Best Sentry alternative for uptime monitoring
Free 14-day trial · No credit card required
Trusted by thousands of businesses
Why Sentry users need OnlineOrNot
Sentry doesn't monitor uptime. While Sentry is excellent for error tracking and performance monitoring, it can't tell you when your website or API is completely down or unreachable.
Catch outages before error floods. OnlineOrNot alerts you the moment your site goes down, before users start hitting errors that flood your Sentry dashboard.
Monitor what Sentry can't. OnlineOrNot monitors cron jobs, scheduled tasks, SSL certificates, and external APIs - giving you complete visibility beyond your application code.
Why pick OnlineOrNot
over Sentry?
| Key Features | Sentry | OnlineOrNot |
|---|---|---|
| Uptime monitoring | No | Yes |
| Multi-location verification | No | Yes |
| Cron job/scheduled task monitoring | No | Yes |
| SSL certificate monitoring | No | Yes |
| API endpoint monitoring | Performance only | Uptime + Performance |
| Error tracking | Excellent | No |
| Performance monitoring | Excellent | No |
| Custom status pages | No | Yes |
| Team collaboration | Error-focused | Uptime-focused |
| Alert fatigue prevention | Basic | Multi-location verification |
Perfect companions for complete monitoring
Sentry + OnlineOrNot = Complete coverage. Use Sentry to track application errors and performance issues, while OnlineOrNot ensures your services are online and accessible.
Better incident management. Know immediately if an issue is "the site is down" (OnlineOrNot) or "there's a bug in the code" (Sentry). This context makes debugging much faster.
Proactive vs reactive. OnlineOrNot catches outages before users are affected, while Sentry helps you fix issues after users encounter them. Together, they cover the full monitoring spectrum.
Add uptime monitoring to your Sentry workflow:
Set up OnlineOrNot monitoring
Add your websites, APIs, and cron jobs to OnlineOrNot. Configure checks every 30 seconds with multi-location verification to eliminate false positives.
Configure complementary alerts
Set up OnlineOrNot to alert for uptime issues, while keeping Sentry for error tracking. Route alerts to the same incident management tools for unified response.
Get complete monitoring coverage
Now you have uptime monitoring (OnlineOrNot) + error tracking (Sentry). Catch outages before they happen and debug issues faster with complete context.
No credit card required.
Incidents happen.
Get alerted immediately.
OnlineOrNot detects problems and lets your team know before your customers do.
- Reliable alerts where you need them:
- SMS
- Slack/Discord
- Microsoft Teams
- Incident.io/PagerDuty/OpsGenie/Grafana OnCall/Spike
- Webhooks
30-second setup.
Simple to setup,
yet deeply configurable.
You don't have to be an engineer to set it up.
Simple and effective monitoring that lets you sleep a bit better at night.
Also, I just want to thank you for your responsiveness and help.
This is the best uptime monitoring we have seen so far and saved us a ton of time building our own version.
— Engineering manager, SaaS company
- Super-fast checks.
- Check as often as every 30 seconds, and catch the issues that take your website down for less than a minute.
- Configurable HTTP requests.
- You can configure the HTTP method, headers, and body for each check.
- Instant alerts.
- Alerts in the tools you already use: Email, SMS, Slack, Discord, Incident.io, PagerDuty, OpsGenie, Grafana OnCall, Spike, and more.
- No false positives.
- OnlineOrNot runs every check at least twice before sending an alert, with options for even more.
- SSL Monitoring.
- OnlineOrNot will check your SSL certificates for expiration and other issues, and alert you if there's a problem.
- Geo-specific & Multi-location Checks.
- You can choose to run uptime checks from one region, or all of them.
Build trust.
Keep your customers informed
Your customers rely on your products and services. Let them know your real-time status with an automatically updating status page.
- Minimize support load.
- Add your customers as subscribers to your status page, and send consistent incident updates via email.
- Private status pages.
- Share internal status updates with your teammates and internal stakeholders with a private status page.
We pitch our website to investors and influencers all the time. If the website is down, we look like amateurs.
We know our website is online before these important meetings thanks to OnlineOrNot.
— early start-up founder
Frequently asked questions
Trusted by software teams worldwide
OnlineOrNot is built for scale and runs millions of uptime checks every week. Thousands of software teams, including some of the world's leading brands have already made the switch from other uptime monitors.
- Uptime Checks last week
- 15.2M
- Users
- 5,480
- Detected incidents last week
- 803
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 HMaker 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 BentoumiFounder 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 BowlesFounder 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 LeaFounder 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 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
OnlineOrNot does the job for me.
Charles MillerSoftware Architect at Atlassian
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