Tellwing is email marketing priced by what you send, not by how many contacts you have. One account covers email campaigns, transactional email, SMS and (soon) WhatsApp, all on the same contact lists. Marketing teams get a drag-and-drop builder, automations, forms, pop-ups and landing pages; developers get a simple REST API with idempotent sends, webhooks and examples in curl, JavaScript, Python and PHP. Tellwing connects with Shopify, WooCommerce, Zapier, Make and n8n, and has a free plan with 500 emails a month and no card required.