456 free calculators across finance, health, math, daily life, and pets — including 153 niche tools you won't find elsewhere (AI inference cost, BRRRR, yield farming, pet food portions). Two AI features set it apart: AI Finder (plain-English search across all 456) and AI Concierge (multi-step scenarios where one answer becomes the next input). No signup. No paywalls. Math runs in your browser. Forever free.