Watch videos — and
pick up a language along the way
Show two subtitle languages at once on Netflix, YouTube, and Coursera. When you don’t understand a line, the translation is right underneath. Want deeper practice? Switch to dictation, speaking, or flashcards.
The free plan includes bilingual subtitles and Google Translate — no account needed.
Where do you watch most?
Choose the closest fit and we’ll point you to the right install link. One edition is enough.
Only need bilingual subtitles on Netflix? Install this one — Chrome, Edge, and Firefox. It’s also the most-used edition.
Works only on Netflix, same engine as the all-in-one edition. Install just one.
Want Netflix, YouTube, and Coursera together? Install the all-in-one edition — simplest setup.
Choose this if you also watch Coursera. Don’t install it alongside a single-platform edition, or you’ll get duplicate subtitles.
Focused on YouTube bilingual subtitles and subtitle enhancement — Chrome, Edge, and Firefox.
Watching YouTube on your phone? Use the mobile version below instead.
Open the web app to watch YouTube with bilingual subtitles on phone or tablet — nothing to install.
Mobile supports YouTube only. For Netflix on a phone, you need the desktop extension.
Bilingual subtitles in a few minutes
- 1
Install your edition
Pick one above — Netflix-only if that’s all you need, or the all-in-one if you also want YouTube and Coursera. One install is enough.
- 2
Choose languages
Click the toolbar icon, then pick primary subtitles and translation in the popup. Add a second language when you want it.
- 3
Watch — or practice
Start casually. When you want more, switch to dictation, speaking, or learning mode for extra rounds.
Built so you understand — and remember
Two languages, clear on one screen
Primary subtitles plus translation, or two languages side by side. Font, size, color, and position are all adjustable — pick a Style Studio preset and get a readable look in seconds.
Meet Style Studio →
Turn favorite clips into words you keep
Tap a word for AI explanations and examples, save flashcards, and review anytime. For focus, use dictation fill-ins or speaking practice — one video, many rounds.
See learning mode →
Turn broken auto-captions into real sentences
YouTube auto-captions often lack punctuation and break oddly. Enhancement adds punctuation and reflows lines so they read like real subtitles — free to use.
About subtitle enhancement →Furigana
Auto furigana or romaji over Japanese kanji.
Subtitle reader
Have the browser voice read the current line aloud.
Keyboard shortcuts
Replay, previous line, delay — one key away.
Selectable text
Select and copy subtitle text directly.
Subtitle list
All lines listed — tap to jump.
Upload & download
Import your own subs or export SRT.
Free works great; membership goes further
No signup, no payment — start with bilingual subtitles. Join when you want stronger translation and AI features.
Free plan
- Bilingual subtitles on Netflix, YouTube, and Coursera
- Google Translate
- YouTube subtitle enhancement (same features as members, free queue)
- All watch & style settings: Style Studio, fonts, shortcuts…
- Dictation and speaking practice
Join via Patreon
Everything in free, plus:
- Advanced engines: AI and AI (batch), plus Azure / DeepL fallback
- Whisper: generate subtitles from audio
- Learning-mode AI: tap-to-explain, examples, flashcards
- Subtitle enhancement on a members-only queue
Patreon is the only subscription channel — no other payments, cancel anytime.
No laptop? Your phone works too
Open the mobile web app for YouTube bilingual subtitles and practice modes — nothing to install. Netflix still needs the desktop extension.
FAQ
Quick answers to the questions we hear most. Full details live on the FAQ page.
See all FAQsWhat’s the difference between RikoSub, Netflix edition, and YouTube edition?
Same core engine. RikoSub all-in-one supports YouTube, Netflix, and Coursera; single-platform editions serve one site. Install only one to avoid duplicate subtitles.
What’s free vs membership?
Free includes bilingual subtitles, Google Translate, and YouTube subtitle enhancement. Members get AI translation (with Azure / DeepL fallback), Whisper, learning-mode AI, and a members-only enhancement queue.
Is Firefox supported?
Netflix and YouTube editions have Firefox builds (121+). RikoSub all-in-one currently focuses on Chrome and Edge.
Can I use it on mobile?
Yes for YouTube — mobile.netflixsubs.app, no install. Netflix on a phone needs the desktop extension.
What permissions does it use?
Mainly storage for your settings, plus permission to run on supported streaming sites. It doesn’t read every site you visit.