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Open-source Flutter package transcribes speech fully on-device with no server or API key

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A developer released transcribe_cpp, an MIT-licensed Flutter package for speech-to-text that runs entirely on iOS and Android phones. It requires no server, account, or API key, and it works in airplane mode, so user audio never leaves the device. The package uses voice detection to mark sentence boundaries and shows live text that settles without flickering as the user speaks. It wraps the transcribe.cpp engine, built on ggml, and runs NVIDIA's Parakeet 110M model, a roughly 90 MB download fetched on first use. The developer reports about 40 times real-time speed on a mid-range phone and says the hard work lay in the surrounding plumbing rather than the models themselves.

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