CTOR climbed from 3.1 to 7.4 percent in 90 days.
A 90-person B2B SaaS company was running nurture at a reported 36 percent open rate (industry average) and 3.1 percent CTOR (industry low-ish). Three changes drove the lift. First, segment-specific subject lines drafted by Strkr AI across six engagement cohorts, which lifted real-human open rate 11 points. Second, per-recipient timezone sending, which added another 2 points. Third, suppressing the 180-day unopens, which lifted inbox placement 14 points. Within 90 days, real-human open rate climbed to 42 percent and CTOR to 7.4 percent. Pipeline sourced from nurture doubled over the same window.