UnlimitedMessaging centralises WhatsApp and email in one place. Developers get a REST API, real-time webhooks (delivered, read, replied) and Python/Node.js SDKs. One API call sends via WhatsApp, email, or both at once. The built-in CRM handles the rest: segment your audience, view conversation threads per contact, track delivery and read status, and reply directly from the interface. No per-message fee. No vendor lock-in.