The #1 FREE subject line rating tool that allows marketers to test any subject line for possible deliverability and marketability issues. Provides marketing-related suggestions based on results that can improve overall open rates on emails sent. Results from this tool are based on 3 billion+ email messages that have been sent and tracked via SubjectLine.com's partners and clients.
What's new in version 3.21
SubjectLine.com App now applies over 800+ unique rules Updated rules to reflect the latest marketing research trends Performance results based on 'Marketability' and 'Deliverability' Over 3.5 Million Subject Lines checked via SubjectLine.com tool New features include advanced checks on forms of Urgency and Exclusivity.
ReleaseApril 19, 2016
Date AddedApril 19, 2016
Additional RequirementsCompatible with iPhone 3Gs, iPhone 4. iTunes account required.