Litmus

Litmus, now part of Validity Engage, is an email marketing platform that provides tools for email design, building, testing, monitoring, personalization, and deliverability. It integrates with major email service providers including Mailchimp, HubSpot, Klaviyo, Adobe Marketo, Salesforce Marketing Cloud, and others. The platform serves thousands of brands across all sizes and industries, offering features like preview testing across 100+ email clients, 24/7 email monitoring, live email analytics, and contact data quality tools.