Best grammar checker for consultants

There are roughly 15-25 grammar checkers with meaningful market share (Grammarly, Microsoft Editor, ProWritingAid, Hemingway, Ginger, etc.), but only 2-3 actually focus on professional business communication, and even fewer understand consultant-specific needs like client-facing tone calibration, industry terminology preservation, and compliance language. The pain point isn't grammar detection—it's false corrections that make consultants sound robotic or misunderstand context-dependent phrasing. Most tools optimize for simplicity and brevity, which contradicts consulting's need for nuance, qualification, and strategic hedging. The gap exists in vertical-specific customization: a grammar checker trained on actual consulting decks, proposals, and reports would catch real errors (ambiguity, weak passive constructions, contradiction) while ignoring false positives around 'which vs. that,' jargon, and intentional complexity. A founder entering this space should focus on three things: (1) build a custom dictionary of consulting terminology and industry frameworks so the tool stops correcting 'EBITDA' or 'best practice,' (2) create tone profiles for different audience types (C-suite vs. frontline vs. client-facing), and (3) integrate directly into the tools consultants already use—Google Docs, Word, Slack—rather than asking them to switch platforms or copy-paste.