Add the people you care about - family, friends, your partner - and To Us (for iOS) automatically discovers thousands of milestones across their lifetimes. Round birthdays are just the start. Find the exact day someone becomes twice as old as their sibling, when a family's combined age hits 10,000 days, or when you've been with your partner longer than you lived without them. Every milestone has a rarity tier, from Common to Legendary. One-time purchase. No subscription.