A leverless controller is supposed to eliminate sluggish joystick movements. Sometimes, it has only buttons or a mixture of buttons and keys.
The GRAPHT iO is endorsed by Tachikawa, used by Kobayan, and comes in lever or leverless format—as well as DIY or preassembled format.
We can rave on and on about the benefits of the MS1, but its selling point is its unique right thumb button placement.
It's mind boggling how a small controller like the open source SplitFox Pro packs a split layout with 18 buttons into its little frame!
The Starburst is a mini leverless controller with 15 buttons, and you can tilt it to more than one angle for the comfort of your wrists.
If you don't need 16 or more buttons: the VSLAB VSNOVA N14 is a fine option with chamfered acrylic, customizable art, and cool LED.
The Split is divided into two halves connected through a coiled detachable cable—and should be compatible with future modules by Ultra Arcade.
The TIKITAKA M3 doesn't have 16 buttons. It has 17, and the 17th button is a rare fully sized start button on the top panel's upper left.
The SticklessBox features a rare combination of Sanwa buttons and the GP2040-CE firmware—plus a convenient carrying handle.