Modular controllers for fighting games range in their specifications. However, a common element is that you can modify their usage style on the go.
You can use the Hori Arcade Classic Pro's ball-top joystick, rotary joystick, trackball, and spinner modules with your right or left hand.
The HauteBox One is a wireless split-layout controller with lever and leverless modules that are interchangeable.
The Modernbox is an ergonomic controller with a custom layout optimized for Street Fighter 6 modern controls, and it can come with a joystick.
The X-Move is a sequel to Haute42's modular controller that was nominated for an Evo award, and you can move some of its modules sideways.
The Kurtroller is like modular controllers meet LEGO—with many possible colors for its modules that allow you to swap layouts on the go.
With the Meisterbox L, Alpenmeister offers a unique way to play Street Fighter (and other fighting games), such as through a split layout.
The KeebWarrior-S3 is the most ergonomic controller yet, and that is because you can adjust its modules to fit perfectly on your lap.
The Split is divided into two halves connected through a coiled detachable cable—and should be compatible with future modules by Ultra Arcade.