A comparison of '''modular synth form factorsformats''' (or '''formatsform factors''') except [[Comparison of 3U modulesmodule formats|3U]], [[Comparison of 4U module formats|4U]] and [[Comparison of 5U modulesmodule formats|5U]], from all known modular synthesizer manufacturers. The form factor is a specification of dimensions, layouts, and other details that helps ensure compatibility between hardware of the same form factor.