The best alternatives to Brydge Keyboard for Pixel Slate are Handy Keyboard, Keyboard+, and Touchtype Pro. If these 3 options don't work for you, we've listed a few more alternatives below.
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Touchtype Pro is a versatile iPad case that lets you magnetically attach an Apple Magic Keyboard. Magnetic tracks offers multi-angle desk or lap typing. Built-in stand even allows for portrait mode.