagnostics.
On Pro, our servers check your targets every 5 minutes — even when your phone is off or out of signal. Your monitoring keeps running around the clock.
Get push and email notifications when a target goes down, comes back up, latency spikes, or SSL is expiring — cloud checks run every 5 minutes. Use traceroute and full cert details to diagnose fast.
What we check
Point it at any hostname, URL, or host:port. We tell you what’s wrong before your customers do.
See days remaining on every cert. Get warned before expiry — with enough lead time to renew without drama.
See your domain’s registration expiry date, free on every plan. Pro adds alerts 30, 7, and 1 day before it lapses. (Not every TLD publishes an expiry date.)
Add up to 3 rules per target — each one text that must, or must not, be on the page. All rules must pass. Catches a site that returns 200 but is actually broken. Free on a manual check; Pro checks it automatically and alerts you.
Every check measures response time, charted over the last 24 hours. Get alerted when latency spikes — often the first sign of an overloaded server. Pro builds up to 90 days of uptime history plus an incident list.
Pro can also check your targets from your own phone’s network — a second vantage point alongside our cloud checks. Off by default.
HTTPS and HTTP status code checks — catch 5xx errors and unexpected redirects. Go lower-level with TCP port monitoring for databases, mail servers, and custom services.
With Pro, our server checks your targets every 5 minutes — even when your phone is off. It keeps running around the clock, whether or not your phone is on.
Push alerts on downtime, recovery, latency spikes, and SSL expiry milestones — within minutes, because cloud checks run every 5 minutes. Know when something’s wrong, and when it’s resolved.
On-demand traceroute to diagnose routing issues. Pinpoint exactly where in the network the connection breaks down.
Plans
Start free in under a minute. Try Pro free for 1 month.
On-Device
No sign-in needed · on-device only
Registered
Free account · synced across devices
Everything in On-Device, plus:
Pro
1-month free trial · cancel anytime
Everything in Registered, plus:
Get started
Free to start. Add your first target in under a minute, then try Pro free for 1 month.