It's the first tablet that uses the webOS operating system, which HP bought along with Palm Inc. last year for $1.8 billion.
Hewlett-Packard Co. has previously made tablets based on Windows, but webOS is a cellphone operating system, making the TouchPad more like the iPad than a PC.
The price of the TouchPad also matches that of the iPad. The two versions come with 16 and 32 gigabytes of memory and connect to the Internet only with Wi-Fi.
HP says AT&T Inc. will sell TouchPads that work on its wireless network later this summer.