Clevystar — Vocabulary Helper by Nazarii Studio

Learn words without leaving the page.

Clevystar is a local-first vocabulary helper for Firefox. Select an English word on a webpage to instantly see its definition, pronunciation, example, collocations, synonyms, antonyms, and related words.

Save useful words to your personal vocabulary collection and review them later from the Clevystar popup.

Features

Instant word lookup from selected text
Definitions, examples and pronunciation
Common collocations
Synonyms, antonyms and related words
Multiple parts of speech
Local vocabulary storage
Offline fallback for previously viewed words
JSON backup and restore
CSV, Anki TSV and Quizlet TSV export
No accounts, analytics, advertising or telemetry

Local-first

Your saved vocabulary stays in your browser. When you explicitly request a lookup, the selected word is sent to the dictionary services required to retrieve its information.

Clevystar is free and open-source software.