Uplang — Japanese On Netf

Turn every Netflix show into a Japanese lesson.

uplang overlays interactive subtitles on Netflix. Every word is tokenized,
annotated with furigana, color-coded by how well you know it, and one click
away from an AI-generated grammar explanation or an Anki flashcard.

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WHAT YOU GET

• Dual subtitles, free forever. Japanese plus any secondary subtitle
language Netflix lists for the title (English, Spanish, Korean, Italian,
German, and more). No account required for the dual-subtitle mode.

• Correct word boundaries. Powered by Sudachi — Japan's gold-standard
morphological analyzer. Multi-word expressions like 食べたくなかった and
関係ない are identified as single units, not split into nonsense pieces.

• Tokenization for the whole episode in ~50 ms. By the time the first
subtitle appears, every word card in the entire episode is already
prepared. There is zero per-line delay.

• Furigana, your way. Always on, on hover, only on words you don't know
yet, or off. Font size and overlay offset are fully adjustable.

• Familiarity highlighting. Known words in green, fragile words in amber,
new words in your accent color — calibrated to your personal Anki
vocabulary.

• Word cards with dictionary data. Reading, part of speech, conjugation,
alternative forms, glosses — from JMdict (the definitive open-source
Japanese–English dictionary).

• Selection breakdown. Highlight any span of Japanese text for a
token-by-token breakdown with meanings and readings.

• AI grammar explanations. Request a contextual explanation for a word or
phrase; the AI sees the full subtitle line as context and explains the
grammar in plain language. No generic translations.

• One-click Anki flashcards. Send the word, reading, POS, glosses, and
full sentence context (Japanese + your secondary subtitle line) straight
into your Anki deck via the AnkiConnect add-on. Offline? The card is
queued and sent when Anki is running again.

• Vocabulary sync. Your Anki decks flow back into the extension to power
familiarity highlighting — so the words you are actively studying are
the ones highlighted on screen.

• Playback controls built for study. Optional pause-on-hover freezes the
video while you read a subtitle. Left / right arrow keys jump to the
previous or next subtitle line instead of Netflix's default 10-second
skip.

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HOW IT WORKS

1. Install the extension and open Netflix.
2. Dual subtitles appear automatically — pick any secondary language
Netflix offers for the title.
3. Sign in (or start a 7-day free trial) to unlock the interactive tools:
word cards, furigana, AI explanations, Anki integration, highlighting.

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PRICING

• Dual subtitles: free forever, no account needed.
• Pro (all interactive features): 6.99 USD per month, or 69 USD per year
(~5.75 USD per month). Every paid plan starts with a 7-day free trial.
Cancel in one click, keep Pro until the end of the billing period.

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REQUIREMENTS

• A Netflix account (any plan).
• For flashcard integration: Anki Desktop running locally with the
AnkiConnect add-on (free, add-on code 2055492159). Optional.
• For Pro: a uplang account (create one at uplang.io).

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PRIVACY

We take privacy seriously. The extension only reads subtitle text from
Netflix pages — never video, audio, or browsing history. Payments are
handled entirely by Stripe; card details never touch our servers. Full
details at https://uplang.io/privacy.

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ABOUT

uplang is built by PLATZDORSCH Softwareentwicklung GmbH & Co. KG in
Germany. Dictionary data comes from the JMdict project (CC BY-SA 4.0) and
tokenization is powered by Sudachi (Apache-2.0). Not affiliated with or
endorsed by Netflix, Anki, or Ankitects Pty Ltd.