Website monitoring done the right way

Find peace of mind knowing that your websites are up and running.

But when things go haywire, be the first to learn about it.

Start your free 14 day trial

To this day, Hexadecimal has run more than 2,500,000 uptime and certificate checks!

Uptime monitoring

Monitor websites and APIs from multiple continents, every minute. Be the first to know when something goes south.

Certificate expiry checks

When calendar reminders and hacky shell scripts won't cut it anymore. No more expired TLS certificates.

Peace of mind

You shouldn't be up at night because your monitoring software is throwing false alerts left and right.

Resolve downtimes faster

Instead of getting generic “your website is down, go figure” message, receive actionable debugging information, just when you need it the most.

Versatile alerting

Multiple recipients? Check. Alerts delivered via email, SMS, and Slack? Check. Recurring notifications? Check. False alerts? No.

Team accounts

Bring over your team members by emailing them a link. You know that sharing credentials over pastebin is a Bad Thing, right? Right?

Hands-on support

Instead of receiving canned, robotic responses to your questions, get helpful, timely responses from the founder. Your emails won't end up in /dev/null.

Wide range of protocols

Living on the bleeding edge? From TLS 1.3 to HTTP/2 to IPv6, you have got yourself covered. Using legacy software? You are covered as well.

Respecting your privacy

There are no advertising beacons, tracking pixels, or other voodoo on this website. Ditto for all emails sent by Hexadecimal. You won't see annoying cookie notices around here, because cookies are used for what they were intended to, instead of snooping on you.


Getting out should be as easy as getting in, that's why you can permanently delete all your data with a click of a button. You won't be pestered with obnoxious popups trying to harvest your email. If you aren't satisfied with the service within 30 days, you get your money back, no questions asked.

Quick tour

Get up and running in seconds. Literally.

Start your free 14 day trial

No hidden fees, no tracking, no ads, no dark patterns, no shenanigans, no snake oil.