KnowBe4 vs Island
Side-by-side comparison of AI visibility scores, market position, and capabilities
KnowBe4 is the world's largest security awareness training platform, delivering simulated phishing, compliance training, and human risk management to 65,000+ organizations.
About
KnowBe4 is a cybersecurity company headquartered in Tampa, Florida that operates the world's largest security awareness training and simulated phishing platform, serving over 65,000 organizations across 11 million users. Founded in 2010 by Stu Sjouwerman, the company was built on the thesis that the human element — employees who click phishing links, reuse passwords, and inadvertently install malware — represents the primary attack vector in the majority of successful breaches, and that continuous, measurable security awareness training combined with simulated phishing exercises is the most effective way to reduce this human risk. KnowBe4 went public in 2021 and was taken private by Vista Equity Partners in 2023 in a transaction valued at approximately $4.6 billion.
Island built the first enterprise browser with built-in security, DLP, and governance; raised $250M Series E at ~$5B valuation (Mar 2025) with $730M total; serves 450 enterprise customers including Mattress Firm and Swiss Life.
About
Island is a Dallas, Texas-based cybersecurity company that developed the Enterprise Browser — a Chromium-based web browser purpose-built for enterprise security, compliance, and IT governance. Founded to address the reality that nearly all enterprise work now happens in the browser, Island''s platform provides security and control at the browser layer: including data loss prevention (DLP), web filtering, session recording for compliance, application access control, and identity integration — without requiring VPNs, SASE solutions, or endpoint agents for many use cases.
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