Relationship Since Calculator is a lifestyle app available on iPhone that calculates the duration of your relationship with your partner. The app generates unique anniversaries like "the 333rd day" or "the 50th month" to celebrate your time together. Users can choose from a variety of preset images or set their own from their Photos or Camera, adding a personal touch to their shared moments. Sharing options allow users to create and send beautiful images showcasing their relationship milestones.

Moreover, Relationship Since Calculator provides detailed metrics such as the number of months, weeks, days, seconds, and even heartbeats that have passed since you and your partner started your journey together. The app also offers settings to adjust the date in case of any changes in the relationship status.