CaptionGo v1.0 Release Notes

First release of CaptionGo — bilingual subtitles and real-time AI captions for any video, on PC and mobile browsers.

• Prime Video control-bar button: the bilingual subtitle button now appears next to the fullscreen button
• BBC News / iPlayer Toucan Player subtitle support
• A+E Networks site support: HISTORY, A&E, Lifetime, and FYI
• Paramount Avia player support for Nick and other Paramount brand sites
• Multi-rule subtitle matching: when the primary parser fails, CaptionGo automatically tries alternative subtitle formats to reduce missed captions
• ABC News and related sites: subtitle button in the Disney Web Player control bar with m3u8 segmented subtitle support
• Aftonbladet TV, VGTV, and other Nordic media site control-bar button support
• Live Captions now supports "Auto (Detect Language)" mode — automatically detects the spoken language in the video and selects the best speech recognition model, supporting 50+ languages. A two-phase detection flow quickly identifies the language and then verifies accuracy, auto-correcting if the initial detection was wrong
• DASH segmented MP4 subtitle format (stpp/TTML) parsing support for sites like play.joj.sk

• Rebuilt control-bar button insertion for better reliability across sites
• Improved THEOplayer compatibility: dedicated caption detection and button placement, avoiding conflicts with generic Video.js rules
• Updated Prime Video caption selectors for the latest page layout
• Live Captions shows clear real-time status during language detection: detecting, verifying, and confirmed indicators keep you informed throughout the process

• Fixed control-bar buttons being unclickable on certain Shadow DOM-based player sites
• Fixed Live Captions not detecting or correcting when the wrong language was selected — now auto-switches to the correct language
• Fixed DASH video predownload failing due to segment data decoding errors
• Fixed Live Captions status icon still showing active after repeated connection failures

• Media Chrome player support: the bilingual subtitle button appears next to captions or fullscreen in the control bar
• Control-bar buttons on more online video players and embed sites

• More reliable entry button: if the control bar is missing or not ready, CaptionGo shows a corner or floating button, then switches back when the control bar appears
• A single video on the page still gets an entry button even when the player looks small on a large screen

• Fixed sites where neither the control-bar button nor the floating button appeared
• Fixed the button jumping around inside some player control bars

• Subtitle navigation buttons: previous, replay, and next — quickly browse through subtitle content (shortcuts A / S / D)
• Subtitle auto-pause: automatically pauses the video at the end of each subtitle line for sentence-by-sentence study (shortcut Q)
• Copy subtitle button: copy the current subtitle text with one click (shortcut Ctrl+C)
• Subtitle drag handle: hover over subtitles to reveal a drag handle for repositioning
• Caption width control: drag a slider in caption style settings to adjust maximum subtitle width (50%–100%) (Pro)
• 7 new font options: Poppins, Quicksand, Sofia Sans, DM Sans, Montserrat, Open Sans, and Lato
• Thin (100) and Extra Light (200) font weight options — weight menu now shows numeric values
• Uscreen video player support

• Upgraded to variable fonts: font weights transition smoothly from 100 to 900 for a more refined look
• Updated caption color palette with softer, modern tones for improved readability and visual comfort
• Better multi-line bilingual subtitle positioning: subtitles no longer overflow the video bottom or get obscured by controls — multi-line content grows upward
• Smoother caption drag interaction with improved stability
• Better compatibility for menus and popups being hidden on some sites
• More reliable auto-upgrade from floating button to control bar button

• Fixed caption position showing 10% in the menu when set to 0%
• Fixed caption position flickering on hover

• Crunchyroll subtitle support (Pro): Crunchyroll uses hard-rendered subtitles, so the free page-subtitle mode is not available
• 20+ new player integrations: including Vimeo, BBC iPlayer, Wistia, ArtPlayer, NPlayer, Shaka Player, Bitmovin, Clappr, ARD/ZDF Mediathek, and more
• Caption track type recognition: automatically distinguishes between standard subtitles, CC/SDH closed captions, and ASR auto-generated subtitles, with [CC] / [ASR] badges in the menu
• Smart caption selection: prefers standard dialogue subtitles for translation to improve quality

• Better button compatibility: adapts to more player layouts and Shadow DOM scenarios
• Floating button fallback for unconfigured sites: reduces wait time for subtitle access
• Smarter video change detection and caption caching: reduces unnecessary subtitle reloads
• Improved subtitle recognition on Bilibili, Disney+, Hulu, VK Video, MediaElement.js, and more

• Better bilingual subtitle stability: automatically retries when translation temporarily fails, preventing subtitles from showing only the original language for extended periods
• Faster subtitle recovery after seeking: bilingual subtitles reappear more quickly after scrubbing the progress bar
• Improved SPA site support: bilingual subtitles now automatically restart after page navigation on sites like SVT Play
• Clearer language menu labels: "Native Language" renamed to "Translate to", "Learning Language" renamed to "Subtitle Language" for better clarity

• Fixed bilingual subtitles stopping on some sites after long periods without subtitle content
• Fixed outdated subtitle container selectors for SVT Play

• Live Captions (ASR) is now a PRO-only feature: Due to rising speech recognition service costs, Live Captions now requires a PRO membership. We sincerely apologize for the inconvenience. PRO members can continue using both the built-in cloud recognition and custom API key modes

• Netflix smart subtitle preloading: automatically downloads and caches both native and learning language subtitles simultaneously when watching Netflix, eliminating translation wait times
• New "Learning Language" setting in the menu, with clear descriptions for Source Language, Native Language, and Learning Language

• Prefer human-translated subtitles: when official subtitles in your native language are available, they are used directly instead of calling a translation service

• Fixed Simplified Chinese subtitles occasionally displaying as Traditional Chinese when set as native language

• Independent "Live Captions" menu — quickly enable and configure real-time captions without navigating into subtitle settings
• Douyin, Douyin Live, and TikTok one-click bilingual subtitle button

• Vertical video caption font size auto-adjusts for consistent readability across landscape and portrait orientations
• Improved subtitle button display reliability

• Fixed subtitle loading failures on some sites

• One-click bilingual subtitle button added to player controls on Kick, Twitch, Sooplive, Naver, ACFun, MangoTV, iyf.tv, Bahamut Anime Crazy
• Sooplive subtitles now viewable in Picture-in-Picture mode

• Unified subtitle button position on YouTube, Bilibili and other sites — now appears next to the fullscreen button for better discoverability
• Faster and more reliable subtitle button display, reducing cases where the button occasionally fails to appear

• In-page menu now includes a Message Center for viewing promotions and notifications directly on-site

• Fixed ASR status icon overlapping with the video button, making it unclickable
• Faster subtitle tracking — reduces delay when page subtitles update

• Renamed "Built-in AI" to "Browser AI Translation" for better clarity
• Improved Browser AI Translation stability with reduced memory usage from translation models
• Better progress notifications during translation model downloads
• Enhanced video detection: automatically scans pages and inserts subtitle buttons when streaming requests are detected, improving compatibility with modal popups and dynamically loaded videos

• Fixed apostrophes and special characters occasionally displaying as garbled text in translation results
• Improved ASR error messages for protected videos with step-by-step guidance: prompts users to click the extension icon for authorization before retrying, and suggests disabling hardware acceleration when audio capture is silent
• Fixed Pre-download mode wasting bandwidth and CPU on DRM-encrypted videos (Widevine/PlayReady) by automatically falling back to realtime capture

• CaptionGo AI Translation: try AI-powered translation instantly without any configuration
• Predownload mode for Live Captions — full video captions prepared in advance for smoother playback
• RTL language support (Arabic, Hebrew) for subtitle display

• Live Captions now auto-retries on unexpected disconnections — fewer interruptions
• Shows a Retry button when Live Captions stops unexpectedly
• Faster wrong-language detection with quick language switch prompt
• Shows "All captions ready" status when predownload completes
• Better language auto-detection accuracy

• Fixed Live Captions stopping silently without any user notification
• Fixed Live Captions remaining in active state after background connection drops

• Bilingual subtitle support for Reddit videos
• Bilingual subtitle support for YouTube embedded players (iframe embed)

• Fixed duplicate subtitles when both bilingual captions and the player's native captions are enabled

• Mux Player support for education platforms like codewithantonio.com, m.academy, and laracasts.com
• Bilingual subtitle translation for non-traditional learning platforms like Scrimba

• Fixed subtitle button not showing on certain video players

• Expanded subtitle support for more video sites (BBC, Paramount+, Plex, MUBI, Naver TV, Weverse, HIDIVE, Peacock, NowTV, etc.)

• Fixed subtitles not displaying correctly on certain news sites (e.g. ABC News)
• Fixed "Page Subtitle" mode not showing subtitles on some sites

• Better subtitle detection on sites where the player loads slowly

• Shows a "Translating..." placeholder during first translation attempt, so you know translation is in progress
• Automatically notifies you when the translation service is slow to respond
• Proactively shows "Translation skipped" when the video language matches your target language

• Fixed custom fonts not working correctly on Firefox
• Fixed button position showing incorrectly on some sites

• Fixed X (Twitter) not correctly selecting track subtitles
• Fixed membership dialog being obscured

• Floating button now shows on hover and hides automatically when the cursor moves away, reducing video obstruction
• Removed the always-visible browser-side floating button; now shows a quick-access button on each video instead

• Fixed touch interaction issues with the floating button on mobile devices
• Fixed login button requiring long press to respond when using with Gestify in mobile fullscreen
• Fixed multiple login windows opening when multiple RabbitPair extensions are installed

• Fixed subtitles being lost after exiting fullscreen, unable to recover when re-entering fullscreen
• Fixed fullscreen menu button not showing or appearing in wrong position on certain websites
• Fixed fullscreen menu button not showing after navigating to a new video within the same page

• Extended subtitle cache duration for uninterrupted viewing of long videos

• Fixed an issue where the CaptionGo menu button could not be tapped when watching video in fullscreen on Android Firefox
• Fixed bilingual subtitle detection failing on certain websites (e.g. React/SPA-based streaming sites)
• Fixed subtitle loading failures on Firefox
• Fixed original subtitles still showing after bilingual captions are enabled

• Improved subtitle experience on X (Twitter) timeline videos
• Expanded subtitle support for more websites

• Bilingual subtitles: Automatically show "original + translation" on web videos, or view translation-only or original-only; works on major platforms like YouTube, Netflix, Disney+, Hulu, and Bilibili as well as ordinary web videos, and hides the site's own subtitles to avoid overlap.
• Smart sentences: Automatically merges fragmented, word-by-word captions into smooth, complete sentences.
• Real-time voice captions: Turn speech into subtitles and translate them even for videos without captions. Use the built-in service for free, or add your own Deepgram key / connect a local transcription backend — 50+ languages supported.
• Multiple translation services: Built-in free translation via Google, Microsoft, Yandex, and Chrome; or connect AI models like OpenAI, Claude, Gemini, and Ollama with a customizable translation style. Automatically falls back to a backup service when the current one is unavailable.
• Meeting captions: Automatically display a translation beneath the captions in Zoom, Microsoft Teams, Google Meet, and Twitter Spaces (off by default; turn on the meeting's own captions first).
• Rich caption styling: Freely adjust font, size, color, stroke, background, and position; style the original and translation separately; drag to reposition and remember it per site.
• Floating button: A draggable, collapsible floating button on any web page lets you turn captions on anytime, and can be hidden on specific sites.
• Mobile fullscreen support: Captions and settings work the same way when watching video in fullscreen on mobile browsers.
• Keyboard shortcuts: Toggle bilingual subtitles and live voice captions with one key; shortcuts are customizable in your browser's extension shortcut settings.
• Cloud sync (PRO): End-to-end encrypted sync of your settings and API keys — switch computers or sign in on mobile with the same account to sync automatically, with no reconfiguration.
• Account & membership: Sign-in, trial, and subscription supported.
• Multi-browser & multilingual: Supports Chrome, Edge, Whale, and Firefox (including Android), with a multilingual interface.
• X (Twitter) timeline video bilingual subtitles: a subtitle button appears at the top-right corner of each video, automatically follows the currently playing video as you scroll, and supports auto-enable in site settings.