This is great, I’ve been wanting something like this for a while!
A few points of early feedback after 15min of listening with only “Show Translation” on:
1. Showing only a fragment of each sentence at a time feels hard to follow as in scanning to the start of the next fragment (which can jump around vertically) and lacking the context of previous words
Would you consider a view that shows more of the surrounding words but, like focus mode in iA Writer, grays out the non-current fragment?
2. There are sometimes gaps in transcription/translation
3. I couldn’t find my favourite Spanish podcast, Radio Ambulante, which I feel would probably be quite a popular one for Spanish learners — Any particular reason?
(For reference, it didn't show up with search term "radio ambulante" but did with "Radio Ambulante")