
SmartSub
本地优先的一站式桌面字幕工具,内置 6 种 ASR 引擎与全平台 GPU 加速及 17+ 翻译服务商,覆盖音视频转写、翻译、校对、字幕烧录封装全流程,跨 Windows/macOS/Linux 运行
The Lens
SmartSub takes audio or video and produces translated subtitles, start to finish, on your own machine. It transcribes speech to text, translates it, lets you proofread against a video preview, then burns the subtitles into the video or muxes them as a soft track. Nothing gets uploaded, which matters if you're working with footage you can't send to a cloud service. MIT-licensed and free on Windows, macOS, and Linux.
It ships six transcription engines, including whisper.cpp and faster-whisper that run fully offline, and hooks into 17+ translation providers from Google and Baidu to Gemini, DeepSeek, and any OpenAI-style API. GPU acceleration covers NVIDIA CUDA, AMD and Intel via Vulkan, and Apple Metal, with automatic detection and CPU fallback. Setup is heavier than a pure web tool: you download models, pick an engine, and configure providers, but it's a desktop install, not a server.
Solo creators and translators: this is a strong free alternative to paid subtitle services, and the local engines cost nothing to run. Small teams doing video work: same, with no per-seat fee. Large teams: workable, though there's no central account or shared workflow.
The catch: "free" stops at the app boundary. The bundled offline engines are free, but the moment you wire up Gemini, DeepSeek, or a cloud translation API for better quality, you're paying those vendors per use on your own keys. Stick to whisper.cpp and faster-whisper and it's genuinely free end to end.
Free vs Self-Hosted vs Paid
fully freeFree
The entire desktop app. MIT-licensed, runs on Windows, macOS, and Linux. Transcription with six ASR engines, translation through 17+ providers, AI subtitle proofreading, and video synthesis (burned-in or soft-muxed subtitles). All processing is local, no upload.
Self-hosted
The app runs entirely on your own machine. The built-in whisper.cpp and faster-whisper engines run fully offline at no cost.
Paid
The app is free. Some translation providers it connects to (Gemini, DeepSeek, cloud APIs) and some ASR models charge by usage, but those are your accounts, not SmartSub's. Local engines cost nothing.
Free MIT app, though some optional cloud translation and ASR providers bill you directly.
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License: MIT License
Use freely, including commercial. Just keep the license.
Commercial use: ✓ Yes
About
- Owner
- Lin Xiaodong (User)
- Stars
- 4,089
- Forks
- 281