Comparing Technologies - Density (gates per chip)
Highest to lowest density: Full Custom, Standard Cell, Gate Array, FPGAs, CPLD, PLD
Full Custom, Standard Cell, Gate Array are called ASIC technologies (Application Specific Integrated Circuit). Large Density gap between ASIC technologies and Programmable logic technologies (FPGAs, CPLD, PLD).
Highest end FPGA density is now equal to low-end ASIC density (i.e., hundreds of thousands of gates with embedded SRAMs).