We alert you
when your API goes down.

Before OnlineOrNot: Customers tweeting you, emailing you, calling you, wondering why your website doesn't work.
With OnlineOrNot: Reliable downtime alerts (for you/your customers), letting you fix issues before they impact your reputation.
See Plans and Pricing

No time limit, and no credit card required.

Options for all types of requests

Want to test that your GraphQL API only responds to POST requests, and refuses GET requests? No worries.

Want to double check that your REST API rejects unauthenticated requests, the way you expect it to? Too easy.

Configure your API monitoring as you need, and OnlineOrNot will do the rest.

OnlineOrNot's Quick to configure uptime checks

Alerts where you need them

Need to be absolutely sure we can reach you when things break? OnlineOrNot can send alerts via:

  • Email
  • SMS
  • Slack/Discord
  • Webhooks
OnlineOrNot sends alerts via Email, SMS, Slack, Discord, Webhooks, and more to come.

Monitor correctness too

Your servers are responding, but is the data correct? Our powerful assertions feature helps you keep track of the data your API sends.

OnlineOrNot's API assertions

What others are saying about OnlineOrNot

Don't just take our word for it, see what our customers think.

    • Bet on indie hackers 🚀

      Tried @RozenMD's OnlineOrNot uptime monitoring, and for a few days got notifications of 2min down time.

      Thought that his tool was wrong as uptime robot didn't reported those downtime.

      Turned out it was the other way.

      Khaled Bentoumi
      Founder of Data to Page
    • OnlineOrNot does the job for me.

      Charles Miller
      Software Architect at Atlassian
    • 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
Ready to get going? Let's go:

No time limit, and no credit card required.