Free outbound tools
Open, free, no signup. Built by the TechStack Reviews team to help you ship better outbound.
Cold Email ROI Calculator →
Calculate the real ROI and payback period of your cold email program. Inputs: volume, reply rate, meeting rate, close rate, ACV.
AI Subject Line Tester →
Score any cold-email subject line for open rate, spam risk, clarity and curiosity. Get 3 rewritten versions instantly.
Email Spam Score Checker →
Paste any cold email and get a spam score, inbox-placement estimate, and a list of every trigger to fix before you send.