You can use Google Analytics Custom Alerts to send yourself emails whenever a specific traffic segment drops below (or above) a threshold you set. 

[Details onhow to setthatupcan be foundhere](https://support.google.com/analytics/answer/1033021?hl=en)

[Learnhow to set upemail alertshere](https://support.google.com/analytics/answer/1033021?hl=en){:target="_blank"}.

*[Mixpanel email reports](https://mixpanel.com/blog/2011/04/14/email-reports/)

*[Amplitude email alerts (scroll down a bit)](https://amplitude.com/blog/2015/03/20/new-features-stickiness-team-access-controls-email-alerts-redshift-playbook/)

Chartbeat and GoSquared both offer awesome real-time dashboards to see what's happening right now on your site. They both include the option to get notified when your traffic hits a certain threshold. For example, if your on-site visitors is less than 100 people, or more than 1,000.

*[Chartbeat Spike Alerts](http://blog.chartbeat.com/2011/08/11/newsbeat-introducing-spike-alerts/)

*[GoSquared Traffic Spike Alerts](https://www.gosquared.com/customer/portal/articles/1036771-traffic-spike-alerts)

*[Chartbeat Spike Alerts](http://blog.chartbeat.com/2011/08/11/newsbeat-introducing-spike-alerts/){:target="_blank"}

*[GoSquared Traffic Spike Alerts](https://www.gosquared.com/customer/portal/articles/1036771-traffic-spike-alerts){:target="_blank"}

Note: GoSquared also offers in-depth historical and user analysis. Chartbeat sticks to realtime anonymous traffic, but offers some sweet features for publishers.

The last optionwe recommend is to use a monitoring tool like [PagerDuty](https://www.pagerduty.com/) or [Data Dog](https://www.datadoghq.com/) and pointour [webhooks](/docs/connections/destinations/catalog/webhooks/) destination at them. That way you can set up custom alerts in their system.

The last optionSegment recommends is to use a monitoring tool like [PagerDuty](https://www.pagerduty.com/){:target="_blank"} or [Data Dog](https://www.datadoghq.com/){:target="_blank"} and pointSegment's [webhooks](/docs/connections/destinations/catalog/webhooks/) destination at them. That way you can set up custom alerts in their system.

The last option for alerting based off of Segment events is to use one of the email tools available on the Segment platform that offers event-triggered emails. Your options there are Customer.io, Vero, Autopilot, Outbound, Klaviyo, or Threads.