You can check the availability and uptime of SIGNL4 on this status page here: http://status.signl4.com
On the status page, you can also subscribe for incident updates via email.
We also recommend subscribing to our Twitter feed for updates and new releases https://twitter.com/signl4me
Please, note that we do not explicitly grant an SLA or availability. Nonetheless, we have achieved a much higher availability than many companies guaranteeing uptime. We believe that true performance matters more than paragraphs in a document.