# Ddict vs InterSub Ddict records 32,146 monthly visits with +2.4% month-over-month growth and Freemium pricing. InterSub records 71,644 monthly visits with -11.2% growth and Freemium, Free Trial pricing. | Metric | [Ddict](https://openaitools.app/tool/ddict) | [InterSub](https://openaitools.app/tool/intersub) | | :--- | :--- | :--- | | Website URL | https://ddict.me | https://intersub.cc | | Categories | AI Translate, AI Writing Assistants, AI Grammar Checker, AI Summarizer | AI Language Learning, AI Translate, AI Subtitle Generator | | Pricing Model | Freemium | Freemium, Free Trial | | Monthly Visits | 32,146 | 71,644 | | MoM Growth Rate | +2.4% | -11.2% | | Primary Market | Vietnam | United States | | Direct Visits | 20,961 | 31,959 | | Review Score | 4.2 | 4.2 | | Saved Count | 3 | 2 | | Supported Platforms | Website | Website | ## Ddict Ddict has been available since 2011, originally as a Firefox add-on before expanding to Chrome, Edge, Opera and other browsers. The core workflow is simple: highlight a word or sentence, open Ddict, and get an instant translation along with dictionary definitions, pronunciation audio, and text-to-speech. Chosen words can be saved and later reviewed. Beyond quick lookups, Ddict includes a flashcard system with spaced repetition so saved vocabulary turns into a structured study routine. The Ddict AI layer uses large language models to produce more context-aware translations, condense long articles into summaries, and help polish emails and other writing. A grammar and spelling checker flags typos and mistakes as you work. Ddict also offers document and reader features for formats such as PDF, docx and epub, aimed at translating and reading longer texts inside the browser. The project reports hundreds of thousands of monthly users across multiple browsers and positions itself around removing language barriers for reading, learning, and writing. **Pricing & Plans:** Freemium. The browser extension and core translation, dictionary, TTS and flashcard features are described as free forever. AI-powered translation, summarization, and writing assistance are part of the Ddict AI offering, with additional paid tiers implied by the freemium model. - **Instant on-page translation:** Select a word or sentence on any website and translate it in a click or with a keyboard shortcut, without leaving the page. - **Dictionary and text-to-speech:** Get dictionary definitions and hear pronunciation via text-to-speech for the selected term. - **Flashcard vocabulary learning:** Saved words sync automatically into flashcard decks with spaced repetition to build vocabulary. - **AI translation and summarization:** LLM-powered translation with better context, plus summaries that condense long content into key points. - **Grammar, spelling, and writing help:** Checks catch typos and grammar issues, and suggestions help refine emails and other writing. **Strengths:** Free forever core translation and dictionary with a long track record since 2011; Works directly inside websites across many popular browsers; Combines translation with vocabulary flashcards for active learning; AI summarization and grammar checking in the same tool **Limitations:** Best experience depends on installing a browser extension; Advanced AI features sit behind the Ddict AI offering; Some features are tied to supported document formats and browsers [Profile (Markdown)](https://openaitools.app/tool/ddict.md) ## InterSub InterSub takes the idea of immersion learning and puts it inside the shows you already watch. It is a browser extension for Chrome, Edge, and Firefox that layers two subtitle tracks over the video player: one in the language you are learning and one in your native language. Instead of switching between a video and a dictionary tab, the explanation appears exactly where the problem is. Hovering over any subtitle word pauses the video and opens a pop-up with an AI-generated definition and a context translation of the words around it. Every lookup is saved to a personal Wordbook together with the sentence it came from, so vocabulary review is built from real scenes rather than generic word lists. The extension also includes an AI Language Buddy tutor that can explain meaning, grammar, and cultural references, and AI subtitle translation for episodes that have no subtitles in your language. InterSub works across Netflix, YouTube, Prime Video, HBO Max, Crunchyroll, TED, Coursera, Udemy, LinkedIn Learning, Bilibili.tv, and several other platforms, with dozens of language pairs. It also handles study mechanics: a pause-only subtitle mode trains listening, shadowing mode stops after each line so you can repeat it aloud, and a Telegram bot runs spaced-repetition drills on your saved words with Anki sync as an alternative. Dual subtitles themselves are free, with lookups limited each month on the free plan. **Pricing & Plans:** Free to start with dual subtitles included. The free plan allows a limited number of word lookups each month; Pay-as-you-go and Premium plans add more lookups and unlock AI subtitle translation. Exact prices are listed on the site's plans page. - **Dual subtitles in your two languages:** Watch with the subtitle of the language you are learning and your native language stacked, one line above the other, directly inside the video player. - **Hover pop-up dictionary:** Hover any subtitle word and the video pauses while a pop-up shows an AI-generated definition plus a translation of the surrounding context. - **Self-filling vocabulary builder:** Every word you look up lands in your Wordbook with its original context, so you build a personal list from scenes you actually watched. - **AI subtitle translation:** If an episode has no subtitles in your language, InterSub translates them on the fly with AI and shows the translation as the second line. - **AI Language Buddy tutor:** Ask a ChatGPT-powered tutor what a word means in this scene, why the grammar works that way, or what a cultural reference is about. **Strengths:** Dual subtitles and hover lookups happen inside the player, so you never leave the episode; Vocabulary is captured automatically with the sentence it came from; Supports dozens of language pairs across streaming, learning, and anime platforms; Extra study tools like pause-only subtitles, shadowing mode, a Telegram bot, and Anki sync **Limitations:** Desktop browser extension only, with no full mobile app; Word lookups are capped each month on the free plan; Requires an internet connection for translations and subtitle synchronization [Profile (Markdown)](https://openaitools.app/tool/intersub.md) ## Frequently Asked Questions ### How do Ddict and InterSub compare in monthly traffic? Ddict has 32,146 monthly visits, while InterSub has 71,644. Traffic estimates describe audience size, not product quality. ### How do their growth rates compare? Ddict has a month-over-month growth rate of +2.4%; InterSub has -11.2%. ### How does pricing compare? Ddict: Freemium. Freemium. The browser extension and core translation, dictionary, TTS and flashcard features are described as free forever. AI-powered translation, summarization, and writing assistance are part of the Ddict AI offering, with additional paid tiers implied by the freemium model. InterSub: Freemium, Free Trial. Free to start with dual subtitles included. The free plan allows a limited number of word lookups each month; Pay-as-you-go and Premium plans add more lookups and unlock AI subtitle translation. Exact prices are listed on the site's plans page. ## Alternatives | # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | 1 | [Grammarly](https://openaitools.app/tool/grammarly) | 58,867,412 | -1.5% | Freemium | Cross-platform AI writing assistant delivering real-time grammar correction, tone alignment, authorship tracking, and team style guides. | [.md](https://openaitools.app/tool/grammarly.md) | | 2 | [LanguageTool](https://openaitools.app/tool/languagetool) | 5,707,795 | -4.2% | Freemium | AI grammar, spelling and style checker for 30+ languages | [.md](https://openaitools.app/tool/languagetool.md) | | 3 | [Monica](https://openaitools.app/tool/monica-ai) | 4,512,775 | -11.3% | Freemium | All-in-one AI assistant across web, browser, desktop and mobile | [.md](https://openaitools.app/tool/monica-ai.md) | | 4 | [Sider](https://openaitools.app/tool/sider) | 2,644,740 | -10.6% | Freemium | AI sidebar and browser agent for reading, writing and research | [.md](https://openaitools.app/tool/sider.md) | | 5 | [Immersive Translate](https://openaitools.app/tool/immersive-translate) | 2,392,414 | -9.4% | Freemium, Free Trial | Bilingual AI translation for websites, documents, video and images | [.md](https://openaitools.app/tool/immersive-translate.md) | | 6 | [Language Reactor](https://openaitools.app/tool/language-reactor) | 1,878,769 | +0.6% | Freemium | Learn languages from Netflix, YouTube, and real-world texts with dual subtitles and AI | [.md](https://openaitools.app/tool/language-reactor.md) | | 7 | [Merlin AI](https://openaitools.app/tool/merlin-ai) | 1,382,634 | +13.1% | Freemium | One-click AI assistant for browsing, writing and research | [.md](https://openaitools.app/tool/merlin-ai.md) | | 8 | [HARPA AI](https://openaitools.app/tool/harpa-ai) | 537,461 | +99.3% | Freemium | One browser agent that combines every major AI model with web automation | [.md](https://openaitools.app/tool/harpa-ai.md) | | 9 | [Trancy](https://openaitools.app/tool/trancy) | 438,752 | -57.6% | Freemium, Free Trial | An AI language learning assistant with bilingual subtitles, immersive translation, and vocabulary practice | [.md](https://openaitools.app/tool/trancy.md) | | 10 | [Linguix](https://openaitools.app/tool/linguix) | 227,398 | -4.5% | Freemium | AI grammar checker and writing assistant for teams and professionals | [.md](https://openaitools.app/tool/linguix.md) | --- Source: https://openaitools.app/compare/ddict-vs-intersub More Markdown: [Categories](https://openaitools.app/categories.md) · [Traffic rankings](https://openaitools.app/rankings.md) · [llms.txt](https://openaitools.app/llms.txt)