Best grammar checker for teachers

There are roughly 30-40 grammar checkers with teacher-facing claims, but only 5-7 have real traction in schools (Grammarly, Microsoft 365, Turnitin, ProWritingAid, Hemingway Editor, Quillbot). The core failure pattern: most tools optimize for professional writing, not student development—they flag errors without explaining *why* they matter or how to build better writing habits over time. Schools need integration with LMS platforms (Google Classroom, Canvas, Blackboard), real-time grading workflows, and bulk feedback capabilities that don't exist at scale. The actual gap is in the *teacher experience layer*—a vibecoder should focus on reducing marking time while increasing actionable feedback depth. Teachers want to spend less time on mechanical corrections and more on developmental comments. A new entrant wins by solving the workflow problem (batch grading, assignment templates, rubric-aligned feedback) rather than trying to out-feature Grammarly on detection accuracy.