Glean is an enterprise knowledge layer — it connects to 100+ apps and uses AI to surface the right information regardless of where it lives. It's genuinely powerful for large organizations where information silos are costing productivity. Gong is a revenue intelligence platform — it records, transcribes, and analyzes sales conversations to help teams close more deals, coach reps faster, and forecast with confidence. Both are well-funded category leaders with serious enterprise pedigrees. The critical difference is specificity. Gong solves one problem — sales performance — and solves it deeply, with 6,000+ reviews and broad CRM ecosystem integration proving real adoption. Glean solves a broader, harder-to-quantify problem: organizational knowledge fragmentation. Gong's ROI story is easier to tell to a CFO; Glean's requires more change management and executive buy-in. Sales-led organizations with active deal cycles, coaching needs, or forecast accuracy problems should choose Gong without hesitation. Companies with 500+ employees struggling with information overload, slow onboarding, or scattered documentation should evaluate Glean. They rarely compete directly — if you're a scaling sales team, you might eventually need both.