If you're looking for an effective way to learn German or Russian words, you might want to try the "Немецко-русские карточки слов" app by ZXSoft. This free Android app helps you train your memory through a question-and-answer principle. It shows you a German word or phrase, then provides the corresponding Russian translation, or vice versa. With over 1,800 words, 172 German irregular verbs, and dialogues, this app offers you ample opportunities to improve your language skills.

One of the app's main features is the text-to-speech function. By enabling the Google TTS, you can listen to the pronunciation of the German words. Moreover, you can browse the flashcards in automatic mode, with or without sound. The app also allows you to translate words from Russian to German and vice versa. Additionally, it offers German and Russian riddles for children, and internet radio channels for improving your listening comprehension. However, to enable the radio to pause during incoming calls, the app requires permission to read phone state.