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SMS alerts
when your
website goes down

Critical downtime alerts sent directly to your phoneWorks even when you're offline or traveling

No credit card required

Trusted by thousands of businesses

Never miss critical website downtime with SMS text alerts

When your website goes down, every second counts. SMS alerts ensure you're notified instantly, even when you're away from your computer, traveling internationally, or in areas with poor internet connectivity.

Unlike email notifications that can get buried in spam folders or missed when you're offline, SMS alerts are delivered directly to your phone.

Stay connected to your website's health, anywhere in the world.

How to setup SMS alerts for website downtime:

Step 1

Create your monitoring account

Step 2

Configure SMS notifications

Add your phone number and choose SMS as your preferred alert method. Set up multiple numbers for team members or on-call rotations.

Step 3

Receive instant mobile alerts

Get text message notifications the moment your website becomes unreachable. Access detailed reports through the included links.

Start a free trial

No credit card required.

Frequently asked questions

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People ❤️ OnlineOrNot

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

Uptime Checks last week: 11.3M
Users: 3,747
Detected incidents last week: 12,390

- 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