Frequently asked questions.

WordHalo is a free Chrome browser extension for language learners. Highlight a word or short passage on a webpage and it shows a translation into your language, a learner-friendly definition, an in-context explanation, and pronunciation audio in a card beside the text.

The free plan is available now: unlimited English dictionary definitions, 15 AI reading helps per day, automatic language detection, pronunciation audio, an on-device word library, flashcards, and learning games. Companion ($5/month) and Fluent ($10/month) plans are a published preview and cannot be purchased yet — no payment is collected today.

No. The extension works without an account, and saved words, review progress, and game statistics are stored on your device. Optional accounts and cross-device sync are planned.

The interface and explanations are available in 12 languages. WordHalo automatically detects highlighted text in 25 languages, including English, Spanish, French, German, Portuguese, Japanese, Korean, Simplified Chinese, Thai, and Vietnamese. The supported-languages page lists both sets in full.

You choose one setting — “My language.” When you highlight text, WordHalo identifies its language among the 25 supported detection languages and explains it in yours. If the text is already in your language, the Definition tab opens first and the redundant Translation tab is hidden.

After you accept the first-use disclosure, WordHalo sends the text you highlight and up to 1,000 characters of nearby context to its service to generate the help. It does not collect your full URL or browsing history, and the extension requests only Chrome's storage permission. The privacy policy has full details.

Extension data lives in Chrome's local storage: remove the extension or clear its storage from Chrome's extension settings. For waitlist or analytics data, the support page documents the current process while a public request route is being finished.

The heart button saves a word with its translation, definition, context explanation, pronunciation, and example sentence, filed under its detected language. Flashcards show the word first and reveal the rest on request; “Practice again” schedules a word about a day later, while “I knew it” schedules it further out as your review count grows. Words progress through New, Learning, and Mastered.

Multiple-choice translation, definition matching, fill-in-the-blank using each word's own example sentence, a listening game where the browser supports speech, and a mixed daily review. Questions are built only from your saved words, distractors always come from the same language, and score, streak, and accuracy are tracked locally.

Not yet. The first release is a Manifest V3 extension for Google Chrome on desktop. Mobile apps are planned but not available.

Partly. Reviewing saved words, flashcards, and games work offline because they are stored on your device. Translations, AI definitions, and contextual explanations require a connection.

Selections are limited to 500 characters, and the free plan includes 15 AI reading helps per day. English dictionary definitions are unlimited and do not count against the daily allowance.

Yes. AI-generated translations, definitions, and explanations can be incomplete or incorrect, and WordHalo says so in its AI disclosure. Verify anything important — especially legal, medical, financial, or academic content — against an authoritative source.

Chrome blocks all extensions on browser-internal pages such as chrome:// pages and the Chrome Web Store, and some sites restrict extensions. WordHalo works on ordinary HTTPS pages with selectable text.