Browser checks for your critical pages

Your server might be responding, but can your customers actually load your page? OnlineOrNot's Browser Checks verify that your most business-critical pages still work.

OnlineOrNot's browser check dashboard view containing charts of page response time

Cool screenshot, but what does this actually do?

Let me provide a bit of context: OnlineOrNot builds website monitoring tools - the first of which was a simple* uptime checker.

After running a few million checks, my customers started asking why I didn't support Single Page Applications (SPAs) like React - and the answer was pretty simple: the basic uptime checker just fetched the page, it didn't render anything.

OnlineOrNot's Browser Checks feature is how we solve that problem - by plugging Google's Puppeteer and real Chrome browsers into OnlineOrNot's existing uptime monitoring service, you can now reliably check whether your React (or Vue, or Angular, or whatever comes next) apps successfully render, and display the text you expect.

Max Rozen, creator of OnlineOrNot

Tired of unreliable, slow, extremely "enterprise software"-feeling monitoring apps, I built OnlineOrNot to get false-positive-free alerts whenever anything goes wrong with my client's websites.

Max Rozen

Creator of OnlineOrNot

So you run Puppeteer in the cloud... can you run my Puppeteer scripts for me?


My aim for this Browser Checks feature is to allow Puppeteer test scripts to be added, and have the service send you screenshots of your app when things go wrong.

To start with however, Browser Checks currently supports:

  • Loading your web app
  • Searching for text on the page
  • Retrying, and waiting for several failed checks before alerting
  • Sending alerts to Email, Slack, SMS, and Webhooks when things go wrong

*Turns out running millions of uptime checks per week isn't as simple as you'd think!


Real Browsers

Browser Checks are run in real Chrome browsers, isolated from each other for extra security.

Verified Alerts

Each failed check gets retried, and re-checked in separate regions before sending you an alert.

Alerts where you need them

Get notified when your check starts failing and when it works again via SMS, Email, Slack, and Webhooks.

Text Search

Search your page for text to catch blank pages that don't display obvious errors (such as React, Vue and Angular apps)

Global Monitoring

Monitor from any one of 18 major cities around the world. Check out our supported regions.

Bring the whole team

Monitoring is your whole team's job, not the responsibility of just one person. Bring your whole team at no extra cost.

What others are saying about OnlineOrNot

Want to show your love?
Tweet at @RozenMD or @Online_Or_Not

  • I'm using @Online_Or_Not 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!
  • I just set up some site aliveness checks for @Archium_io with @RozenMD's Took me less than five minutes and it was completely self-explanatory, not to mention gorgeous. Seriously good experience. Great job, Max! 👏👏

Last week kept us busy

With plenty of room for more pages to check, incidents to catch, and notifications to send

Pages checked
Incidents caught
Notifications sent

Ready to use OnlineOrNot?

Get started on our free tier with outage alerts via Email and Slack.

No time limit, and no credit card required.