Email Subject Line Power Scorer
Marketing EmailScore email subject lines for length, spam triggers, power words, and mobile preview fit — compare A/B variants with CSV export. 100% client-side.
Email subject line power scorer
Top variant
Your weekly privacy toolkit — 3 new browser utilities inside
Score
79
Mobile preview (~35 chars)
Your weekly privacy toolkit — 3 ne…
Desktop preview (~60 chars)
Your weekly privacy toolkit — 3 new browser utilities inside
Length is acceptable
60 characters — preview carefully on mobile clients.
Power words detected
new, your
No obvious spam triggers
Subject avoids common filter phrases.
Variant 2
ACT NOW!!! 100% FREE CASH CLICK HERE WINNER LIMITED TIME!!!
Score
0
Mobile preview (~35 chars)
ACT NOW!!! 100% FREE CASH CLICK HE…
Desktop preview (~60 chars)
ACT NOW!!! 100% FREE CASH CLICK HERE WINNER LIMITED TIME!!!
Length is acceptable
59 characters — preview carefully on mobile clients.
Power words detected
free, limited
Spam trigger language
act now · cash · click here · limited time · winner · 100% · Multiple exclamation marks · All caps subject
Heavy capitalization
100% uppercase letters may hurt deliverability.
Multiple exclamation marks
One exclamation at most is safer for promotional sends.
Heuristic scoring only — real open rates depend on list quality, sender reputation, timing, and inbox placement. Use as a pre-send checklist, not a deliverability guarantee.