WordAI vs OpenKoto

Look up any English word, slang term or idiom and get a clear explanation from AI, in English, Simplified Chinese or Traditional Chinese. Then ask follow-up questions until it clicks. WordAI is a free AI dictionary and vocabulary builder. No ads. No subscriptions. No in-app purchases. AN AI DICTIONARY THAT EXPLAINS • Meanings in plain language, with example sentences, word forms, synonyms, collocations and etymology • Slang, internet expressions, phrases and idioms, not just single words • Misspelled a word? WordAI shows the one you meant • Type in Chinese to find the English word ASK AI ABOUT ANY WORD • How is it used? What's the difference between "affect" and "effect"? Ask right on the word page. 35 EXAM WORD BOOKS • SAT, PSAT, ACT, AP, IB, SSAT, ISEE, GED, LSAT, MCAT, GRE and GMAT • TOEFL, IELTS, TOEIC, PTE and OET • Cambridge KET, PET, FCE, CAE, CPE and BEC • China's CET-4, CET-6, Gaokao and Kaoyan, and Taiwan's GSAT and GEPT REVIEW WITH FLASHCARDS • Ten-word rounds with instant feedback and pronunciation • Words you master in every meaning move to your Learned list YOUR OWN WORD LISTS • Import words from a PDF, Excel, CSV, Markdown or text file, or paste a list • Save words to your own word books and keep them in sync on iPhone and iPad WORKS OFFLINE • Download a 10,000- or 20,000-word dictionary, with audio for the 20,000-word pack, and look words up without a connection CONNECT YOUR AI ASSISTANT • Look up words and update your word books from AI assistants that support the WordAI connector FREE AND OPEN WordAI is free to use, with no ads or paid plans, and its vocabulary-learning core is open source. AI explanations can contain mistakes; check anything important. Exam names such as SAT, ACT, GRE, GMAT, TOEFL, TOEIC and IELTS are trademarks of their respective owners. WordAI is not affiliated with or endorsed by them.

OpenKoto is an open-source, privacy-first language-learning app. Turn the articles, books, and videos you genuinely care about into study material, understand sentences in context, collect vocabulary, and review it on a schedule. Key features: • Paste text or import TXT, Markdown, and web content • Import TXT and EPUB books with automatic chapter splitting, in either a sentence-by-sentence view or the book's original layout • Import video and audio with SRT / VTT subtitles — or generate subtitles on device when you have none (requires iOS 26) • Subtitles follow playback sentence by sentence; tap a line to jump to it, loop a single sentence, change speed without changing pitch, and hide the text to shadow by ear • Read sentence by sentence, resume where you left off, and add bookmarks and highlights • Show word-level readings above Japanese and Chinese text (furigana / pinyin), generated entirely on device • Search the full text of everything you have imported — articles, book chapters, and media transcripts — and jump straight to the sentence • Save vocabulary, organize word packs, and use spaced-repetition review; jump from any card back to the sentence it came from • View reading and review statistics • Use the app in English, Simplified Chinese, or Japanese • Choose light, dark, and multiple visual themes • Send web pages or selected text to OpenKoto from the iOS share sheet Optional AI features use a bring-your-own-key model. Configure a compatible provider of your choice for translations and sentence explanations. API keys are stored in the iOS Keychain, while learning content and progress stay on your device. AI requests go directly from your device to your selected provider and do not pass through an OpenKoto app server. No account is required. Sample articles are included, so reading, vocabulary, and review features work without configuring an AI provider. OpenKoto is free and open source.