TddStudy

nine20

About this app

TddStudy is a quiz and interactive reading app that helps developers build knowledge through short daily study and adaptive review. See what to study next on Home, then move naturally from results into wrong-answer review or the next lesson.

Key features
- A five-question daily goal, study streak, and recent activity summary
- Due review recommendations and focused wrong-answer retries
- Android, iOS, and backend courses organized by level
- Quiz packs and interactive books with chapter checkpoints and tests
- Immediate answer feedback with clear explanations
- Result actions that lead into review, wrong answers, or the next lesson
- Korean and English content with light and dark themes
- Offline study for downloaded quiz packs and installed books

Core study content ships with the app. Additional quiz packs and books are stored on your device after download, while saved study history powers your review recommendations.

What’s new

The learning flow and visual design have been rebuilt.

- Home now puts today's study, due review, wrong answers, and recent activity first.
- Results lead naturally into incorrect-answer review or the next lesson.
- Quiz pack discovery and book chapter checkpoints are easier to follow.
- A new black-and-white theme and app icon unify the experience.
- Loading and error states, larger text, and touch targets are more accessible.