Before the proliferation of pronunciation apps, Oxford University Press put out some fun and very useful pronunciation games on the web.
Games for pronouncing vowels, consonants and syllable stress
The games have British English audio….. but the consonant games (with voiced and voiceless sounds) and most of the syllable stress practice are the same as in American English.
Try these games on you computer or smartphone
I just tried the games and they are quite fun! And they’re free.
To read more tips for clear American English pronunciation, choose a link below. There’s a lot you can learn about spoken American English here on my ConfidentVoice blog.