InterSub Review for German Learners (2026)

Direct answer: InterSub runs on more platforms than any dual-subtitle extension we’ve reviewed: 13+ named services, including Deutsche Welle’s DW Learn German, which no competitor supports. The 4.6-star average over 216 Chrome Web Store ratings is earned, too. Now the catch. The free plan meters you to 15 word lookups per month (or unlimited lookups with ads), and the developer has publicly confirmed the cap is intentional. German works in both directions; German-specific grammar help of any kind does not exist here. If you watch across many services and will pay from $6/month, InterSub is a strong pick. If you want German depth, or a free loop you can actually learn on, keep reading.

What InterSub is

InterSub (“Dual Subtitles & AI Translation”) is a Chrome extension from InterSub Inc, a New York-registered company, and its store numbers are healthy: 30,000 users, a 4.6 rating from 216 reviews, and a Featured badge on the Chrome Web Store (listing last updated July 1, 2026).

The pitch is simple. It lays a second, translated subtitle line over streaming video, generates AI captions when no native-language track exists, and lets you hover any word for an instant meaning with lemma details, collocations, frequency, and pronunciation. Words you save land in a personal Wordbook with AnkiDroid sync, a Telegram bot, and Excel export, and an “AI Language Buddy” chat fields your grammar and slang questions. One practical note the vendor volunteers on its own homepage: InterSub requires an internet connection to function.

The platform list is the pitch

Most rivals stop at YouTube and Netflix. InterSub keeps going. Its homepage lists YouTube, Netflix, Prime Video, HBO, Crunchyroll, TED, Coursera, Udemy, LinkedIn Learning, Domestika, Shahid, and Bilibili.tv, plus word lookup on almost any website.

For German learners, one entry stands out: DW Learn German. Deutsche Welle’s free, CEFR-graded German course platform is the only language-specific site on InterSub’s list, and credit where due: it’s exactly the kind of content a serious German learner already uses. If your German diet is DW courses plus Crunchyroll plus a Udemy course, nothing else in this category follows you across all three.

The Prime Video caveat

Breadth is a promise you have to keep renewing, and Prime Video keeps calling it in. Support there has broken repeatedly: a 2-star store review from Tuğçe (March 27, 2026) reads “still not working on Amazon Prime”, and the developer’s reply is refreshingly candid: “they changed their player layout again - and everything broke once more”. We respect the honesty. Still, if Prime is your main screen, budget for occasional outages while the extension catches up.

InterSub pricing, verified

All prices, user counts, and feature claims on this page were last verified against the vendors’ own pages and Chrome Web Store listings on July 12, 2026.

Two things InterSub doesn’t publish on the pages we could verify: what “from $6/mo” scales to on a yearly plan, and the exact prices of the three credit packs beyond “from $1.5”. The pay-as-you-go option itself is genuinely unusual in this category. If you only binge in bursts, a one-time lookup pack can beat a subscription.

The 15-lookup meter

Fifteen lookups a month sounds survivable until you meet your first German subordinate clause. For a learner watching daily, the whole allowance is spent inside the first video. Users have noticed: a 1-star store review from April 22, 2026 complains, “u need a subscription to see more than 15 translations a month??? yall greedyyyyy”, and the developer’s reply (Kirill Rozhkovskiy, April 24, 2026) confirms the cap is intentional, not a bug. To be fair, the ads escape hatch exists: accept ads and lookups become unlimited. But as a free learning tier without ads, 15 lookups a month is the tightest meter of any extension in this cluster.

How good is InterSub for German?

Ask InterSub whether it speaks German and it answers yes, 28 different ways. German support is real and bidirectional: the vendor’s official language-pairs sheet lists German as a learning language translatable into 28 target languages including English, the store description names “English to German” explicitly, and DW Learn German support is unique in this space. The hover lookup’s lemma details, collocations, and frequency data apply to German like any other of its 30+ languages, and AnkiDroid sync is a practical bonus if your German vocabulary lives in Anki.

What’s missing is anything German-specific. Nowhere on the store listing or intersub.cc did we find noun gender display, separable-verb handling, compound-noun breakdown, case/declension information, or German TTS. German is treated as one supported language among 30+, not a specialty. For what it’s worth, none of the 12 most recent store reviews we sampled (dated March 27 to June 21, 2026) mention German at all. There’s simply no public evidence either way about how well its generic dictionary handles German’s grammar quirks.

What InterSub does well

• Widest platform coverage in the category, including DW Learn German (unique for German learners)
• 4.6 stars across 216 reviews, among the best-rated extensions in this space
• Hover lookups with lemma, collocations, frequency, and pronunciation: richer than a bare translation
• Wordbook with AnkiDroid sync, Telegram bot, and Excel export
• Pay-as-you-go credit packs from $1.50, a rare middle option between free and subscription
• A developer who replies to store reviews, including the critical ones

Where it falls short for German learners

• Free tier meters lookups to 15/month unless you accept ads (confirmed intentional)
• No German grammar tooling: no gender, no separable verbs, no compound nouns, no conjugation tables
• Prime Video support has a documented history of breaking when Amazon changes its player
• Yearly pricing not published, so you only learn the real cost at checkout
• Requires an internet connection to function (vendor’s own statement)

Who InterSub is best for

Picture a learner whose week is a DW Learn German lesson, a Udemy class, and a Crunchyroll habit. That’s InterSub’s person: viewing spread across many platforms, especially course sites (Coursera, Udemy, LinkedIn Learning) and DW Learn German, and happy to pay from $6/month for unlimited lookups in a language-generic dictionary. It’s a breadth tool: one extension across your whole watching life, with a solid but not German-aware learning loop.

InterSub vs Trancy, DualSub, and AFL

Each neighbour beats InterSub somewhere and loses somewhere else. Against Trancy (300,000 users), InterSub wins on raw platform count and DW Learn German support, but Trancy’s free-forever plan is far more generous: unlimited word and sentence translation with a 100-word bookmark cap, versus InterSub’s 15 monthly lookups. Neither offers anything German-specific. DualSub (100,000 users) is cheaper to start but has a disqualifying limitation for German learners: by its own documentation it only translates English-source subtitles, so it can’t translate a German video into English at all. The AFL extension (Language Learning with Netflix & YouTube-AFL, 100,000 users, 3.9 stars) covers only Netflix and YouTube with German as one of 55 languages: less breadth and a weaker rating than InterSub.

The Snapwords take

We build Snapwords, so weigh this section accordingly. It was built by a learner who went from A1 to C1 German in one year and turned that exact workflow into an extension, and against InterSub the contrast is simple: our free plan is a daily habit rather than a monthly meter, and German is the whole subject, not one language of thirty.

The meter first. InterSub’s ad-free tier hands you 15 lookups a month. Snapwords resets every morning: 5 word lookups, 5 saves, and 3 sentence breakdowns per day, plus 2 hours a month of AI dual German–English subtitles on the YouTube and Netflix videos you already watch. That’s a real evening: watch an episode, click the five words that threw you, save them, break down the one line you couldn’t parse, then do it all again tomorrow. And when the AI hours run out, subtitles drop to a free standard engine and keep rolling; there is never a paywall in the middle of an episode.

Then the German depth, which is where the two products stop being comparable:

• Every noun in the subtitles is colored by gender from a deterministic ~335,000-form German dictionary, never AI guesswork: der words show blue, die words red, das words green, and plurals purple. After enough evenings of seeing Tisch in blue, it stops being a memorized fact and simply feels masculine. Compounds inherit the head noun’s gender (Weltspitze is red because Spitze is die Spitze), and names are never colored, so no invented “der Stefan”.
• Separable verbs are recognized even when split across the sentence: in “macht die Tür auf”, clicking “macht” resolves to aufmachen, not machen.
• Clicking any subtitle word opens a card with gender, plural, spoken German pronunciation, conjugations and declensions, and “In this context”: what the word means in this exact sentence. That matters because German words wear many hats (ziehen alone can be pull, move house, or a draft), and the card tells you which one you just met.
• Saving a word turns the subtitle line itself into the flashcard’s example sentence, so a review feels like remembering the scene instead of rereading an invented example. Built-in SM-2 spaced repetition schedules those reviews; there is no separate app to maintain.
• Any line can be taken apart grammatically: the breakdown labels which word is Nominativ, which Akkusativ, which Dativ, and how the sentence hangs together.
• Saved words follow you off the video. They’re underlined on every webpage you browse afterwards, in both directions, and one save covers the whole word family: save a word in whatever form you met it, and both its singular and plural light up from then on, on the German side (one save of Haus covers Häuser too) and on the English side alike. Reading English, the words whose German you know light up; reading German, inflected forms match too, because the card stores every conjugation (a saved laufen also lights up as läuft or lief). They reappear highlighted in future subtitles, the dictionary works on any webpage (select a word anywhere, get the same card, save it), and everything syncs to a web dashboard with flashcards, a quiz, your word library, and CSV export.

Premium is €5 for 1 month or €12 for 3 months (€4/month) and raises the AI allowance to 100 hours of subtitles a month.

The honest trade-off: Snapwords covers YouTube and Netflix only (no Prime, no Crunchyroll, no DW Learn German), runs on desktop Chromium browsers only, has no mobile app, and supports only German↔English. If your watching lives on the platforms InterSub covers and Snapwords doesn’t, InterSub is the better fit. If German on YouTube and Netflix is your use case, we treat the language with a depth InterSub doesn’t attempt.

InterSub FAQ

Is InterSub free?

Partly. Dual subtitles without AI translation are unlimited on the free plan, but word lookups are capped at 15 per month unless you accept ads. A 14-day Premium trial is included; after that it’s credit packs from $1.50 or Premium from $6/month.

What platforms does InterSub support?

YouTube, Netflix, Prime Video, HBO, Crunchyroll, TED, Coursera, Udemy, LinkedIn Learning, Domestika, Shahid, Bilibili.tv, and DW Learn German, plus word lookup on almost any website.

Does InterSub work for German?

Yes. German is fully supported in both directions (German → 28 target languages per the vendor’s official pairs sheet), and DW Learn German is a supported platform. There are no German-specific grammar features, though: no gender, no separable-verb awareness, no declension info.

What happens after the 14-day trial?

You revert to the free plan: 15 lookups/month or unlimited with ads, plus non-AI dual subtitles. Your Wordbook words remain; unlimited lookups require a credit pack or Premium.

Does InterSub have a mobile app?

The subtitle extension runs in a desktop browser. InterSub’s plans reference mobile app and Telegram bot access for the Wordbook (limited on free and pay-as-you-go, full on Premium), so review on your phone is possible even though watching with dual subtitles is not.