AngerAlert is an email sentiment monitoring service from Appfluence Inc. that helps businesses identify frustrated customers and respond before concerns escalate. Its system automatically analyzes incoming messages for frustration-related keywords, tone patterns, and escalation signals, with the site reporting 94% detection accuracy. When it flags an email, AngerAlert applies an “Angry” or “Concern” label in Outlook or Gmail and can send an alert to Slack or Microsoft Teams within 30 seconds, giving staff a prompt opportunity to act.

Getting started involves connecting an Outlook or Gmail account through one-click authentication. Users can set custom processing rules, align analysis with their business processes, and review flagged messages in a dashboard. The service is designed to support faster responses, customer retention, and the recovery of at-risk customer relationships. AngerAlert presents its workflow in four steps: connect an email account, analyze messages automatically, monitor flagged emails, and respond quickly to urgent situations. Its stated goal is to help organizations turn negative customer experiences into stronger relationships through timely communication.