The science

Why RIFF works the way it does

Short answers to real design decisions: the daily five, the weekly streak, the coverage meter. Each one closes with the research that shaped it.

Habits & motivation

The x/5 goal in your Journal's daily ring: five new words is a full day.

The week dots on your Journal: five active days out of seven make a full week, rest days included.

The flash exercise in Practice: answer from memory first, then flip and rate yourself.

Due cards on your Journal, paced by the Pace you picked in onboarding.

The catalog: pick a show, open an episode, and every card teaches a word in the exact sense that episode uses it.

The coverage bar on every episode (Seen, Tried, Known) and the six-stage comprehension profile it feeds.

Word cards are split by sense: run the verb and run the noun each get their own card.

The Common, Special, Exclusive and Rare badges on every word deck.

Every card pairs one meaning with its own pictures, graded definitions, example sentences and audio.

Phrasal verbs, idioms and cultural references get decks of their own instead of hiding among words.