Dicty

The app allows you to learn new English words and phrases using a technique from cognitive science for fast and long-lasting memorisation - called ANKI. On a daily basis, you can enforce your basics and become a master in the conversation. You can switch between Ukrainian, French, Spanish, Italian, German, and Russian. All languages support translation between each other. English additionally supports search through the Definitions database.

Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/