LinguaLayer - Learn Languages as You Browse

Learn Japanese (and more) by seeing words translated inline as you browse any website. Hover for definitions.

LinguaLayer - Learn Languages While You Browse Turn every webpage into a language lesson. LinguaLayer replaces common English words with their Japanese, Spanish, French, or Korean equivalents as you read naturally — and now lets you study at your CEFR level (A1 through C2). HOW IT WORKS - Words on every page you visit are subtly swapped to your target language - Substituted words appear in blue with a dotted underline - Hover over any word to see the original English, translation, and pronunciation - Adjust the intensity slider to control how many words get replaced - Pick the CEFR levels you're studying — beginner (A1) through proficient (C2) FEATURES - Four languages: Japanese, Spanish, French, and Korean — 9,000+ words each - CEFR-level filtering so you only see words at your difficulty - Adjustable word intensity from 5% to 20% (up to 50% with Pro) - Smart substitution that skips code blocks, input fields, and scripts - Hover tooltips showing English original, translation, and romaji/pronunciation - Works on every website automatically - Toggle on/off with one click from the popup WHY IT WORKS Research shows that contextual learning - encountering new words in familiar settings - dramatically improves vocabulary retention. Instead of dedicated study sessions, you absorb new words while reading articles, browsing social media, or checking email. Choosing your CEFR level keeps every substitution at a difficulty you can actually learn from. CEFR LEVELS - Free plan: A1, A2, and B1 — about 1,600 everyday words - Pro plan: B2, C1, and C2 — unlocks 8,000+ advanced and specialty words PRO UPGRADE - All six CEFR levels (A1 through C2) - Higher intensity settings (up to 50% word replacement) - One-time purchase, no subscription Privacy-first: all processing happens locally in your browser. No data leaves your device. No tracking, no analytics, no accounts.