Symbolic ownership gifts come in three familiar shapes: naming a star, buying a souvenir plot of land, and — newest of the three — owning a calendar date. None of them hands you official, registered ownership, and a fair comparison should say so up front.
A date on OwnTheDay is $20 USD for past dates or $30 USD up to six months ahead — permanent, with up to 1,000 characters, 10 pictures and a soundtrack. Star naming typically runs £8–£70; souvenir plots typically £35–£120.