The Cray APP (Attached Parallel Processor) was a parallel computer sold by Cray Research from 1992 onwards.
It was based on the Intel i860 microprocessor and could be configured with up to 84 processors.
The APP was marketed as a "matrix co-processor" system and required a SPARC-based host system to operate, such as the Cray S-MP.
Connection to the host system was via VMEbus or HiPPI.
A fully configured APP had a peak performance of 6.7 (single-precision) gigaflops.