Voice input and language
Voice input lets designers talk to Vizcom's prompt surfaces instead of typing, and the language work makes prompts behave well in the many languages Vizcom's designers actually speak.
Speaking a change is faster than typing one mid-sketch, and it keeps hands free for drawing. Under the hood this meant streaming transcription wired into every prompt surface, plus handling for multilingual input so a prompt in Japanese or German works as well as one in English.
I shipped both as product features at Vizcom; the launch demo is below.