Email subject line tester
Paste a subject line and preview text to see a live inbox preview and quick checks for length, spam trigger words, caps, and emoji.
74/ 100
Good· 5/6 checks pass
This scores writing quality. It can't predict opens, so test your winners on clicks.
31 chars · 7 words
59 chars
What the inbox sees
Fits the cut
Your 31-char subject fits Gmail mobile (cuts at ~33).
Note · Lead with the hook anyway. Most mobile inboxes show about 33 characters.
Length
31 chars · 7 words. In the sweet spot.
Preview text
59 chars. Complements the subject without repeating it.
Specificity
Concrete and relevant. It has a number and speaks to the reader.
Personalization
Token detected. A long name could push you past the mobile cut, so always set a fallback.
Tone
Calm and clear, with no shouting, hype punctuation, or fake urgency.
Beyond the subject line
Placement is mostly about sending reputation, not words. Loops handles authentication, list hygiene, and unsubscribes automatically.
Your subject fits Gmail mobile, so nothing gets cut.
The orange line marks the cut · faded text is hidden in that inbox.