GroupGreeting

GroupGreeting is an online platform specializing in digital group greeting cards, primarily for workplace use. It allows multiple people to sign a single ecard, personalize it with messages, photos, and GIFs, and then deliver it virtually. The service aims to simplify the process of coordinating group cards for various occasions.

GroupGreeting is a strong match for the GreetsU concept. It offers a wide selection of ecard designs, allows for personalization with messages, images, and GIFs, provides a shareable link for multiple signers, and supports user accounts for saving cards. It also categorizes cards by occasion and offers social sharing options. While it doesn't explicitly mention animated envelope/card reveals or background themes, its core functionality aligns very well with the must-have features and several 'other' features.