My feedback:
Text to speech seemed to work very well
Speech to text – my first try gave the error:
Error code: UNSUPPORTED_SAMPLE_RATE， please contact the support team or try other modes.
I was using mode 2
It worked on mode 1 (it would be nice to know what the different modes are??)
The text was hopeless, but I felt that maybe I needed to be closer to microphone when recording.
Second try of speech to text I got
Error: Audio file is too large!
The file was only 2meg
Third try – I used a much clearer recording but the result was still useless. Lots of wrong words and it seems to have no idea that a pause is the end of a sentence.
conclusion: will not work for me.
What dictionary is it using? What if you want to record medical notes for example. Can you teach it the medical terms (which I assume aren’t in your standard dictionary)?
I have not tried Google API and probably won’t as it requires a credit card (yes I know they won’t charge but they still require a credit card)
When opening a file from your PC, it doesn’t remember the last folder you used. (It would be useful if it did or let you set a default folder)
When you load a new mp3 it doesn’t clear the text off the screen from the previous file.
On this page on your website
easyspeech2text.com /Tutorial
you have
Advacned setting for speech to text
it should be
Advanced