Lingo Flashcards

Spaced-repetition flashcard app with offline support and keyboard-first navigation.

Next.jsPWAIndexedDB

Overview

Lingo Flashcards is a spaced-repetition study app with full offline support. Decks sync when online and persist in IndexedDB, with keyboard-first navigation for fast review sessions.

Key features

SM-2 spaced-repetition scheduling with daily review queues
Offline-first decks backed by IndexedDB with background sync
Keyboard-first navigation and command palette
Installable PWA with push reminders

Tech stack

Next.jsTypeScriptIndexedDBPWA

My role

Solo developer — from product design to PWA packaging and deployment.

Challenges

Reliable offline conflict resolution. Solved with last-write-wins plus per-card revision history.