You can get a lifetime subscription to Promova Premium on sale for $79.99 right now (reg. $299.99). Promova is a top 10-rated language-learning app in the App Store and top 20 on the Google Play store, and while its more designed for people learning English as a second language, you can practice nine other languages for far less than other platforms. (Languages include English, Spanish, Arabic, Chinese, French, German, Italian, Korean, Portuguese, and Ukrainian.) The app includes features like five-minute lessons, gamified quizzes, grammar exercises, speaking practice, and reading. Theres even a specialized mode for people with dyslexia.

You can get a lifetime subscription to Promova Premium on sale for $79.99 right now (reg. $299.99), though prices can change at any time.