Tōku is a language learning app that allows you to practice your pronunciation and see how well you are understood by your device.
You can see a live transcription while talking and let it read out, so you can compare it to how you said it. You can easily copy the text to another app, for example to a flash card app to remind yourself to keep practicing.
For now Japanese, English and Dutch is supported. So you can start learning to speak any of these languages.
Happy learning!