Email Subject Line Tester — Score & Compare Subject Lines Before You Send
$12.97
Your subject line decides whether your email gets opened or ignored. Email Subject Line Tester scores any subject line out of 100, explains exactly why, and lets you compare two versions head-to-head before you hit send.
• Instant 0–100 score — length, numbers, questions, personalization, spam-risk words, caps and emoji, all checked in one pass
• Plain-English feedback — every point gained or lost is explained, so you learn what actually drives opens
• A/B compare mode — score two subject lines side by side and get a clear winner verdict
• Spam-word guard — flags risky words like ‘guaranteed’ and ‘act now’ before they hurt deliverability
• Mobile-length check — warns you when a line will truncate on phones, where most email is read
• History log — save scored lines in your browser and build a swipe file of what works
Your subject line decides whether your email gets opened or ignored. Email Subject Line Tester scores any subject line out of 100, explains exactly why, and lets you compare two versions head-to-head before you hit send.
WHAT IT DOES
• Instant 0–100 score — length, numbers, questions, personalization, spam-risk words, caps and emoji, all checked in one pass
• Plain-English feedback — every point gained or lost is explained, so you learn what actually drives opens
• A/B compare mode — score two subject lines side by side and get a clear winner verdict
• Spam-word guard — flags risky words like ‘guaranteed’ and ‘act now’ before they hurt deliverability
• Mobile-length check — warns you when a line will truncate on phones, where most email is read
• History log — save scored lines in your browser and build a swipe file of what works
HOW TO USE
1. After checkout, download the ZIP and unzip it.
2. Double-click email-subject-line-tester.html — it opens in any modern browser, no install, no signup.
3. Enter your details, use the tool, and copy / save / export your results.
WHO IT’S FOR
Digital nomads, online sellers, freelancers, creators and solo business owners who want a practical tool they own outright — no subscription, no login, no data leaving their machine.
WHAT YOU GET
• email-subject-line-tester.html — the complete tool in the downloadable ZIP (works offline, yours forever)
• Free lifetime updates to the file
• Instant download after checkout
