There are a lot of apps that having singing lessons. Yousician may be the most popular. I'd equate being able to speak a foreign language to singing in key. Th

There are a lot of apps that having singing lessons. Yousician may be the most popular. I'd equate being able to speak a foreign language to singing in key. That's what the apps will be able to help with, at least from what I've seen. If that's what you're looking for, that's a good place to start. However, there is a lot of technique to make your voice sound pleasant and interesting beyond just singing on key. I'm not sure if that apps really help out there that much like an actual vocal coach could.