Word of the Day - Learn one new word, every day
SmartCards+ - Spaced Repetition Software for iOS. Modern, powerful and easy to use.
Reji - Improve your vocabulary hassle-free 📚
Zorbi - Spaced-Repetition Flashcards - Other tools are built by boomers, Zorbi is built by students.
Synonymful - Improve your vocabulary and communicate like a pro.
Harken - Flashcard app using smart repetition to improve your memory