By next year, Apple Inc. is planning to start selling Mac computers that contain main processors it has made itself, relying on designs that helped popularize the iPhone and iPad, according to people familiar with the matter.

The Cupertino, California-based technology giant is working on three of its own Mac processors, known as systems-on-a-chip, based on the A14 processor used in the next iPhone. The first of these will be much faster than the processors in the iPhone and iPad, the people said.

Apple is preparing to release at least one Mac that uses its own chip next year, according to the people. But the initiative to develop multiple chips, codenamed Kalamata, suggests the company intends to transition more of its Mac lineup away from current supplier Intel Corp.