Our monitors picked up what looks like a possible service issue with CircleCI early on 18 April 2026, and we wanted to share what we're seeing in case it's useful for you.
What Our Monitors Are Showing
At 04:36 UTC on 18 April, our uptime checks detected an HTTP 500 server error when reaching CircleCI's main service. A 500 error typically suggests something went wrong on CircleCI's side — it's the kind of response that usually means the service is either experiencing unexpected load, a deployment issue, or some kind of internal problem.
From what we can see, this appears to have been a transient issue, but we don't have a full picture yet of how widespread it was, how long it lasted, or what triggered it. As an independent monitoring service, all we can share is what our own checks detected at that moment in time.
We've checked CircleCI's official status page, and we'd recommend keeping an eye there for the most authoritative information about what happened and whether it affected your workflows.
What You Can Do in the Meantime
If you rely on CircleCI for CI/CD pipelines and you're concerned about reliability:
- Check the status page first — CircleCI's status dashboard is the best source for real-time updates and incident history
- Review your monitoring setup — if CircleCI is critical to your workflow, consider setting up alerts for yourself so you catch issues early
- Have a fallback plan — if builds are blocked, it's worth thinking ahead about how your team would respond (pause deployments, notify stakeholders, etc.)
- Check recent build logs — if you had builds running around that time, there might be clues in the logs about whether they were affected
Keep an Eye on CircleCI with Uptrue
If you'd like to keep your own tabs on CircleCI's uptime — or any other service that matters to your business — you can add it to your monitoring dashboard for free at https://uptrue.io. It's a straightforward way to get notified if something like this happens again, rather than finding out from your team Slack or noticing builds failing.
The Bottom Line
What we're sharing here is what our monitors detected at a specific moment on 18 April. The situation may have already resolved, or there might be more context we're not yet aware of. For the definitive story on what happened, how many users were affected, and the current status, CircleCI's status page is your best source.
We'll keep watching — that's what we do. And if you'd like to keep watching too, we're here to help.