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

NexSub, a fully offline AI video subtitle translator using local Whisper models, launches to provide real-time multilingual subtitles without internet access. The tool captures system audio to generate subtitles for any video source, ensuring privacy by processing all data locally on the user's machine.

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