Anki is a customizable flashcard program that uses spaced repetition to strengthen long-term character recognition and recall. Create cards with Chinese characters, pinyin, audio, images, and example sentences, or study with ready-made decks. Visit the Mandarin Mania Flashcards Hub for free Anki decks and step-by-step tutorials covering how to create and use your own cards.

AnkiPro offers a premium learning experience with several enhancements over the free Anki app. AnkiPro features a refined user interface, improved syncing across devices, better media handling, and advanced customization options for cards and layouts. It boasts over 50k+ pre-made decks. See the Chinese decks they offer HERE.Available Platforms: Android and iOS

Create flashcards as you read. 1000s of lessons with audio. Uses spaced repetition. Plus, you can Import and learn from anything from the web! Available Platforms: Andriod, iOS and Web

Free HSK 1 -4 Online Flashcards Available Platform: Web ​Only

This is a spaced repetition flashcard system, and I love it. Finding the right balance between learning new words and revising old ones is key to maximizing your learning speed. Once you have learned a new word it is automatically scheduled for revision/testing to make sure you don't forget it. Audio and examples are included. Choose from Simplified or Traditional characters, or Chinese Vocabulary.

Their flashcards collection contains thousands of sentences from beginner to expert. You can also choose cards based on parts of speech and topics for conversation. Simplified and Traditional characters are available. You can also choose a male or female voice. Available Platforms: Android, iOS and Web

Quizlet is a free website providing learning tools for students, including flashcards, study, and game modes. See the Chinese decks they offer HERE. Available Platforms: Android, iOS and Web

Yes, this is the online dictionary site you know and love. It also offers online flashcards for many Chinese textbooks. Available Platform: Web Only