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EAST Anti-Phishing Tool is a free anti-phishing tool by Eye Security. GreatHorn Mailbox Intelligence is a commercial anti-phishing tool by GreatHorn. Compare features, ratings, integrations, and community reviews side by side to find the best anti-phishing fit for your security stack.
CST VerdictBased on our analysis of NIST CSF 2.0 coverage, core features, integrations, company size fit, here is our conclusion:
Microsoft 365 administrators managing credential phishing at organizations under 5,000 users will find real value in EAST Anti-Phishing Tool because the CSS-based deployment model actually stops phishing pages from rendering correctly on your own login portal, blocking the attack before users even type credentials. The free model with no per-seat licensing means you get Entra-native protection without budget negotiation; deployment takes under an hour through the portal interface. Skip this if your environment runs hybrid identity systems outside pure Entra or if you need detection and response capabilities beyond the login page itself.
GreatHorn Mailbox Intelligence
Teams running Microsoft 365 or Google Workspace who need users to actually catch phishing will find GreatHorn Mailbox Intelligence worthwhile, because the visual sender indicators and on-click URL analysis force friction into the attack chain where it matters most. The tool scores across all three NIST Detect and Awareness categories, with particular strength in DE.CM continuous monitoring and real-time risk assessment that surfaces threats before the user opens them. Skip this if your organization has already deployed a mature endpoint detection layer and expects email security to handle lateral movement detection; GreatHorn prioritizes the user reporting loop and initial threat identification, not forensic analysis of compromise.
Free anti-phishing tool for M365 that deploys via a custom CSS file in Entra.
Email security tool empowering users to identify & report phishing threats
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Common questions about comparing EAST Anti-Phishing Tool vs GreatHorn Mailbox Intelligence for your anti-phishing needs.
EAST Anti-Phishing Tool: Free anti-phishing tool for M365 that deploys via a custom CSS file in Entra. built by Eye Security. headquartered in Netherlands. Core capabilities include Credential phishing protection for Microsoft 365 environments, Custom CSS file deployment via Microsoft Entra Portal, Email-based delivery of installation instructions and CSS file..
GreatHorn Mailbox Intelligence: Email security tool empowering users to identify & report phishing threats. built by GreatHorn. headquartered in United States. Core capabilities include Visual sender and domain trustworthiness indicators, In-email banner notifications for suspicious messages, User-initiated phishing reporting capabilities..
Both serve the Anti-Phishing market but differ in approach, feature depth, and target audience.
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