Harvey Legal AI Approaching 50% DAU/MAU — SaaStr Declares DAU/WAU/MAU the New Lighthouse Metric for B2B+AI

SaaStr·high signal

Harvey, the legal AI company, is approaching a 50% DAU/MAU ratio with 12 hours monthly per average user and 6x YoY net new ARR growth. For context, most successful B2B tools operate at 10-20% DAU/MAU. SaaStr argues this signals a structural shift: engagement metrics now predict business success better than ARR/NRR because zero switching costs mean users can 'spin up a replacement workflow in an afternoon.' Stealth churn — products dying 6-18 months before cancellation signals appear — is the hidden risk.