Amplitude is a mature digital analytics platform built to tell you exactly how users behave inside your product — where they drop off, what drives conversion, and which segments are worth chasing. Its AI layers predictions on top of clean event data, and its chart flexibility means analysts and non-technical marketers can both get value without a PhD. Glean tackles a completely different problem: the organizational chaos of information scattered across dozens of SaaS tools. It uses AI search to unify all that content and give employees instant, cited answers — think of it as a brilliant internal search engine that actually knows your company's context. The meaningful difference is audience and access. Amplitude is built for product and growth teams analyzing customer behavior; Glean is built for IT and ops leaders solving enterprise knowledge fragmentation. Amplitude's learning curve is real but manageable; Glean's onboarding is smoother but its pricing wall is steep. Choose Amplitude if you're optimizing a digital product, running growth experiments, or need analytics your whole team can actually use without a consultant. Choose Glean if you're a 500-plus-person organization where employees spend hours hunting for internal information and you have the budget to solve it properly.