This is wonderful and addictive. One thing that comes to mind is that the UI allows for very little metadata - for example in some cases the audio has a slight mispronunciation even though the intended word was clear - wouldn't it be helpful to mark "difficult" cases like this? In other cases the volume is just super low or there is background noise.
The other thing is that it's very cool to see the "you helped us reach out x% goal" thing but it locks up all the previous / next shortcuts which means I have to switch back to the mouse after 5 entries.
The other thing is that it's very cool to see the "you helped us reach out x% goal" thing but it locks up all the previous / next shortcuts which means I have to switch back to the mouse after 5 entries.