Letro is an AI-powered email designer that turns plain-English prompts or uploaded screenshots into production-ready MJML/HTML templates in seconds, automatically extracting and applying your brand colors, fonts, logo, and tone of voice; its generative AI also uses a RAG-powered knowledge base of brand docs to keep copy and content accurate. You can visually edit or scope AI edits to individual blocks, drag-and-drop components, store assets in a media library, and export ESP-ready HTML/MJML to Mailchimp, Klaviyo, SendGrid and others—ideal for marketers and developers who want fast, consistent, code-free email templates with AI-driven brand consistency and screenshot-to-email reconstruction.