imsu

IS MY SERVER UP?

Less wondering.
More knowing.

Your sites. Your services. Your background jobs.
One place to know they’re doing what they should.

Start monitoring freeExplore the signals

Free to start. No credit card. Set up in minutes.

Back online.Recovery alert delivered
YOUR INFRASTRUCTURE, AT A GLANCEDEMO PREVIEW

LOOKING GOOD

All systems up.

✓
Uptime · 24h99.99%
Avg. response101ms
Monitors up5/ 5
StorefrontHTTPS
182 ms
Checkout APIHTTP
96 ms
Nightly backupHeartbeat
Run finished
Mail serverTCP port
24 ms
Database perimeterReverse port · must stay closed
Closed
● Monitoring around the clockExample data
Backup finishedHeartbeat received · 100%
EVERY SIGNAL COUNTS

HTTP / HTTPS ✳ HEARTBEAT ✳ TCP PORT ✳ REVERSE PORT

BUILT FOR WHAT YOU RUN

Beyond “is the
website up?”

Availability is only part of the story. Watch the endpoints that respond, the jobs that report in, and the ports that should—or shouldn’t—be open.

HTTP / HTTPS01

A 200 isn’t always enough.

Watch websites and APIs with expected status codes, keyword checks, GET or HEAD requests, and redirect settings.

GET /health200 OK ✓Expected keyword found
HEARTBEAT02

Listen for the jobs you can’t see.

Catch missed cron jobs and backups. Track run progress, explicit failures, grace periods, and jobs that take too long to finish.

nightly-backup · run #42100% ✓
Run completed · next ping expected
TCP PORT03

Open for business.

Check whether your public TCP services accept connections. See connection timing and identify refused connections, timeouts, and DNS errors.

mail.example.com:587Connected ↗TCP connection established · 24 ms
REVERSE PORT04

Some doors should stay closed.

Turn the check around: get alerted when a port that should be closed accepts a connection. Keep an eye on exposed databases and admin services.

db.example.com:3306Closed ✓Exactly as expected

One account. All four ways to stay informed.

Watch your first service

WHEN SOMETHING CHANGES

See the signal.
Skip the guesswork.

Downtime and recovery email alerts keep you in the loop. A configurable failure threshold and faster retries help reduce noise from transient failures.

Get started free
↗

Response times, in focus.

Find slowdowns with response-time charts and detailed check results.

◷

Your history, ready to explain.

Compare uptime over 24 hours, 7, 30, or 90 days. Review incidents with their cause and duration.

Ⅱ

You’re in control.

Pause and resume monitors, tune check settings, and choose where your email alerts arrive.

SMALL SETUP. BIG PEACE OF MIND.

From “I should check”
to already checked.

Create your free account
  1. 01

    Make it yours

    Create an account with your name, email, and password. No credit card required.

  2. 02

    Choose your signal

    Add a website during signup, or pick an HTTP, heartbeat, or TCP port monitor in your dashboard.

  3. 03

    Let imsu keep watch

    Review uptime, follow job progress, and receive downtime and recovery email alerts.

YOUR NEXT CHECK STARTS HERE

Go build something.
We’ll keep watch.

Start monitoring free

Quick signup · No credit card · Free to start