whisper.cpp
Runs AI speech recognition models locally for transcription and audio tasks.
The go-to free, local engine for running Whisper transcription anywhere; superb for private, offline speech-to-text, but a developer tool.
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A free, MIT-licensed C/C++ port of OpenAI's Whisper speech-recognition model that runs transcription locally and efficiently - even CPU-only, on phones, Raspberry Pis or laptops.
It made local Whisper genuinely practical: no Python or PyTorch, minimal dependencies, runs on CPU with heavy optimization (Apple Silicon, NVIDIA/AMD GPUs and more), so audio never leaves your device and there are no per-minute fees. The trade-offs are that it is a developer library (you build/integrate it) and accuracy/speed still depend on the model size and your hardware.
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Alternatives
A hosted ASR API (OpenAI Whisper API, Deepgram, AssemblyAI) for no-setup, scalable transcription.
faster-whisper - a Python-friendly, fast Whisper implementation if you prefer Python.
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