Think C (stylized as THINK C), originally known as LightSpeed C, is an extension of the C programming language for the classic Mac OS developed by THINK Technologies, released first in mid-1986.
During the early-1990s, Think and Apple collaborated on a cross platform library known as Bedrock, but this effort was abandoned in 1993, by which time PowerPlant was the clear market leader.
Despite the decline in popularity of their IDE, Symantec was eventually chosen by Apple to provide next-generation C/C++ compilers for MPW in the form of Sc/Scpp for 68K alongside MrC/MrCpp for PowerPC.
[10] THINK C 5.0 obtained in 4 (out 5) rating in July 1992 issue of Macworld, praising a fast compilation and an outstanding development environment, despite an insufficient documentation.
[11] Symantec C++ 8.0 obtained a 3 (out 5) rating in July 1995 issue of Macworld, comparing favourably the speed of its PowerPC compiled code with that of CodeWarrior at the time, but noting how delayed the product has been and its heavy requirement on resources.