Sentinel - AI email phishing scanner
About Sentinel - AI email phishing scanner
Sentinel is an AI-powered email phishing scanner designed to protect users from phishing attacks in Gmail and Outlook. This Chrome extension analyzes email content to detect common phishing patterns, checks suspicious links, and highlights warning signs such as fake urgency or unusual requests. It aims to support users in identifying scams and fraudulent emails while reading their emails in the browser, providing alerts when potential threats are detected.
Targeted at a wide range of users including professionals, freelancers, and everyday people, Sentinel helps individuals manage email secur…
Sentinel is a narrowly focused security tool (Chrome extension) founded in 2025 and already revenue-stage, which shows there are paying users and a working product. The combination of $143 and a 90% margin suggests the cost base is low and monetization exists, but the top-line is small and the short-term trend is slightly negative (-2%).
Traffic is extremely limited (22 monthly visitors), which points to an acquisition bottleneck: even with good conversion, the addressable funnel looks tiny today. Platform concentration on Chrome helps speed distribution but also limits reach unless expanded or paired with other channel investments. For a founder the immediate levers are clearly acquiring more users and stopping attrition; for a potential backer the core questions are durability of demand and whether growth can scale beyond this early footprint.
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— What to watch
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A judgment from project data — not a user review.
