The Twiddler is a chorded keyboard and mouse allowing one to type with a single hand.

[1] The first Twiddler was launched in 1992 by the HandyKey Corporation.

[2] HandyKey was purchased in 2007 by the Canadian firm Tek Gear.

[5] The third generation Twiddler, the Twiddler 3, natively communicates using USB or Bluetooth and provides haptic feedback through an optionally installed module.

[6] The fourth generation, the Twiddler 4, announced in 2024, will use USB-C or Bluetooth, and replaces the Twiddler 3's joystick with an optical trackpad.