Hewlett-Packard (NYSE: HPQ) has expanded its x2 hybrid PC lineup with a Windows 8 entry and another based on Google’s (NASDAQ: GOOG) Android operating system, both of which are slated to start selling in the United States in August.

The HP SlateBook x2 (Windows) and the HP Split x2 (Android) each feature magnetic hinges for removable screens that convert the units from notebooks to tablets. They bring to three the total number of hybrid notebook/tablets in HP’s arsenal to compete in a growing segment with key rivals Acer, Lenovo and Samsung.

Last August, HP rolled out the Windows 8-based Envy x2 to address the convertible segment. The vendor climbed back into the tablet business in February with the HP Slate 7, a 7-inch consumer-targeted unit running Android 4.1. Right now, it’s difficult to tell if the increased competition among hybrids is group think or an evolution away from the 10-inch tablet form factor to machines capable of more productivity than tablets. But, should the market move upward, HP wants to be ready, particularly with multiple operating system units, the vendor said.

“Customers want to access and share content anywhere, anytime, on any internet connected device—and they expect those connections to be seamless,” said Ron Coughlin, HP Consumer PCs senior vice president and general manager. “The HP SlateBook x2 and the HP Split x2 are next-generation devices and the latest examples of our continued commitment to evolving the computing experience by providing the flexibility necessary for customers to be productive at home, at the office or on the go.”

The SlateBook x2 features an Nvidia (NASDAQ: NVDA) Tegra 4 mobile processor, comes equipped with a 10.1-inch HD touchscreen display, 2GB of RAM and includes 64MB of storage. The unit weighs slightly more than 3 pounds and offers a battery in the display and another in the keyboard. It includes rear- and front-facing cameras.

HP’s Split x2 comes with a 13.3-inch screen, weighs a little more than 4 pounds and measures slightly less than an inch thick. It runs on either an Intel (NASDAQ: INTC) Core i3 or i5 processor, features 2GB of RAM, up to 128GB of SSD storage or up to 500GB of traditional hard drive storage housed in the keyboard. It comes with both a rear- and front-facing camera.

HP said the SlateBook x2 will be listed at $479.99 and the Split x2 priced at $799.99.