Real-time subtitles,
anywhere.
Nyx listens to your system audio or microphone, transcribes speech in real time, and translates it — displayed as a floating overlay that never interrupts your screen.
Free 10 min / day
Everything you need
Powerful AI under the hood, dead-simple interface on top.
Subtitle Overlay
Always-on-top transparent window, click-through — subtitles float over any app without interrupting you.
Multi-language STT
Supports English, Japanese, Chinese, Korean, and more via Whisper AI.
Smart Translation
Translate to Vietnamese or English. Three-layer context system keeps translations accurate and consistent.
System & Mic Audio
Capture audio from any app (ScreenCaptureKit on macOS, WASAPI on Windows) or your microphone.
3-Layer Context
User hint + auto-glossary + bilingual rolling history — translation gets smarter over time.
Session Saver
Automatically save your full subtitle session to a plain-text file after each use.
Customizable Overlay
Adjust opacity, font size, position, and hotkeys to fit your workflow.
Cross-platform
Runs natively on macOS (13+) and Windows.
See Nyx in action
Real-time subtitles floating right over your screen.
Demo video coming soon...
Place video at artifacts/demo.mp4
Simple, no surprises
Monthly subscription. Cancel anytime. Payment via QR code — key delivered instantly.
- All features included
- 10 free minutes per day
- Resets at midnight
- No payment needed
- All features included
- 10 hours per month
- ₫7,000 / extra hour
- Cancel anytime
- All features included
- 30 hours per month
- ₫7,000 / extra hour
- Cancel anytime
- All features included
- Unlimited usage
- Fair-use policy
- Cancel anytime
Open the app → Account tab → choose a plan → scan QR to pay. Key activated automatically.