Whisperstream is a private, on-device dictation tool for Windows that transcribes speech locally using the NVIDIA Parakeet model without sending audio to the cloud. It supports push-to-talk or toggle hands-free input and types transcribed text directly into any active application, including Outlook, VS Code, and browsers. Users can configure custom vocabularies, per-app AI prompt modes, and AI-powered filler-word cleanup that also runs locally. The software supports 39 languages, works fully offline after setup, and is available for a one-time purchase of $29 covering up to two PCs.