Shary - Place a call to action in every link you Share. Free Forever
HTMLEmail.io - Responsive HTML email templates for startups & developers
Linkiro - Increase your conversion rate! Add a call-to-action to links you share
Startup Emails - Responsive HTML email templates for startups
Rite.ly - Rite.ly is a Call-to-action (CTA) header that can be used in any page.
Stripo - Stripo is an all-in-one email design platform. We enable our clients to build emails of any complexity, including interactive AMP emails, really fast and easy.