One lesson a day, until the word sticks.

Vocabulary Grind System is an iOS app for learning the words of a foreign language. You pick the language you are learning and the language you already speak, you collect words, and the app drills them one short lesson at a time.

Adding words

You can type a word, photograph a page of text and pick out the words you want from it, or start from a generated set based on the languages and topics you chose during setup.

Every word gets a card: translations, example sentences, usage notes, synonyms, and audio pronunciation. The cards are generated by an AI model, so they can contain mistakes.

How lessons work

A lesson is twelve cards and unlocks once a day, at 12:00 in your time zone. The exercises mix recognition and recall: pick the translation, fill in a blank, write your own sentence, and timed variants of the same for words you already know well.

Each word carries a score from 0 to 8. A correct answer adds a point, a wrong answer or a skip takes one away, and a word counts as learned at 8. The app decides what to show you next from that score, so weak words come back more often than strong ones. A word you never practise loses a point every seven days.

Accounts

You can sign in with Apple, with Google, or with a one-time code sent to your email. You can also skip signing in and continue as a guest — a guest still gets a temporary account on our server, with a smaller allowance for AI-generated content, and it can be merged into a real account later.

An account is used on one device at a time. Signing in on a second device ends the session on the first.

The rest

A daily reminder notification, a home screen widget with your streak, an export/import file for your own backups, and an interface available in English, Russian, Ukrainian, French, German, and Japanese.

Your data

Your words and your learning progress are stored on our server so they can be restored on another device. You can delete your account and everything attached to it from inside the app at any time.

See the Privacy Policy for details.

Contact

Questions, bug reports, or account requests: dimaostapchenko@gmail.com