There may be no bigger time sink in the app store than Video Time Machine. The 10,000 videos in a variety of categories (from ads and news clips to music videos and movie trailers) kick-start a nostalgic feeling that prompts you to watch “just one more.” At its heart, it’s entirely dependent on YouTube uploaders, but developer Original Victories has handpicked some of the most representative of the eras. Just as fascinating are the historical videos, which show actual footage of the Titanic or the first sound ever recorded. It’s an app that’s easy to get lost in — and one where you absolutely won’t mind it when that happens.

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