Overview
Buttondown is a hosted newsletter and publishing service for writing, sending, and archiving email. It supports Markdown and visual editing, reusable snippets, subscriber imports, tags, scheduled messages, paid subscriptions, archive controls, analytics exports, and integrations through its REST API. The company documents AI use inside its own stack, including Anthropic models for alt-text generation, content assistance, and coding, while also choosing not to provide an official SDK or MCP server. Buttondown is proprietary; developers can use the public API and OpenAPI description rather than self-hosting the product.