Klaviyo
The intelligent customer data platform for automated e-commerce growth.
The industry-standard email testing and optimization platform for high-performance marketing teams.
Litmus is a comprehensive email marketing quality assurance and analytics platform that serves as the critical pre-flight layer for enterprise communication. By 2026, Litmus has transitioned from a screenshot-focused utility into an AI-powered optimization engine that ensures message integrity across 100+ email clients and devices. The platform's technical architecture revolves around 'Litmus Builder,' an integrated development environment that provides real-time rendering as code is updated. Its 'Litmus Proof' module centralizes stakeholder feedback, replacing fragmented email chains with a unified review system. A major differentiator in its 2026 market position is its deep vertical integration with leading ESPs like Salesforce Marketing Cloud, Adobe Journey Optimizer, and Braze, allowing for a seamless sync of optimized templates without manual exports. Litmus leverages machine learning to predict spam filter behavior and suggests proactive accessibility remediation, ensuring campaigns are inclusive and deliverable. For organizations where email ROI is paramount, Litmus provides granular engagement metrics, such as time spent reading and heatmaps, which go beyond simple open and click rates, offering a sophisticated view of subscriber behavior in a privacy-first world.
A centralized review tool allowing collaborators to pin comments directly to specific design elements in the email preview.
The intelligent customer data platform for automated e-commerce growth.
Premium email verification and deliverability suite for high-volume enterprise senders.
The intelligent CRM and automation platform that converts leads into lifelong customers through AI-driven sales orchestration.
The all-in-one AI-driven marketing engine for building, launching, and scaling digital businesses.
Verified feedback from the global deployment network.
Post queries, share implementation strategies, and help other users.
Automated scanning of HTML for ARIA roles, alt text, and color contrast ratios (WCAG 2.1 compliance).
Bi-directional API bridge between Litmus and platforms like Salesforce Marketing Cloud or Oracle Eloqua.
Runs emails through 25+ real-world filters and checks domain/IP against 100+ blacklists.
Proprietary rendering logic to detect and fix inverted colors or 'ghosting' in dark mode clients.
Tracking pixel integration that captures 'time spent reading' and 'forwarding' events.
Cloud-based IDE for email development with Emmet support and instant client-side rendering.
Emails looking broken in specific versions of Outlook or Gmail.
Registry Updated:2/7/2026
Finalize sync.
Ensuring emails are readable by visually impaired subscribers to meet legal requirements.
Emails consistently landing in the 'Promotions' or 'Spam' folders.