The company credited with creating the first commercially successful personal computer in 1977 is Apple Inc.. Their product, the Apple II, was groundbreaking in its design and capabilities, featuring a plastic casing, a built-in keyboard, and color graphics. The Apple II set the foundation for the personal computing revolution and paved the way for future innovations in the industry. Its success helped establish Apple as a key player in the technology market, contributing significantly to the growth of home computing during that era.