The voice recognition works pretty well. It struggles with very short sounds, but overall very good. I've used other programs that ask you to speak the answers, but the pronunciation analysis makes me try much harder to say each response out loud.
The romaji is good for beginners, but already know hiragana and katakana, so the romaji is very distracting. I wish there was an option to turn off romaji so I can practice reading.
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Response from Rocket Languages
The romanized version of the phrases can be toggled on/off under your profile.--