Monitoring · Free for 10 monitors
Port (TCP) monitoring
Watch the services an HTTP check can't reach, and the ports that should never be open. Checkmeup connects to host:port on a schedule and alerts you when the answer changes.
At a glance
- Watches
- A raw TCP connect to host:port
- How often
- 1 min · 5 min on Hobby
- Alerts when
- The port stops answering — or, for one that should stay closed, starts
How it works
Each check is a plain TCP connect to the host and port, closed straight away, with the connect time recorded. Set the expected state to open, the default, or to closed for a port that must stay shut, such as a database that should never face the internet.
Two failed checks in a row mark the monitor down and alert you; a closed-state monitor's alert says the port is unexpectedly open. The next passing check sends a recovery alert with the downtime.
Alerts
Down and recovery alerts go to email, Telegram, Slack or a signed webhook on every plan, and by SMS on paid plans. A monitor with nowhere else to alert emails everyone in your account, so an alert is never lost.
What it doesn't tell you
An open port means something accepted the connection, not that the service behind it works: no handshake or data is sent. Pair it with an uptime check where the service speaks HTTP.
Read more
Plans
Every plan: all six monitor types, projects, execution logs, incidents, maintenance windows, and Telegram, email, Slack and webhook alerts.
| Plan | HobbyFreeYour own side projects | Solo$9/moA freelancer with a few clients | Most popularStartup$29/moA small agency | Enterprise$99/moAn agency with a page per client |
|---|---|---|---|---|
| Monitors | ||||
| Monitors | 10 | 30 | 100 | 1000 |
| Fastest check | ||||
| Fastest check | 5 min | 1 min | 1 min | 1 min |
| Status pages | ||||
| Status pages | 1 | 3 | 10 | 100 |
| White-label status pages | ||||
| White-label status pages | — | |||
| Notification channels | ||||
| Notification channels | 5 | 20 | 50 | 100 |
| SMS credits / month | ||||
| SMS credits / month | — | 10 | 30 | 100 |
| Start free | Start Solo | Start Startup | Start Enterprise | |
Start with 10 free monitors.
No credit card, no expiry date on the free plan.