Best Email Template Design Software for Unstack

ActiveCampaign combines over 250 professionally designed templates with AI content and image generation so teams can launch beautiful, on‑brand campaigns fast. Drag‑and‑drop editing, mobile‑responsive layouts, and reusable blocks keep design consistent, while testing and optimization tools help every template drive results over time.

Klaviyo is the AI-first B2C CRM platform that helps you grow by integrating marketing, analytics, and customer service in one solution. Powered by unified data and built-in AI, it's faster and easier than ever to create personalized, lasting customer relationships. Klaviyo unifies your customer profiles by capturing every event, and then lets you orchestrate your email marketing, SMS marketing, push notifications, WhatsApp, and RCS campaigns in one place. Built-in AI agents plan and launch campaigns, personalize every send, answer questions, and resolve issues. With real-time attribution and insights, you'll be able to make smarter, faster decisions that drive ROI. Trusted by more than 170,000 businesses, Klaviyo can grow your business while keeping operations simple and customer relationships strong

Mailchimp is a marketing automation platform boasting 11 million users worldwide to personalize every email and SMS for every customer using AI-powered insights and content creation tools. With a 99% delivery rate and over 300 integrations, Mailchimp helps businesses connect with their customers, foster repeat business, and build lasting brand loyalty while fitting into their existing workflows. Businesses including TEDTalks, Shutterstock, Boston Market, Nikon India use Mailchimp to drive revenue through emails. Founded in 2001 and based in Atlanta with offices in Brooklyn, Oakland, Vancouver, London, Seattle, and Santa Monica. In 2021 Mailchimp was acquired by Intuit Inc. (Nasdaq: INTU), the global financial technology platform that makes Intuit TurboTax, Credit Karma, QuickBooks, and Mailchimp. Since then, the company has released 100+ new features to help its customers.