Learn vocabulary,
smarter.

Simple Vocab is an AI-powered multilingual vocabulary app. It supports 5 languages — English, Japanese, Thai, Chinese, and Korean — with 20 language pair combinations. Simply enter a word and AI automatically generates translations, example sentences, synonyms, and antonyms.

Yes, core features are completely free. Word registration, search, study mode, and text-to-speech are all included in the free plan. Premium features like tag management, CSV import/export, favorites, and ad-free experience are available with a paid subscription.

You can learn with any combination of Japanese, English, Thai, Chinese (Simplified), and Korean. For example, English→Japanese, Thai→English, Korean→Chinese, etc. All 20 possible language pairs are supported.

When you enter a word, our AI powered by OpenAI automatically generates translations, including multiple meanings when applicable. It also generates synonyms, antonyms, and example sentences using the word in context.

Yes, Simple Vocab is a PWA (Progressive Web App), so you can add it to your home screen and use it like a native app. It works on both Android and iOS devices.

Premium is available as a monthly subscription ($2.99/month) or a one-time lifetime purchase ($39.99). We support 5 currencies: JPY, USD, THB, CNY, and KRW. The lifetime plan gives you permanent access to all premium features.

Yes, with the Premium plan's CSV export feature, you can download all your vocabulary data as a CSV file. You can also use CSV import to bulk-register words.

Simple Vocab is operated by INFIBILITIS CO., LTD. (TAX ID: 0105565120062), based in Bangkok, Thailand. The representative is Taro Nishimura. Contact: [email protected]