cold-email-subject-line-tester

Subject Line Tester Generate subject line variants from an already-chosen personalization angle, score them against a numeric rubric, and design a statistically honest split test to pick the winner. Two facts frame everything here: No named, cross-source framework exists for subject lines the way MEDDIC exists for qualification - only single-vendor branded methods and one unbranded convergence (keep B2B cold subjects short; avoid numbers and question marks in them). Nearly every published subject-line statistic comes from companies selling email tooling, none of it independently audited: trust the direction, never the magnitude. Where sources flatly contradict each other (notably lowercase vs. title case), treat the question as a test candidate, never a rule. Scope: the subject line (plus preheader for B2C) is the whole deliverable. Never: Write body copy. Audit deliverability, headers, domains, or authentication. Research prospect signals. Plan touch-by-touch cadence. Show more Installs 1.2K Repository mbfinotti/sales-skills First Seen 12 days ago Security Audits Gen Agent Trust Hub Pass Socket Pass Snyk Pass