Thankbox

Thankbox provides an online platform for creating personalized group greeting cards for various occasions. Users can add messages, photos, GIFs, and videos, and also collect money for a group gift. The service is designed for both personal and business use, offering features like scheduled sending and team management.

Thankbox is a strong match for GreetsU. It offers a platform for creating online greeting cards with a wide variety of templates for different occasions. Users can personalize cards with messages, photos, GIFs, and videos. It supports sharing via a link and email, and offers various occasion categories. While it doesn't explicitly mention animated envelope reveals, it does state the recipient gets a 'delightful ecard'. It also offers background designs and the ability to add videos/voice notes, which aligns with music/audio and background themes. The site is responsive and offers social sharing. User accounts are implied for managing cards and packs, though not explicitly stated as a 'must-have' feature for saving individual cards without an account.