PrompterPro

PrompterPro is a Windows-first, installable teleprompter MVP. It records raw camera and microphone media while an on-screen script follows the speaker. If the speaker leaves the script, the prompt pauses; when matching speech is heard again, it resumes. The prompt overlay is never burned into the recording, but subtitles can be.

View on Microsoft Store

MVP features

• Create, edit, duplicate, search, and delete scripts stored on this device.
• Generate a first draft from a topic, audience, tone, duration, and key points.
• Preview camera and microphone before recording.
• Record raw video at the camera's highest available resolution, with resolution-aware bitrate, and audio through the browser's MediaRecorder.
• Follow spoken words with local, streaming sherpa-onnx recognition.
• Pause prompt movement when speech leaves the script without pausing recording.
• Choose current-word, current-line, or highlight-free prompt scrolling.
• Place the prompt eye-line in the upper, middle, or lower part of the preview.
• Review and export either a clean take or an H.264/AAC MP4 with a polished single-line lower third that highlights each spoken word in a chosen font.
• Install the app as a PWA or packaged Microsoft Store desktop app on Windows.

Run locally

Requirements: Node.js 22.12+ and current Microsoft Edge or Google Chrome.

npm.cmd install
npm.cmd run speech:model
npm.cmd run dev

Open http://localhost:5173. Allow camera and microphone access when prompted. The one-time model command downloads the 122 MB English Zipformer model into the ignored .models directory. Recognition then runs without internet access. The local API reads the optional OPENAI_API_KEY from .env.local.

For a production-like local run:

npm.cmd run build
npm.cmd start

Then open http://localhost:8787.

For the packaged desktop app:

npm.cmd run desktop

To create an unsigned x64/ARM64 MSIX bundle on Windows:

npm.cmd run package:windows
npm.cmd run speech:smoke:arm64

See the Microsoft Store release guide for Partner Center identity settings, automated releases, listing copy and submission checks.

Validation

npm.cmd test
npm.cmd run typecheck
npm.cmd run speech:smoke
npm.cmd run build
npm.cmd run build:desktop

The speech smoke test uses the downloaded model and its bundled reference audio to exercise the same loopback WebSocket used by Studio.

Browser support

The complete MVP is targeted at the packaged Windows desktop app and current Edge or Chrome on Windows. The app records native MP4 when available; otherwise the local API converts the browser's WebM take to MP4 with its bundled FFmpeg binary. Optional highlighted subtitles are rendered by that same local binary. Speech-following streams PCM only to the PrompterPro API at 127.0.0.1, where sherpa-onnx performs recognition. If the local model is not installed, recording still works and the prompt can be moved with the on-screen controls or arrow keys.

Set SHERPA_ONNX_MODEL_DIR to use the same model from another location, or SHERPA_ONNX_THREADS to choose 1–4 CPU inference threads.

Product documentation

• Product and UX
• Architecture
• Delivery plan and roadmap
• Microsoft Store release guide and listing
• Privacy policy

Privacy

Scripts are stored locally in browser storage. Camera and microphone media stay on this computer. Microphone samples and transcripts used for prompt following travel only over the loopback interface to the local sherpa-onnx engine. A take may pass through the same local API for MP4 conversion or subtitle rendering and is removed from its temporary folder after export. Only the optional AI generation form is sent to OpenAI; camera, microphone, recordings, transcripts, and the script library are not.