Startup Growth Model Builder

Growth Model Summary: Checkmate's core loop is a community-driven referral flywheel — trainers who achieve strong client retention become visible proof cases in the same communities they were recruited from, driving new signups without incremental ad spend. The compounding mechanism is client outcome data accumulating over time, making power users both stickier and more effective referral sources simultaneously. Acquisition Layer: Primary channel is direct outreach and organic posting in fitness trainer Facebook Groups. Estimated CAC is $85–120 based on 3–4 hours of founder time per converted customer at current stage. The single acquisition signal that matters: qualified trial starts per week. North Star Metric: Active clients under management across all paying trainers — defined as clients who completed at least one check-in in the past 7 days. This metric captures trainer retention, client engagement, and platform growth simultaneously; when it grows, revenue follows, and when it stalls, churn is 30 days behind it. Constraint 1: Founder-led outreach does not scale past 150 customers — the acquisition model must shift to content-led organic or partner channels before $15K MRR or growth flattens. Mitigation: Begin building SEO content around 'personal trainer software' queries in parallel with direct outreach now, not after the channel constraint hits.