Everything you need for Japanese. Genuinely in one app.

Furigana and pitch accent on every word, your own Yomitan dictionaries, Anki export with the source audio — and local transcription that even handles anime with no subtitles.

Download for Mac

Free to try — 20 videos & 5 books. No card, no account.

Mac & Windows Free to try, pay once Works offline

Anki — card preview JPVOCABWORD

Two note types, both built in. Word-first or sentence-first — furigana, pitch accent, and the JMdict gloss come with it.

Furigana
Pitch accent
UniDic tokenization
Yomitan import
Local Whisper
Anki export
i+1 mining

// THE WHOLE WORKFLOW

The immersion setup you'd otherwise build by hand.

Sentence mining usually means stitching together a browser dictionary, a video player, Anki, a pitch-accent add-on, and frequency lists — tools that don't quite talk to each other. Octopus is all of it in one native app.

Five tools, stitched together

Yomitan dictionary pop-up asbplayer subtitle mining JMdict JP→EN dictionary Pitch-accent add-on accent data KANJIDIC2 kanji data

Octopus

One native app — the whole workflow in one place.

Reader
Dictionary
Transcriber
Pitch graphs
Anki export

Bring your own dictionaries and frequency lists — Octopus reads the same Yomitan-format files you already load into Yomitan.

// THE i+1 METHOD

It finds the sentences with one new word.

i+1 — a sentence where you know everything but one word — is the sweet spot for sentence mining. Octopus reads your vocabulary, scans the transcript, and surfaces the i+1 and i+2 lines with a one-tap Mine button. For Japanese video lessons.

Transcript — slice_of_life_e07.mkv

また明日あした、学校がっこうでね。
✓ known
この景色けしきは本当ほんとうに綺麗きれいだ。
契約けいやくの条項じょうこうを慎重しんちょうに検討けんとうする。
4 new · skip
停電ていでんで計画けいかくが台無だいなしだ。

Octopus reads your vocabulary, flags the lines with one or two new words, and one tap mines the word with its sentence — straight into your Anki deck. Toggle it on for any Japanese video.

// SEE IT WORK

Hover a word. There's the whole entry.

This is the lookup, live — reading, pitch accent, meaning, and frequency the instant you touch a word. No dictionary tab, no copy-paste.

Reader — lesson 12

先生せんせいは綺麗きれいな日本語にほんごを話はなす。

↑ hover any word

Dictionary JMdict · Kanjium

// WHAT YOU GET

Everything Japanese learners actually ask for.

Furigana you can turn off

Readings sit above the kanji in subtitles, dialogue, and EPUB. Keep them while you need them, switch them off as you grow.
Pitch accent on every word

Inline graphs from the open Kanjium dataset show the shape of the pitch — so you learn how a word sounds, not just what it means.
One click selects one word

UniDic tokenization splits Japanese where words actually break, and every conjugation — 食べた, 食べて — folds back to 食べる. Tag it once.
Bring your Yomitan dictionaries

Import the term-bank dictionaries you already use, monolingual ones included. JMdict and KANJIDIC2 are built in to get you started.
Kanji at a glance

Tap any kanji for its JLPT level, frequency rank, and readings — straight from KANJIDIC2.
Cards that remember the scene

Export to Anki with furigana, pitch, and the audio clip from the moment you met the word — word-first or sentence-first, via AnkiConnect or .apkg.
Mine anime with no subtitles

Whisper runs on your machine and writes the transcript from raw audio, so you're not limited to shows that already have subs.
Import frequency lists

Load a Yomitan frequency list and Octopus shows each word's rank, so you learn the common words first. Bring whichever one you prefer.

// FAQ

The questions Japanese learners actually have.

The objections immersion learners actually have, answered plainly. Anything missing? Write us at support@octopuslang.com.

Do I get monolingual dictionaries?

JMdict (Japanese→English) and KANJIDIC2 for kanji are built in. For monolingual dictionaries, import any Yomitan-format dictionary — the same files you'd load into Yomitan. They then work offline inside the reader.
Where does the pitch accent come from?

The open Kanjium dataset, drawn inline on every dictionary entry and carried onto your Anki cards.
Can I really mine anime without subtitles?

Yes. Octopus transcribes the audio locally with Whisper, so a show with no subtitle file still becomes a clickable, mineable transcript on your machine.
What about frequency lists?

Import a Yomitan frequency list and Octopus shows each word's rank and a frequency badge. None are bundled — you bring the one you trust.
Does it work with Netflix or Disney+?

Octopus works with files on your computer and with YouTube links. It doesn't bypass DRM, so for streaming services you'd use a file you own.
Is it really a one-time payment?

Yes — one license, paid once, with free updates. No subscription, no per-minute transcription fees.
Is there a mobile app?

Not yet. Octopus is a desktop app for Mac and Windows today.

// TRY IT

Tonight's film can be tonight's lesson.

Download free and bring in 20 videos and 5 books of your own — no card required. One payment unlocks the rest when it earns its place.

Download Octopus

Take Octopus to your desktop.

Drop your email and we'll send the download links to your inbox. Open them when you're back at your computer — free for 20 videos and 5 books.

Everything you need for Japanese. Genuinely in one app.

The immersion setup you'd otherwise build by hand.

It finds the sentences with one new word.

Hover a word. There's the whole entry.

Everything Japanese learners actually ask for.

Furigana you can turn off

Pitch accent on every word

One click selects one word

Bring your Yomitan dictionaries

Kanji at a glance

Cards that remember the scene

Mine anime with no subtitles

Import frequency lists

The questions Japanese learners actually have.

Tonight's film can be tonight's lesson.

Take Octopus to your desktop.