Sure, the free version extracted my video’s audio as an mp3, but to choose other audio formats I had to pay the 5 bucks for upgrading. Did that, tried to export as wav files, as aac, etc. The results will only play within MP3Converter’s player. NOTHING else recognizes these files or is able to play them. I just wasted 5 bucks.
For more fun, try clicking on “App Support” for MP3Converter in MP3Converter Store (since there’s no link or access at all within MP3Converter itself). Behold a completely inaccessible foreign language page (as an English speaker). No way to get support, or to get my $ back, that I can figure out.
Oh, BTW, the 2nd image shown in MP3Converter store, showing an Audio Trim function? Not there. You just get play, pause buttons, etc., to listen to the result within MP3Converter . No such thing as Trim.
Stick with the free version, if you’re happy to extract audio as MP3. Just dismiss the ads, which are always there.