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SMS alerts
when your
SSL certificate expires

We check SSL certificates during uptime monitoringYou get SMS alerts when SSL certificates expire

No credit card required

Trusted by thousands of businesses

Setup SMS alerts when your SSL certificates expire in seconds

OnlineOrNot checks SSL certificates as part of uptime monitoring. When you enable SSL certificate verification, we detect when certificates have expired, become invalid, or have SSL connection problems during each website check and send SMS text messages to keep you informed immediately.

Perfect for critical SSL certificates where immediate mobile notifications are essential when certificates expire or have problems. Get alerts sent directly to your phone, even when you're away from email or other communication channels.

Try OnlineOrNot now!

How to get SMS alerts when your SSL certificates expire:

Step 1

Sign up for free

Create your OnlineOrNot account in less than 30 seconds. No credit card required to get started.

Step 2

Add your phone number

Verify your mobile phone number and configure SMS alert preferences. Add multiple team members' phone numbers for important certificates.

Step 3

Add SSL certificates and get mobile alerts

Add your website URLs for uptime monitoring and enable SSL certificate verification. Receive SMS notifications when certificates expire or have issues.

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: 11.4M
Users: 3,766
Detected incidents last week: 12,283

- 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