Subject line checker
Test your email subject line against every major inbox client. See truncation at Gmail mobile, Apple Mail, Outlook, Yahoo. Flag spam triggers. Free, no sign-up.
Every inbox client truncates long subject lines. Gmail mobile cuts at 33 characters. Apple Mail mobile at 41. Outlook desktop at 56. Gmail desktop at 70. Yahoo at 80. If your subject line runs past the limit, recipients see your message with the first 33 characters and nothing after that.
The subject line is the single highest-leverage piece of copy in your email. It decides whether recipients open or delete. Character-count matters because most opens happen on mobile, where real estate is tight. Spam words (free, guaranteed, 100%, winner, urgent) raise your risk of landing in the Promotions tab, or worse, the Spam folder.
This is one pre-flight check. Draftship runs 35 of them, live, in the editor.
Subject length, spam triggers, contrast ratios, Gmail clipping, alt text, undeclared variables, CAN-SPAM footers. All audited as you build. Open the editor and ship an email that passes every check.
The long version
- Why your email lands in Gmail's Promotions tab (and the moves that change it)
Promotions is not spam. It is a sorting tier where 60% of marketing email goes by default and engagement runs half what it would in Primary. Here is what Gmail looks at, the levers that actually move messages between tabs, and when Promotions is the right destination.
- Apple Mail Privacy Protection broke open rates. Here is what still tells the truth.
Since iOS 15, Apple pre-fetches every tracking pixel through a proxy. Your open rate is now half Apple bots, half humans, and you cannot tell which is which. Here is how to read what is left and the metrics that still mean something.