Loops | Email Marketing Software for SaaS Teams

# Loops > Loops is an email platform for software companies. Send transactional and marketing email from one API, one contact model, and a no-code visual editor, with a free tier that doesn't expire. Built for engineers and lifecycle teams who want both developer-grade APIs and marketer-friendly tools in one place. - Docs: https://loops.so/docs - API reference: https://loops.so/docs/api-reference - For AI agents: https://loops.so/agents (skills, CLI, llms.txt, MCP) ## Email by type - [Email API for developers](https://loops.so/email-api): REST email API with typed SDKs, webhooks, and lifecycle workflows. Transactional and marketing from one endpoint, with a free tier. - [Marketing Email for Software Companies](https://loops.so/marketing-email): Send marketing email and campaigns from Loops. A clean editor, audience segments, and mailing lists built for SaaS, with a free tier that does not expire. - [Product & Lifecycle Email](https://loops.so/product-email): Send automated product and lifecycle email from Loops. Build onboarding, trial, and re-engagement workflows from your own events, free to start. - [Transactional Email Service](https://loops.so/transactional-email): Send transactional email like password resets, receipts, and login codes from Loops, with deliverability built in and a free tier that never expires. ## For AI agents and developers - [Email for AI agents: CLI, API, MCP, and skills](https://loops.so/agents): Let Claude Code, Codex, Cursor, and other coding agents install Loops, migrate an email stack, send events, and test transactional email. - [Loops REST API for AI Agents: OpenAPI Spec](https://loops.so/agents/api): Explore the Loops REST API: contacts, events, transactional email, campaigns, workflows, themes, and more, with an OpenAPI spec for client generation. - [Loops CLI: Manage Email from the Terminal](https://loops.so/agents/cli): Install the Loops CLI with Homebrew or curl and manage contacts, events, transactional email, and mailing