Der UNIVAC I (UNIVersal Automatic Computer I) war der erste in den USA hergestellte kommerzielle Computer. Er wurde von John Presper Eckert und John William Mauchly von der Eckert-Mauchly Computer Corporation entwickelt und von der Computerfirma Remington Rand 1951 gebaut.

G. Hopper's first compiler, A-O, was unveiled in 1949, and used symbolic mathematical code to represent binary code combinations. This she followed up with B-O, or "Flow-Matic," considered the first English language data-processing compiler. This was used to program UNIVAC I and II machines by the end of 1956. The UNIVAC, which stands for Universal Automatic Computer, was among the first commercially available computers in the Unites States, built by Sperry Rand.

When discussions arose as to how to create a standardized, universal computer language, Hopper was deeply involved in the development of COBOL; her Flow-Matic compiler was used to help form a basis for the language, and she designed standard manuals and tools for it as well as translator programs that converted non-standard COBOL languages into the standard version. The first specifications for COBOL were made available in 1959.