Subject line tester

Type the subject line and preview text you are about to send. We show you exactly what each inbox shows: Gmail on a laptop and a phone, Outlook on Windows and a phone, and Apple Mail on an iPhone, with the words that get cut off marked. We check the things that quietly cost opens: a subject cut off on mobile, missing preview text, a preview that repeats the subject, shouting capitals, a merge tag that did not fill. Then you get three rewrites, each built on a different angle, that fit the phone screen in full.