Leitner Box is a simple flashcard app that helps you memorize words and phrases.
Read more about Leitner here
By logging in you will be able to add your words and use the following flashcards:

• کلمه‌های ضروری انگلیسی 504English to Persian
• کلمه‌های ضروری آلمانی German to Persian
• Palavras essenciais em inglêsEnglish to Portuguese
• كلمات اساسية باللغة الانجليزيةEnglish to Arabic
• Memorize CapitalsIn English

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Here is how your leitner box will looks like:
Sign in with Google to start learning!
You can use it to learn a new language or memorize any other type of information.
Using this app you could add/review words and pharases wherever you are.