Dropbox demo Video（中英字幕）

The original five-minute Dropbox demo video, which presented the product's features before a finished product existed. It was aimed at technical early adopters and became famous as a launch strategy.

Why HN likes it: HN cites it as the classic example of validating a product idea with a demo video, and many recall how compelling it was.

“I still remember seeing the original 5 minute demo (1). My jaw was on the floor, I instantly needed it.”