Flexi: Vocabulary Builder

Flexi: Vocabulary Builder is a vocabulary training app that combines AI-generated flashcards with spaced repetition so new words actually stick. It’s designed for quick daily practice and makes it easy to capture new vocabulary and review it on a schedule.

AI flashcards and customization

Flexi uses AI to generate key card content at no extra cost, and lets you tailor cards to your learning style.

• AI-generated translation, usage example, and definition
• Custom fields to match your study goals
• Add your own notes and turn them into full flashcards later
• Image generation for words (available for premium subscribers)

Spaced repetition, streaks, and pronunciation

The app uses an advanced spaced repetition system that increases review intervals over time to support long-term memory.

• Spaced repetition scheduling for efficient reviews
• Daily streak tracking to stay consistent and monitor progress
• Built-in Text-to-Speech to hear correct pronunciation of words and phrases

Languages and iOS focus

Flexi supports English, Spanish, German, French, Russian, Arabic, Hebrew, Swedish, and Thai, with tight iOS integration for capturing words on the go and reviewing them later.