This app was mentioned in 3 comments, with an average of 1.00 upvote
Ta demande me fait penser à SingStar. Ça reste un jeu qui va te donner un score en fonction de la tonalité des sons sortis de ta bouche.
Tu n'as même pas besoin de connaitre les paroles. si tu as juste envie de faire "lalala" ça marche aussi. Et pendant que tu chantes, tu vois tout de suite si tu es dans le vrai ou le faux.
L'équivalent PC gratuit de SingStar est Ultrastar Deluxe. L'avantage, c'est que ça va avec n'importe quel musique (à condition que la communauté ait pu faire le fichier de son qui va avec)
Sinon sur Android, en faisant une recherche Google j'ai trouvé ca : https://play.google.com/store/apps/details?id=com.harmonynetwork.singsharp&hl=fr&gl=US
Not sure if it would be much help, but it might be a good idea for you to start taking up singing to yourself in your spare time, trying to belt out and hit some real hard notes, an app that teaches you to sing such as Vanido(Iphone) or Learn to Sing(Android) can give you better control over your vocal chords and teach you how to use what air capacity you have!
You can try using free pitch apps to check what pitch are you sounding out accurately. eg. I use sing sharp on my phone.
There are 2 reasons for using this app.
You are not hearing yourself singing the same octave due to lack of training. (many beginners including me think we are singing the same pitch yes, but we are on a different octave. So we could be singing E3 instead of E4.) The find your vocal range vids do not give you an accurate feedback on whether you are singing the exact same note on the same octave or not. It just gives you a template to how far or low you can go.
There are a few different classifications on which is middle C. Some say its C3 others say its C4. Anyway, based on the scientific hertz, C4 is middle C according to the app.
After you use this app to test your pitch and see if there's any difference. Note that I'm not saying you're lying. Just that it is easy to get lost in all the misconceptions floating on the internet. :)