I must say, I'm really skeptical of all these apps. I've tried pretty much all of them (well, not literally all of them, but a lot). I've had to move/travel quite a lot in my life, and I tried to get a "head start" on learning the language, with a different app. Every time, going to the country, I quickly realized that I could not speak the language. At best I could read it and produce with effort some sentences that…
English semi-famously remains comprehensible if you replace every vowel with a schwa. So sure you'll have an extremely weird accent, but this is acceptable according to the OP's definition of "speaking a language" from the first paragraph of the article.