Respondable

Respondable is an AI-powered email writing assistant that analyzes message drafts and provides real-time suggestions to improve open rates, click-through rates, and overall email effectiveness. Originally developed by Boomerang, it integrates directly into Gmail and Outlook, helping marketers, sales professionals, and business communicators optimize subject lines, tone, and content structure based on predictive analytics.

Respondable operates on a freemium model. The free version provides basic email analysis and limited suggestions per month. Paid plans unlock unlimited analysis, advanced insights, detailed performance predictions, and priority support. Exact pricing varies by subscription tier and is available through direct inquiry on their website or through bundled Boomerang packages.