# InterSub vs LingoSub

InterSub records 71,644 monthly visits with -11.2% month-over-month growth and Freemium, Free Trial pricing. LingoSub records 4,137 monthly visits with +33.2% growth and Free Trial, Paid pricing.

| Metric | [InterSub](https://openaitools.app/tool/intersub) | [LingoSub](https://openaitools.app/tool/lingosub) |
| :--- | :--- | :--- |
| Website URL | https://intersub.cc | https://www.lingosub.com |
| Categories | AI Language Learning, AI Translate, AI Subtitle Generator | AI Language Learning, AI Video Translator, AI Translate |
| Pricing Model | Freemium, Free Trial | Free Trial, Paid |
| Monthly Visits | 71,644 | 4,137 |
| MoM Growth Rate | -11.2% | +33.2% |
| Primary Market | United States | United States |
| Direct Visits | 31,959 | 1,400 |
| Review Score | 4.2 | 4.1 |
| Saved Count | 2 | 4 |
| Supported Platforms | Website | Website |

## 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)

## LingoSub

LingoSub is a browser-based language-learning service built around comprehensible input. Rather than drilling isolated vocabulary lists, it uses genuine videos — vlogs, comedy, music, cartoons, news and lessons from native creators — and layers word-by-word subtitles, sentence translations and grammar notes on top of the official YouTube player. A three-minute vocabulary test estimates how many words you know and places you between A1 and C2, then the library surfaces videos matched to that level so you already understand most of what you hear.

During playback, each word is highlighted as it is spoken, with its meaning in that specific sentence shown above it, along with its dictionary form, part of speech, frequency and a note where the grammar or slang needs explaining. Idioms and separable verbs are treated as single units. Learners who want more support can show translations over every word; as they improve they can switch to only-unknown-word translations or turn them off entirely. Playback speed is pre-matched to both your level and the speaker's pace, and you can replay a sentence, auto-pause after each one, or slow things down.

Free access covers every video and story with subtitles and sentence translations plus the level test, with no account required. LingoSub Pro adds per-word translations, tappable word meanings and grammar, native pronunciation and a saved-word list. The library currently spans French, German, English, Italian, Russian, Latin, Romanian, Norwegian, Spanish, Korean, Japanese and Portuguese, with roughly 3,600 videos rated from A1 to C2.

**Pricing & Plans:** Free tier includes all videos and stories with subtitles and sentence translations, plus the level test with no sign-up. LingoSub Pro is listed at $12 per month or $99 per year and unlocks per-word translations, word meanings and grammar notes, native pronunciation and saved words.

- **Word-by-word timed subtitles:** Every word is transcribed with its own timing so it highlights exactly as it is spoken, with the meaning in that sentence displayed above it.
- **3-minute vocabulary level test:** A no-signup test estimates how many words you know and places you from A1 to C2, then recommends videos matched to that level.
- **Context-aware word and grammar notes:** Tap any word for its dictionary form, part of speech, frequency, in-sentence meaning and a note explaining the grammar, slang or expression.
- **Adaptive translation display:** Show translations over every word as a beginner, switch to only unknown words as you improve, or turn them off completely.
- **Level-matched native video library:** Thousands of real YouTube videos across 12 languages rated from A1 to C2, playable in the official YouTube player.

**Strengths:** Learns from authentic native content instead of scripted textbook dialogues; Word-level timing and in-context explanations go far beyond plain YouTube subtitles; Free tier covers all videos, stories and the level test with no account; Supports twelve languages with CEFR-rated libraries and per-language level tests

**Limitations:** Codeswitching-heavy videos may still overwhelm absolute beginners despite translation support; Videos are hosted by YouTube, so playback depends on that platform being available; Advanced word meaning, grammar notes and saved words are locked behind the Pro subscription

[Profile (Markdown)](https://openaitools.app/tool/lingosub.md)

## Frequently Asked Questions

### How do InterSub and LingoSub compare in monthly traffic?

InterSub has 71,644 monthly visits, while LingoSub has 4,137. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

InterSub has a month-over-month growth rate of -11.2%; LingoSub has +33.2%.

### How does pricing compare?

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. LingoSub: Free Trial, Paid. Free tier includes all videos and stories with subtitles and sentence translations, plus the level test with no sign-up. LingoSub Pro is listed at $12 per month or $99 per year and unlocks per-word translations, word meanings and grammar notes, native pronunciation and saved words.

## Alternatives

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [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) |
| 2 | [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) |
| 3 | [SubEasy](https://openaitools.app/tool/subeasy) | 476,185 | -35.4% | Freemium, Paid | AI transcription, subtitles and video translation in one browser studio | [.md](https://openaitools.app/tool/subeasy.md) |
| 4 | [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) |
| 5 | [Checksub](https://openaitools.app/tool/checksub-com) | 103,481 | -25.6% | Free Trial, Paid | AI subtitles, dubbing and 200-language video translation in one browser editor | [.md](https://openaitools.app/tool/checksub-com.md) |
| 6 | [Parrot App](https://openaitools.app/tool/parrot-app) | 90,721 | +49.6% | Free Trial | Learn Spanish fast by scrolling short videos from native speakers | [.md](https://openaitools.app/tool/parrot-app.md) |
| 7 | [AutoDub](https://openaitools.app/tool/autodub) | 65,653 | +21% | Free | AI dubbing and bilingual subtitles for any YouTube video | [.md](https://openaitools.app/tool/autodub.md) |
| 8 | [AI Video Translator](https://openaitools.app/tool/ai-video-translator) | 63,930 | -10.5% | Free | Translate videos into 30+ languages with editable subtitles and AI voices | [.md](https://openaitools.app/tool/ai-video-translator.md) |
| 9 | [AI Subtitle Translator](https://openaitools.app/tool/ai-subtitle-translator) | 52,413 | -26.5% | Freemium, Paid | Translate subtitle files into 50+ languages in minutes | [.md](https://openaitools.app/tool/ai-subtitle-translator.md) |
| 10 | [Ddict](https://openaitools.app/tool/ddict) | 32,146 | +2.4% | Freemium | Browser translation, dictionary, and AI writing assistant | [.md](https://openaitools.app/tool/ddict.md) |

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Source: https://openaitools.app/compare/intersub-vs-lingosub

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