Greetings from Brazil!

In order to speak English with more confidence, I am trying to improve my English pronunciation skills and reduce my accent and small unnatural pauses in my speech as much as possible, and while I liked the Elsa Speak app, which checks your pronunciation and highlights parts of your speech that don't sound native, the free tier is a little limited, and there isn't enough control and customization for what I want. Basically, I want something that lets you input text, read it aloud, and have the program check your pronunciation, highlighting the parts that didn't sound native/natural, all while being free. It would be amazing if it were open source, assuming one such program exists. I would also strongly prefer Windows, but Android is also an option. I scoured the internet, but couldn't find a suitable app/program at all, so I hope one does exist and someone here knows.

Thank you!