2 Shazam
Shazam may be one of the oldest popular iPhone apps that we still use today. It first launched in 2009, just a few months after the App Store itself debuted. There were key differences. For one, Shazam wasn’t owned by Apple (which acquired it last year). And it was also a paid app — at launch, it cost $4.99.
What’s pretty remarkable is that Shazam really hasn’t changed all that much in the decade since it first went public. You tap on it to record an audio clipping and send it to their servers. From there, you get your results back. It just goes to show that if something isn’t broken, don’t fix it. (Though, of course, there have been changes to the way the app shows ads and displays its results.)