Real-time Dual Subtitles Real-time
Side-by-side native and translated subtitles with dark glassmorphism styling, auto-scrolling, and interactive seek-on-click.
Chrome Extension AI Video Assistant 2026
Bilingual Subtitles & Real-time AI Video Dubbing
Context-aware dual subtitles, 1-click hover dictionary, and natural Neural voice dubbing on YouTube, Coursera, Udemy, Netflix, and every HTML5 video player.
- Zero complicated API keys required
- Automatic HTML5 video hook on YouTube, Netflix & Coursera
- 50 complimentary credits on signup
"Artificial intelligence transforms the way we absorb knowledge from international lectures."
"Trí tuệ nhân tạo thay đổi hoàn toàn cách chúng ta tiếp thu tri thức từ các bài giảng quốc tế."
All-in-one AI Suite
Transform Any Foreign Video Into Your Personalized Language Lab
No more language barriers when mastering programming, data science, or enjoying international entertainment.
Natural Neural Voice Dubbing Neural Voice
Expressive neural speech synthesis with lifelike emotional inflection, proper pauses, and native accent fluency.
Sync Buffer Pacing Smart Sync
Proprietary streaming buffer synchronizes speech rate and subtitle timing seamlessly to match video frame movement.
Smart Audio Ducking Smooth Ducking
Automatically ducks original video volume to 15% when AI speaks, restoring 100% volume upon sentence completion.
Interactive Transcript & Flashcards Interactive
Slide-out transcript drawer for full keyword search, hover dictionary definitions, and one-tap flashcard generation.
Universal Video Player Support Universal
Works reliably on YouTube, Coursera, Udemy, edX, Khan Academy, Facebook Watch, and custom HTML5 video elements.
Contextual Subtitles
Silky Smooth Bilingual Captions
Unlike clunky machine translations, VidFlow understands industry context to accurately translate technical, scientific, financial, and colloquial video speech in real time.
- Dual display of original dialogue alongside polished translations
- Instant hover dictionary with phonetic IPA and contextual definitions
- Customizable font sizing, glass opacity, and draggable positioning
YouTube CC Hook
Latency: 48ms
"Next-generation transformer models achieve unprecedented accuracy in semantic understanding."
"Các mô hình Transformer thế hệ mới đạt độ chính xác chưa từng có trong việc hiểu ngữ nghĩa."
✓ Whisper V3 Turbo
✓ Zero Memory Leak
✓ DRM Protected Video Ready
Smart Voiceover
Audio Ducking & Expressive Neural Dubbing
Intelligent Audio Ducking ducks original audio to 15% volume whenever neural dubbing speaks. Enjoy natural prosody, realistic pauses, and human-like emotional cadence.
- Ultra-low streaming buffer under 0.8s for tight lip synchronization
- Toggle between background audio ducking or 100% voiceover isolation
- Save dubbed audio tracks into your Library for offline playback
Neural Voice Engine
Buffer: 0.8s
Original Video Audio:
Ducked to 15%
AI Neural Dubbing:
Active (100% Crisp)
Direct Comparison
How Does VidFlow Stand Out?
Comparison matrix between VidFlow and standard browser caption tools.
| Feature | VidFlow Extension | YouTube Default CC | Legacy Extensions |
|---|---|---|---|
| Dual bilingual subtitles | ✓ Side-by-side dual | ✕ Single language only | ✓ Basic layout |
| Real-time AI Voice Dubbing | ✓ Yes (Smart Ducking) | ✕ Not supported | ✕ None |
| Hover instant dictionary | ✓ IPA + Contextual | ✕ Non-interactive | △ Slow popup |
| Whisper ASR for non-caption videos | ✓ Automatic 98% accuracy | ✕ Uploader-dependent | ✕ Not supported |
| Flashcard deck & Script drawer | ✓ Built-in & Cloud sync | ✕ None | ✕ Requires third-party app |
| Works on Netflix & Coursera | ✓ All HTML5 players | ✕ YouTube only | △ Limited sites |
PRICING & PLANS
Transparent Pricing · Choose Your Billing Model
Choose between flexible Pay-As-You-Go credit packs (no recurring fees, never expire) or fixed Monthly Subscriptions (with daily free AI quotas).
Pay As You Go Advantages:
You only top up when needed. There are zero recurring auto-charges to your card. Purchased credits never expire and are shared across all 5 AxioAPI products.
✓ Zero auto-renewal
✓ Credits never expire
✓ Shared across 5 Axio apps
✓ Instant 10s activation
$2
Standard
Approx 52,000 VND
2,000 credit
Permanent AxioAPI credits
- No recurring fees (One-time payment)
- Never expires (Lifetime balance)
- AI bilingual subtitles on YouTube & Coursera
- Natural Neural Dubbing AI voiceover
- Usable on DocFlow, Proxy, Leads & Hub
- Instant 10s activation via VietQR & Cards
$5
Standard
Approx 130,000 VND
5,000 credit
Permanent AxioAPI credits
- No recurring fees (One-time payment)
- Never expires (Lifetime balance)
- AI bilingual subtitles on YouTube & Coursera
- Natural Neural Dubbing AI voiceover
- Usable on DocFlow, Proxy, Leads & Hub
- Instant 10s activation via VietQR & Cards
$10
Standard
Approx 260,000 VND
10,000 credit
Permanent AxioAPI credits
- No recurring fees (One-time payment)
- Never expires (Lifetime balance)
- AI bilingual subtitles on YouTube & Coursera
- Natural Neural Dubbing AI voiceover
- Usable on DocFlow, Proxy, Leads & Hub
- Instant 10s activation via VietQR & Cards
$25
+10% Bonus
Approx 650,000 VND
27,500 credit
Includes 2,500 bonus (+10%)
- No recurring fees (One-time payment)
- Never expires (Lifetime balance)
- Bonus +10% complimentary credits
- AI bilingual subtitles on YouTube & Coursera
- Natural Neural Dubbing AI voiceover
- Usable on DocFlow, Proxy, Leads & Hub
- Instant 10s activation via VietQR & Cards
$50
+20% Bonus
Approx 1,300,000 VND
60,000 credit
Includes 10,000 bonus (+20%)
- No recurring fees (One-time payment)
- Never expires (Lifetime balance)
- Bonus +20% complimentary credits
- AI bilingual subtitles on YouTube & Coursera
- Natural Neural Dubbing AI voiceover
- Usable on DocFlow, Proxy, Leads & Hub
- Instant 10s activation via VietQR & Cards
$100
+30% Bonus
Approx 2,600,000 VND
130,000 credit
Includes 30,000 bonus (+30%)
- No recurring fees (One-time payment)
- Never expires (Lifetime balance)
- Bonus +30% complimentary credits
- AI bilingual subtitles on YouTube & Coursera
- Natural Neural Dubbing AI voiceover
- Usable on DocFlow, Proxy, Leads & Hub
- Instant 10s activation via VietQR & Cards
SIDE-BY-SIDE COMPARISON
Pay As You Go vs. Monthly Subscription: Which is Right for You?
Clear breakdown to help you pick the most cost-effective and flexible option for your workflow:
| Comparison Factor | ⚡ Pay As You Go (Credit Packs) | 🔄 Monthly Subscription (Pro Plans) |
|---|---|---|
| Billing Mechanism |
One-time payment Zero automatic recurring charges. Pay only when you want to top up. |
Monthly or Annual Recurring Auto-renews each billing cycle. 1-click cancellation anytime in portal. |
| Credit Expiration |
♾️ LIFETIME Credits never expire. Keep your balance indefinitely with zero time limits. |
⏳ MONTHLY CYCLE Package credits and daily free AI allowances reset at each monthly cycle. |
| Daily Free AI Runs |
Consumed from purchased balance 1 credit = 10 mins video translation (~$0.001). Zero waste when idle. |
🎁 10 - 60 Free AI Runs Daily Refreshed every 24h without deducting from your credit balance. |
| Cost Efficiency | +10% to +30% bonus credits on packs from $25 |
Save up to 60% overall Much more economical for consistent daily studying or video workflows. |
| Ecosystem Scope | Shared across all 5 apps: VidFlow, DocFlow, Proxy, Leads, Hub | Dedicated to VidFlow quotas + shared credit wallet |
| Cancellation Policy | No cancellation needed (Zero lock-in) |
1-click cancel anytime Cancel directly from your user portal with no hidden penalties. |
| Best Suited For |
Occasional & flexible users Users with bursty needs, project-based work, or wanting zero recurring charges. |
Students, educators & power creators Anyone watching online courses or translating videos daily wanting max value. |
See full pricing details, cost breakdown & payment gateways →
Guides & Knowledge Base
In-depth Video Learning & AI Dubbing Guides
Practical guides on language learning through video, bilingual captions setup, and optimizing real-time neural dubbing.
Study Guide
How to Enable Dual Subtitles on YouTube & Online Courses (2026)
Complete guide to turning on dual subtitles for YouTube, Coursera, Udemy, and Netflix. Real-time bilingual captions with instant dictionary lookups.
Read guide →
AI Technology
Real-time AI Video Dubbing with Neural Voices (2026 Guide)
Discover next-generation AI video dubbing. Automatically duck original audio and stream lifelike localized neural voiceovers in real time.
Read guide →
Language Learning
Master Any Language with YouTube & AI Tools (2026 Guide)
Triple your language acquisition speed with YouTube and AI. Learn how to extract transcripts, practice shadowing, and build flashcards automatically.
Read guide →Frequently Asked Questions
Does VidFlow work on YouTube and online course platforms?
Yes! VidFlow automatically hooks into native player tracks on YouTube, Coursera, Udemy, and HTML5 video players. Toggle dual subtitles or neural dubbing directly from the floating dock toolbar.
How does original audio ducking work?
When the AI neural voice speaks, VidFlow smoothly ramps the original video volume down to 15% (or mutes it completely based on your settings) within 200 milliseconds. When the voiceover finishes, it smoothly restores full volume.
How does credit consumption work?
Watching original subtitles is 100% free. AI translation costs just 0.2 credit per minute. Neural dubbing costs 1.2 credits per minute. Once cached, previously translated video cues are free forever!
Are there recurring monthly subscription traps?
No! VidFlow uses a flexible Pay-As-You-Go model. Purchase credits whenever you need them—they never expire. No hidden recurring fees or monthly lock-in.
Ready to Unlock Knowledge in Any Language?
Install the VidFlow Chrome extension today and experience video learning with live dual subtitles and neural dubbing.
