The best replacement for keyboard is piano.

The best alternatives to keyboard are rated as following:
★★★★★  piano
★★★  mouse
★★★  digital piano
★★★  synthesizer
★★  controller
★★  guitar
★  keypad
★  synth
★  midi
★  midi controller
★  gamepad
★  kindle touch
★  pc keyboard
★  touch screen
★  drums
  controller fps
  guitar easier to learn
  mpc
  keyboard
  organ
  electric piano
  touch
  guitar amp
  game board
  workstation
  monitor
  regular keyboard
  73
  yamaha keyboards
  logitech keyboard for ipad
  samsung keyboard
  kindle paperwhite
  wireless keyboard
  guitar easier
  electronic piano
  piano which is better
  ergonomic mouse
  casio keyboard
  synthesizer difference
  qwerty
  qwerty keyboard
  backlit keyboard
  physical keyboard
  mechanical keyboard
  yamaha
  yamaha keyboard
  dvorak keyboard
  kindle 4
  pianos
  typewriter

Your alternative for keyboard is not listed? Suggest!
Speaking about keyboard, one probably shouldn't forget about mouse.

Other search terms related to keyboard and their ratings are:
★★★★★ mouse
★★★★★ touchpad
★★★★★ trackball
★★★ windows key
★★ caps lock
★ trackpad
★ notes
★ num lock
★ fn key
★ f keys
★ numpad
★ print screen button
★ integrated mouse
★ screen
backlight
midi
function keys
ipad
You have in mind a companion for keyboard and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of keyboard in all years. Click on graph for more.
keyboard
piano
mouse