We alert you
when your API goes down.
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.

Alerts where you need them
Need to be absolutely sure we can reach you when things break? OnlineOrNot can send alerts via:
- SMS
- Slack/Discord
- Webhooks

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.

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 BentoumiFounder of Data to PageOnlineOrNot does the job for me.
Charles MillerSoftware 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 LeaFounder of Archium.ioOnlineOrNot 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 SaxenaFounder 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 BarclayFounder of Cloakist