About Subject Line
SubjectLine.com, the #1 ranked free email subject line grading tool, has exceeded 10 million subject lines tested. The free online marketing support tool includes over 900 unique rules that are applied throughout the...
SubjectLine.com, the #1 ranked free email subject line grading tool, has exceeded 10 million subject lines tested. The free online marketing support tool includes over 900 unique rules that are applied throughout the subject line testing process. Marketers have the ability, for free, to test any subject line for possible deliverability and marketability issues that could impact overall campaign results.
· Over 10 Million Subject Lines checked via the SubjectLine.com tool · Updated rules to reflect the latest marketing research trends · Performance results based on 'Marketability' and 'Deliverability' · SubjectLine.com App now applies over 900+ unique rules
Previous Versions
Here you can find the changelog of Subject Line since it was posted on our website on 2023-06-27 15:00:55.
The latest version is 3.9.1 and it was updated on 2026-06-16 23:03:35. See below the changes in each version.
Subject Line version 3.9.1
Updated At: 2021-01-25
Changes: · Over 10 Million Subject Lines checked via the SubjectLine.com tool
· Updated rules to reflect the latest marketing research trends
· Performance results based on 'Marketability' and 'Deliverability'
· SubjectLine.com App now applies over 900+ unique rules
Subject Line version 3.9.1
Updated At: 2021-01-25
Changes: Jan 25, 2021
Version 3.9.1
· Over 10 Million Subject Lines checked via the SubjectLine.com tool
· Updated rules to reflect the latest marketing research trends
· Performance results based on 'Marketability' and 'Deliverability'
· SubjectLine.com App now applies over 900+ unique rules
Disclaimer
Official App Store Link
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