Well done! It's not limited to pronounce a word. You can add some words or event a sentence.
My feedback: I think you need a box for inputting words that will be pronounced. It feels not easy that adding words after the URL every time to pronounce it (do I miss something?).
I usually use website like TheFreeDictionary by Farlex [1] to listen how a word is pronounced in both American-English and British-English.