Paste your subject line and get an instant score out of 100, plus the exact things that could hurt your open rate or send you to the Promotions tab, with how to fix each one. Nothing you type leaves your browser.
100% private. This runs entirely in your browser, nothing is uploaded or stored.
A good subject line only matters if the email lands in the inbox in the first place. Writing the emails and making sure they get read is exactly what we do for clients. Send us your last campaign and we will tell you what is really holding your opens back.
A good email subject line is short, honest and written the way you would text a friend, with no spam-trigger words, no shouting and no fake urgency. This tester scores your line on the things filters and readers both react to: spam-trigger words (free, guarantee, act now), length (aim for 20 to 50 characters so it does not get cut off on mobile), ALL-CAPS and stacked punctuation, too many emoji, and deceptive "Re:" or "Fwd:" prefixes. It is a fast sanity check before you hit send. For the deeper craft, read how to write catchy email subject lines, and to check the whole email, not just the subject, use the free email spam checker.