Vocabulary-OS

Save a word with the sentence you found it in and see what it means right there, in your own language. Then review it with flashcards, quizzes and podcasts.

Learn words where you meet them. Capture a word from a sentence in any app, a page of a paper book or an object in front of you, and Vocabulary-OS explains what it means in that very sentence, in your native language. Then it helps you keep it, with spaced repetition, quizzes and podcasts made from your own words.

CAPTURE ANYWHERE • Paste text, or share a sentence from any app's share sheet. On a Mac, use the Services menu too. • Photograph a book page and tap a word: its sentence becomes the context, even across line breaks. • Photograph an object to learn its name, with its article where the language has one.

MEANING IN CONTEXT • The dictionary form, the part of speech and a short translation. • What the word means in this sentence, explained in your language. • Examples and the word's other common meanings.

REVIEW AND PRACTICE • Flashcards scheduled with spaced repetition. • Quizzes written from your words: meaning, reverse, fill-in-the-blank and listening questions. • Podcasts: a short dialogue or story at your level that uses the words you choose, read aloud by your device. • Study plans with reminders that open the activity, ready to start.

SEVERAL LANGUAGES AT ONCE Learn any of 19 languages, such as English, German, Spanish, French, Italian, Japanese, Korean or Chinese, with explanations in your own language. Learning English and German at the same time? Words go to the right language automatically.

YOUR CHOICE OF AI • Apple Intelligence on your device, with no account and no key, where Apple Intelligence is available and turned on. • Or connect a cloud provider with your own API key, such as OpenAI, Anthropic, Google Gemini, Mistral or DeepSeek, or your own server, such as Ollama.

PRIVATE BY DESIGN • No account, ads, analytics or tracking, and no server of ours. • Your words stay on your devices and sync through your private iCloud. • Before the first request to a cloud provider, the app shows what it sends.

FREE AND OPEN SOURCE Vocabulary-OS is free and open source under the MIT license, and supports Dynamic Type and VoiceOver on iPhone, iPad and Mac.