Trusted by 5,500+ teams worldwide

Uptime monitoring
that catches outages fast

We check your site every 30 seconds and alert you the moment it goes down. No more finding out about downtime from your customers.

30-second checks from 7 global regions
Alerts in seconds via Slack, Email, SMS, PagerDuty
Beautiful status pages included
No credit card required to start

Start monitoring free

Talk to Max

Free 14-day trial · No credit card required

Trusted by thousands of businesses

Uptime monitoring that works for you

Stop worrying about missing outages. Start knowing instantly.

Finding out from angry customers

Get alerted the moment your site goes down

Slow 5-minute check intervals

We check every 30 seconds, catching outages faster

Confusing dashboards

Simple, clean interface built for developers

False positives waking you up

Multi-region verification before alerting

Start tracking uptime in 30 seconds

Enter your URL

Add the URL you want to monitor. We'll start checking it immediately.

Connect your alerts

Choose how you want to be notified: Slack, Email, SMS, or PagerDuty.

Relax

We check every 30 seconds and alert you instantly if anything goes wrong.

Start your free uptime monitor

Free 14-day trial · No credit card required

Trusted by software teams worldwide

OnlineOrNot is built for scale and runs millions of uptime checks every week. Thousands of software teams, including some of the world's leading brands have already made the switch from other uptime monitors.

Uptime Checks last week: 15.9M
Users: 5,858
Detected incidents last week: 1,124

- OnlineOrNot has been absolutely fantastic for my bot, Noti. It completely transformed the way I monitor online services.
  The real-time notifications keep me in the loop about any downtime, allowing me to take immediate action. If you're looking for a reliable way to monitor your project's status, I highly suggest using OnlineOrNot.
  Adam H
  Maker of Noti
- Bet on indie hackers 🚀
  I tried @RozenMD's OnlineOrNot uptime monitoring, and for a few days got notifications of 2min down time.
  I thought that OnlineOrNot was wrong as Uptime Robot wasn't reporting anything.
  Turns out it was the other way around.
  Khaled Bentoumi
  Founder of Data to Page
- We've been using OnlineOrNot and it has been a life saver.
  It, by far, has been one of the most responsive uptime services we've tried and it only gets better and better as time goes on.
  Alex Bowles
  Founder of Casterlabs
- I just set up some site aliveness checks for @Archium_io with @RozenMD's OnlineOrNot.
  Took me less than five minutes and it was completely self-explanatory, not to mention gorgeous. Seriously good experience.
  Great job, Max! 👏👏
  Graham Lea
  Founder of Archium.io
- OnlineOrNot by @RozenMD is all one needs
  It is easy to set up and very reliable. I have been using it for almost an year now.
  Rajat Saxena
  Founder of CourseLit
- I'm using OnlineOrNot to monitor my @cloakist customers' sites, so I can respond quickly if they stop working
  Love it. Super clean interface, very intuitive. Particularly impressed at how it can wait for full page load
  Thanks @RozenMD for making this awesome tool!
  Louis Barclay
  Founder of Cloakist
- OnlineOrNot does the job for me.
  Charles Miller
  Software Architect at Atlassian