Glean is the enterprise search platform that ambitious CIOs dream about: 100+ native integrations, a zero-trust security architecture, and the kind of funding trajectory that signals it won't disappear overnight. It's genuinely powerful for knowledge-intensive organizations tired of information living in silos. Nabla, meanwhile, is purpose-built for one of the most painful workflows in professional life — clinical documentation — and it executes with rare precision, earning trust from 85,000+ clinicians and hospital systems like CVS Health through rigorous certifications and an explicit no-patient-data-training policy. The meaningful difference is focus. Glean is horizontal infrastructure for enterprise knowledge work; Nabla is a vertical solution for a single, critical use case. Glean's weaknesses show up in pricing opacity and occasional accuracy gaps on complex queries. Nabla's limitations are narrower — modest API documentation depth and a thinner developer ecosystem — but neither matters much to a busy physician who just wants accurate notes. If you run a multi-department enterprise fighting information chaos, Glean is your tool. If you're in healthcare — whether you're a solo practitioner or a health system CTO — Nabla is one of the clearest ROI decisions in AI right now. They're not really competitors; they just happen to share a category label.