Canva

Canva is a versatile online design platform that allows users to create a wide range of visual content, including e-cards, using an intuitive drag-and-drop editor. It provides a vast library of templates, stock photos, and graphics, enabling extensive personalization. Users can share their designs digitally or order physical prints.

Canva is a strong match for the GreetsU concept. It offers a comprehensive eCard maker with a vast library of templates for various occasions, a robust personalization editor allowing for custom messages, photos, colors, and fonts. Users can easily share their creations via social media or download them. While it doesn't explicitly mention animated envelope reveals or user accounts for saving specifically for e-cards, the general functionality of Canva supports saving designs and sharing, and it does offer animation tools for elements within the card. The platform is also responsive and offers occasion categories and background themes.