# Show HN: NexSub – 100% offline real-time translation tool using local Whisper

> Source: <https://steelsoft.site/software/NexSub_home.html>
> Published: 2026-07-17 01:16:09+00:00

### NexSub: The World’s First Fully Offline AI Video Subtitle Translator

Enjoy accurate, real-time multilingual subtitles for any video in complete privacy. Break down language barriers instantly, 100% locally on your machine—no internet required, no subscriptions needed.

Have you ever experienced these frustrating moments?

- **The Language Barrier:** Found an incredible YouTube tech tutorial or regional indie film, but the creator speaks a language you don’t understand, and there are no subtitles available.

- **The Commute Blackout:** Wanted to watch downloaded courses or documentaries during a flight or subway commute, but online translation tools stopped working without Wi-Fi.

- **The Privacy Nightmare:** Need to process confidential corporate training, legal depositions, or internal materials, but company policy strictly forbids uploading sensitive data to third-party cloud AI services.

**If any of these sound familiar, NexSub was built for you.**

## 🚀 Why Choose NexSub?

### 🔒 100% Private & Local-First

Every second of your video and every byte of system audio stays on your computer. With **zero data leakage** and military-grade privacy by design, your viewing history and sensitive data remain yours alone.

### 🌐 100+ Languages Supported

Powered by advanced local AI models, NexSub seamlessly handles everything from global mainstream languages (English, Spanish, Mandarin, French, Japanese) to regional dialects and niche accents.

### ⚡ True Real-Time, Zero-Cloud Costs

By capturing your system's soundcard (Stereo Mix) directly, NexSub generates subtitles on the fly like a personal interpreter. No cloud APIs, no per-minute transcription fees. **Run it forever, for free, after download.**

### 🎯 Universal Compatibility

One-click start. Since it captures raw system audio, it works universally with **YouTube, Netflix, Zoom meetings, Coursera, VLC player, or any local media file**.

## 🛠️ Core Application Scenarios

| **Scenario** | **The Problem** | **The NexSub Solution** |
|---|---|---|
| **Global Online Video** | Missing platform closed captions or poor auto-translation quality. | Turn on **"Real-Time Mode"** to capture system audio. Instant subtitles appear over YouTube, Netflix, or live streams. |
| **Local Media Files** | Hard-to-find `.srt` files; manual synchronization takes hours. | Just play the video. NexSub listens and translates in real-time as the video runs. |
| **No-Internet Zones** | Cloud-based translation apps are useless on planes or remote areas. | NexSub runs completely offline. Watch and translate downloaded files anywhere, anytime. |
| **Confidential Content** | High risk of data leaks when uploading internal assets to the cloud. | Enterprise-grade security. 100% local processing complies with strict corporate data governance. |

- **Bilingual Display Support:** Display both the original spoken language and your translated language simultaneously—perfect for language learners and international teams.

- **One-Click Subtitle Export:** Export the locally generated transcripts into standard `.srt` or `.vtt` formats instantly after watching.

- **Low-Latency Architecture:** Optimized local AI inference ensures the latency between audio and subtitle generation is kept under **1.5 seconds** for a seamless viewing experience.

## 💻 Hardware Requirements & Performance Notice

NexSub leverages your local GPU capability to run cutting-edge AI translation models locally.

- **Minimum Configuration:** NVIDIA GTX 1660 / RTX 2060 (6GB VRAM) — _Suitable for standard speed and mainstream language models._

- **Recommended Configuration:** NVIDIA RTX 3060 / 4060 or higher (8GB+ VRAM) — _Unlocks high-precision large models and ultra-low latency real-time translation._

> **Supported Graphics Cards:** >

> - **RTX 30 Series:** RTX 3050 (8GB) up to 3090 Ti >

> - **RTX 40 Series:** RTX 4060 up to 4090 >

> - **RTX 50 Series:** _Full day-one support for next-gen RTX 50 series architecture._ >

> > _(Note: We are actively optimizing for Apple Silicon M-Series and AMD GPUs in our upcoming product roadmap!)_

### **Translate Everything. Available Everywhere. Total Peace of Mind.**

Say goodbye to cloud subscriptions, buffering wheels, and privacy concerns. Experience true viewing freedom with NexSub today.

#### **purchase**

Its price is USD$9 one-time payment for lifetime of the product

#### Zero Subscription. Zero Hidden Fees.

[buy it with paypal, USD$9, one-time payment for lifetime of the product](./NexSub_buy.html)

#### **Download and Install**

[download it from majorgeeks](https://www.majorgeeks.com/files/details/nexsub.html)

[download it](https://bucket-steelsoft-1.oss-us-west-1.aliyuncs.com/NexSub.7z)

[Review by GAX Online](https://gaxonline.com/rankings/ai-media/nexsub-offline-ai-video-subtitle-transla/)

🏆 Ranked #3 of 85 Ai Media tools · 4★ (0 reviews)