Test your spintax before sending emails. Free previewer that works with Lemlist, Smartlead, Instantly, Woodpecker, Gmass, and Saleshandy. See all variations instantly, catch errors, and export your email variations. No signups, data never leaves your browser.

TRT Sync is the all-in-one app built to take the guesswork out of Testosterone Replacement Therapy. The goal is simple: help you stay consistent, understand your body's response, and have more productive conversations with your doctor.