What's new in the last InterSub update
We regularly add new functionality and features to the app. Below you will find what's new in InterSub lately. If you have a feature request or feedback, you can always send us them via this form.
ver 4.51
New features
1. Telegram bot for word practice
We've launched a Telegram bot for practicing the words you save in InterSub. Once you sync it with your InterSub dictionary, new words go straight into your learning queue. This is the first version, so we're counting on your feedback. If something doesn't work right, let us know. 👉 https://t.me/InterSubWords_bot
Here's how it works:
• Each word is broken down from several angles: the translation, where and when it's used, a few examples in context, and sometimes its etymology when we dug up something interesting.
• Then you write a few examples of your own to make the meaning stick. The bot reviews your answers and points out mistakes in grammar, vocabulary and word usage.
• After that, the word moves into spaced repetition, where the bot checks whether you remember it using three types of questions that rotate.
• The AI tutor that reviews your answers is available any time: just ask. During practice it answers in the context of the current task; between sessions it just answers your language question.
• Before each session, the bot shares a fun fact about the movie or show the session's first word came from.
A note on voice. For navigation, tap the bot's buttons, since that's the easiest way to keep it on track. Everything else (your answers, your example sentences, questions for the tutor) you can just say out loud. If speaking isn't convenient, type it instead. We think this is one of the best things about the bot: you can practice without typing much at all.
The bot itself is free. Syncing your whole InterSub dictionary needs a paid plan. You can also add your own words right in the bot or pick from ready-made topic lists (English only for now).
2. Auto-hide subtitles on YouTube The "Do not show subs in videos in native language" setting used to work only on Netflix. Now it works on YouTube too: when a video plays with audio in your native language, InterSub hides the subtitles for you. If you switch between videos in your native language and the one you're learning, you no longer have to turn subtitles or the extension on and off by hand.
3. New shortcut: Ctrl+I (Cmd+I on Mac) You asked us to change the on/off shortcut, since YouTube already uses the I key for its miniplayer. InterSub now toggles with Ctrl+I, or Cmd+I on Mac. Like before, the shortcut works on every site.
Fixes & improvements
• Reworked subtitle loading on YouTube. We hope this means far fewer failed loads.
• While subtitles load, you'll now see a loading counter and the number of attempts, so if subtitles aren't coming through, you can tell InterSub is still trying.
• Loading failures are now sorted into categories, each with its own message. You'll know why subtitles didn't load in your case and can tell us, so we can look into it.
• Fixed automatic AI translation of second subtitles.
• Turned off word translation in input fields and forms. You told us it got in the way.
1. Telegram bot for word practice
We've launched a Telegram bot for practicing the words you save in InterSub. Once you sync it with your InterSub dictionary, new words go straight into your learning queue. This is the first version, so we're counting on your feedback. If something doesn't work right, let us know. 👉 https://t.me/InterSubWords_bot
Here's how it works:
• Each word is broken down from several angles: the translation, where and when it's used, a few examples in context, and sometimes its etymology when we dug up something interesting.
• Then you write a few examples of your own to make the meaning stick. The bot reviews your answers and points out mistakes in grammar, vocabulary and word usage.
• After that, the word moves into spaced repetition, where the bot checks whether you remember it using three types of questions that rotate.
• The AI tutor that reviews your answers is available any time: just ask. During practice it answers in the context of the current task; between sessions it just answers your language question.
• Before each session, the bot shares a fun fact about the movie or show the session's first word came from.
A note on voice. For navigation, tap the bot's buttons, since that's the easiest way to keep it on track. Everything else (your answers, your example sentences, questions for the tutor) you can just say out loud. If speaking isn't convenient, type it instead. We think this is one of the best things about the bot: you can practice without typing much at all.
The bot itself is free. Syncing your whole InterSub dictionary needs a paid plan. You can also add your own words right in the bot or pick from ready-made topic lists (English only for now).
2. Auto-hide subtitles on YouTube The "Do not show subs in videos in native language" setting used to work only on Netflix. Now it works on YouTube too: when a video plays with audio in your native language, InterSub hides the subtitles for you. If you switch between videos in your native language and the one you're learning, you no longer have to turn subtitles or the extension on and off by hand.
3. New shortcut: Ctrl+I (Cmd+I on Mac) You asked us to change the on/off shortcut, since YouTube already uses the I key for its miniplayer. InterSub now toggles with Ctrl+I, or Cmd+I on Mac. Like before, the shortcut works on every site.
Fixes & improvements
• Reworked subtitle loading on YouTube. We hope this means far fewer failed loads.
• While subtitles load, you'll now see a loading counter and the number of attempts, so if subtitles aren't coming through, you can tell InterSub is still trying.
• Loading failures are now sorted into categories, each with its own message. You'll know why subtitles didn't load in your case and can tell us, so we can look into it.
• Fixed automatic AI translation of second subtitles.
• Turned off word translation in input fields and forms. You told us it got in the way.
ver 4.46
New features
1. New platform support: Bilibili.tv
By popular request, InterSub now supports Bilibili.tv - one of the largest video platforms focused on anime, Asian content, and creator videos.
2. AI-powered dual subtitle translation
Fixes & improvements
1. New platform support: Bilibili.tv
By popular request, InterSub now supports Bilibili.tv - one of the largest video platforms focused on anime, Asian content, and creator videos.
2. AI-powered dual subtitle translation
- Many users asked for a better way to handle mismatched dual subtitles - when the second subtitle track comes from dubbing and differs significantly from the original in wording and timing.
- You can now enable AI-generated second subtitles created on the fly. This provides much closer line-by-line alignment and a more literal translation experience.
- The feature is available in Settings and included in paid plans.
Fixes & improvements
- Improved YouTube subtitle loading logic. The new system is slightly slower, but should significantly reduce subtitle loading failures, including “Loading subtitles” and “Your IP was blocked by the service” errors.
- Fixed subtitle display issues on Amazon Prime, Crunchyroll, and Learn.cantrill.io.
ver 4.34
New features
1. Subtitle appearance customization
You asked – we listened. You can now customize how subtitles look, right from the subtitle settings menu.
Here’s what you can change:
If hover translation wasn’t ideal for you, you can now turn it off and get translations by selecting words or phrases instead.
Just double-click to select a single word, or select any part of the subtitle manually.
When using this mode, the video will pause only after you finish the selection.
Fixes & improvements
1. Subtitle appearance customization
You asked – we listened. You can now customize how subtitles look, right from the subtitle settings menu.
Here’s what you can change:
- Subtitle background opacity – all the way down to 0 for a transparent look
- Font size – for both lines if dual subtitles are enabled
- Text color – individually for each language
- Text outline color – also individually for each language in dual subtitle mode
If hover translation wasn’t ideal for you, you can now turn it off and get translations by selecting words or phrases instead.
Just double-click to select a single word, or select any part of the subtitle manually.
When using this mode, the video will pause only after you finish the selection.
Fixes & improvements
- Fixed subtitle display issues on Amazon Prime.
ver 4.27
New platforms: Domestika, Shahid, and DW Learn German
We’ve expanded InterSub to work on three new platforms:
New features
Fixes & improvements
We’ve expanded InterSub to work on three new platforms:
- Domestika – learn creative skills with dual subtitles,
- Shahid – watch regional shows and movies with translation support,
- DW Learn German – study German 🇩🇪 while improving your listening skills.
New features
- We’ve reworked how subtitles are retrieved on YouTube. Subtitle loading errors should now happen much less frequently – especially on longer videos or slower connections.
- You’ll now get a notification when a new version of InterSub is available – both in the Settings and on the extension icon.
Fixes & improvements
- Fixed an issue on HBO Max where subtitles could appear duplicated or mixed up.
- Reduced how often the error popup appears when subtitle loading fails on YouTube – it should no longer interrupt your viewing experience as frequently.
ver 4.25
More reliable subtitles on YouTube
YouTube has been changing how it delivers subtitles to the player recently. This led to errors for some users - depending on browser, location, video length, or connection speed - when InterSub was trying to load subtitles.
We’ve introduced a new method for subtitle retrieval to significantly reduce subtitle loading issues, especially for auto-generated and auto-translated subtitles.
Turn off hover translation in subtitles
Prefer less distraction? You can now disable word translation on hover in the Settings and use double-click or text selection instead – it’s completely up to you.
Performance and stability improvements
We’ve made several under-the-hood enhancements to keep InterSub smooth, fast, and stable - along with minor fixes across supported platforms. Instant word translation - now works across all supported browsers.
YouTube has been changing how it delivers subtitles to the player recently. This led to errors for some users - depending on browser, location, video length, or connection speed - when InterSub was trying to load subtitles.
We’ve introduced a new method for subtitle retrieval to significantly reduce subtitle loading issues, especially for auto-generated and auto-translated subtitles.
Turn off hover translation in subtitles
Prefer less distraction? You can now disable word translation on hover in the Settings and use double-click or text selection instead – it’s completely up to you.
Performance and stability improvements
We’ve made several under-the-hood enhancements to keep InterSub smooth, fast, and stable - along with minor fixes across supported platforms. Instant word translation - now works across all supported browsers.
ver 4.25
More reliable subtitles on YouTube
YouTube has been changing how it delivers subtitles to the player recently. This led to errors for some users - depending on browser, location, video length, or connection speed - when InterSub was trying to load subtitles.
We’ve introduced a new method for subtitle retrieval to significantly reduce subtitle loading issues, especially for auto-generated and auto-translated subtitles.
Turn off hover translation in subtitles
Prefer less distraction? You can now disable word translation on hover in the Settings and use double-click or text selection instead – it’s completely up to you.
Performance and stability improvements
We’ve made several under-the-hood enhancements to keep InterSub smooth, fast, and stable - along with minor fixes across supported platforms. Instant word translation - now works across all supported browsers.
YouTube has been changing how it delivers subtitles to the player recently. This led to errors for some users - depending on browser, location, video length, or connection speed - when InterSub was trying to load subtitles.
We’ve introduced a new method for subtitle retrieval to significantly reduce subtitle loading issues, especially for auto-generated and auto-translated subtitles.
Turn off hover translation in subtitles
Prefer less distraction? You can now disable word translation on hover in the Settings and use double-click or text selection instead – it’s completely up to you.
Performance and stability improvements
We’ve made several under-the-hood enhancements to keep InterSub smooth, fast, and stable - along with minor fixes across supported platforms. Instant word translation - now works across all supported browsers.
ver 4.21
New platforms:
We’ve expanded InterSub to work on two new platforms:
You can now translate any word or phrase on any website — not just in videos — directly in Chrome, Edge, and Firefox and so on.
Smart fallback for dual subtitles
When one of the subtitle languages is missing, InterSub now automatically translates it. Now this works for both the main and the second subtitle — making sure you always see both lines, even if the video only offers one.
Fixes & improvements
We’ve expanded InterSub to work on two new platforms:
- HBO Max — watch your favorite shows with dual subtitles and instant translation
- learn.cantrill.io — perfect for tech learners who want to pick up English while mastering AWS
You can now translate any word or phrase on any website — not just in videos — directly in Chrome, Edge, and Firefox and so on.
Smart fallback for dual subtitles
When one of the subtitle languages is missing, InterSub now automatically translates it. Now this works for both the main and the second subtitle — making sure you always see both lines, even if the video only offers one.
Fixes & improvements
- Better word translation on websites, especially in Firefox, Reddit, and GitHub
- Fixed subtitle loading issues on YouTube videos with long ads
ver 4.13
Words translation on websites (Firefox only, beta version)
- It works just like subtitle translations — simply highlight a word or phrase, click the IS icon next to the selection, and you’ll get a bubble showing the translation of both the selected text and its context.
- While this feature is designed to work across all websites, please note that it’s currently in beta, so you may encounter some minor issues. We’re releasing it now to gather your feedback and improve the experience.
- If you have automatic saving enabled, translated words are stored in your vocabulary (wordbook). For each saved word, we log the website’s name and a link to the exact page where you translated it, making it easy to revisit.
ver 4.6
New features in AI Language Buddy
- Type your own questions in the Language Buddy chat. Useful when preset options don’t cover your case — just type your custom question and get Buddy's answer.
- Save a dictionary-style definition from the chat to your personal vocabulary. Helps capture clean, structured entries (word, part of speech, translation, short meaning) extracted from the chat explanation.
- Shortcut to toggle dual subtitles (D key). Allows quick switching on and off during playback without a need to open Settings.
- Automatic translation from Traditional to Simplified Chinese. Applies when a video doesn’t have simplified subtitles available.
ver 4.1
AI Language Buddy explains language nuances
- Now, when you highlight a word or phrase in subtitles, you’ll see the familiar translation bubble — and a new “Magic” button right next to it.
- Tap it to open a chat with your AI Language Buddy, where you can choose from four of the most common questions language learners ask:
- What does this word or phrase mean in context?
- How do I use this word or phrase?
- What are some synonyms or related expressions?
- What’s the grammar role or structure here?
- The answers appear instantly, helping you understand meaning, usage, and grammar — all without leaving your video. For now, the chat is session-based and doesn’t store your history.
- In our nearest plans to add an option to write your own question to the chat, save an explanation you liked to your wordbook and access a history of chats in your Personal account.
ver 3.109
Subtitles AI translation on the fly
- In case you watch with dual subtitles and your video doesn't have subs in your native language now we will try translating into it in real time.
- This feature is in beta, so please let us know if you have any issues, this will help us improve it.
- We are considering adding additional translation engines like DeepL, ChatGPT and so on and will appreciate your feedback on this in a short survey here.
- We've enrolled a new, more accurate lemmatization algorithm (which determines the base form of a selected word for translation) for the following languages: English, Spanish, German, French, Russian, Italian, Polish, Dutch. Improvements for Japanese, Korean, Chinese and Indonesian are on the way. This will improve the quality of word translation.
ver 3.105
InterSub now supports Anki, the go-to flashcard apps with millions of users worldwide!
- Now you can synchronize your saved words from wordbook with any of Anki apps, both desktop and mobile, in one click.
- To start syncing your words, follow the setup instructions in English here. If you already have some Anki decks, don't forget to make a backup before the first sync, just in case.
- Fixed words splicing in some subtitles on Prime Video under some specific conditions.
ver 3.87.0
New platform support: Crunchyroll
- Enjoy the largest collection of anime in one place! Now you can feel more confident watching videos that don't have dubbing/subtitles in your language, using English instead, which is always available.
- Improved long subtitles auto-fitting into two lines (to help you read them with ease): now it works more cleared and efficiently.
ver 3.78.0
New feature: ad supported unlimited lookups on free plan
- Look up any word or phrase without limits
- Perfect for casual learners exploring new content
- Ad-free experience
- Personal vocabulary with saved translations
- Words export and mobile apps and Telegram bots
- Shadowing: now works more precisely on all the platforms
ver 3.70.0
New features
1. Udemy Support: Access thousands of courses on one of the most popular learning platforms.
2. Dual Subtitles Mode: Now you can display subtitles only during pauses.
3. Shadowing (Beta): Auto-pause after each subtitle to let you repeat. Set a delay between 1x to 2x the subtitle's length.
4. Hot keys! Use your keyboard to adjust settings:
5. Previous Subtitles on Pause: Now we display previous subtitle even if there’s no current one.
6. Amazon Prime Support: Fixed a bug affecting the correct functionality of Amazon's cart.
1. Udemy Support: Access thousands of courses on one of the most popular learning platforms.
2. Dual Subtitles Mode: Now you can display subtitles only during pauses.
3. Shadowing (Beta): Auto-pause after each subtitle to let you repeat. Set a delay between 1x to 2x the subtitle's length.
4. Hot keys! Use your keyboard to adjust settings:
- Resize main and secondary subtitles using keys (=) / (-) for main and (shift) + (=) / (-) for second subtitles, increasing / reducing respectively
- Adjust subtitle vertical position with (arrow up) or (arrow down)
- Toggle shadowing on/off with (s) key
- Toggle extension on/off using (i) key
5. Previous Subtitles on Pause: Now we display previous subtitle even if there’s no current one.
6. Amazon Prime Support: Fixed a bug affecting the correct functionality of Amazon's cart.
ver 3.64.0
1. Previous subtitle is now shown on pause to help you not to miss a word you've been about to look up. You can switch this feature off and on in Settings.
2. Improvements in Amazon Prime support.
2. Improvements in Amazon Prime support.
ver 3.61.0
Added additional control on subtitles appearance:
English-Vietnamese dictionary
- choice between wide and narrow background
- auto-pause switching off/on
English-Vietnamese dictionary
ver 3.57.0
Now we work on LinkedIn Learning platform.
ver 3.54.0
We have added the ability to align subtitles vertically. So if you have long wanted to have subs lower (or, suddenly, higher?) on any of the supported sites, now you can do it in the Settings.
We've also added full support for RTL languages, like Hebrew or Arabic. Now, when you translate into these languages, everything is shown correctly everywhere in the UI.
We've also added full support for RTL languages, like Hebrew or Arabic. Now, when you translate into these languages, everything is shown correctly everywhere in the UI.
InterSub Inc.
☂︎ 220 East 23rd Street, Suite 400. New York, NY 10010
© 2025 All rights reserved
☂︎ 220 East 23rd Street, Suite 400. New York, NY 10010
© 2025 All rights reserved
