Watsail is a WhatsApp marketing platform that runs on your OWN Meta WhatsApp Business API — so Meta bills you for messages directly, with zero markup. No per-message margin, ever. What makes it different: Keep your number — WhatsApp Coexistence runs your Business app + the API together (no migration, no losing chats) Campaigns, broadcasts, automation, chatbot & team inbox in one place Built for SMBs and agencies. No setup fee. 14-day free trial.