Apple is close to hitting 50 billion apps downloaded. To celebrate, it revealed the most popular apps of all time.
We've rounded up the most popular free apps in this slideshow. Since free apps are significantly more popular than paid apps, and since Apple's App Store has more downloads than any other app store, these are probably the most popular mobile apps of all time.
25. Google Maps
This app just came out last year and it's already one of the most popular. This tells you what people really think about Apple maps. They're looking for a replacement.
24. Groupon
Groupon's daily deals app was downloaded by millions of people looking for good prices in their neighborhood. Groupon's stock has been crushed, and its CEO was ousted, but at least it has a strong base of mobile users.
23. Pac-Man lite
People love getting retro games for free on the iPhone.
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