Technology - Voice Type macOS dictation engine Skip to main content Voice Type Pricing Learn Enterprise Trust Blog Engineering How Voice Type stays fast and accurate Voice Type runs the entire dictation pipeline on your Mac. Here is how the audio processing, batching, and Core ML acceleration work together. On-device pipeline Robust voice activity detection: RNNoise-based VAD continuously tracks speech and suppresses background noise. Segmentation tuned for conversation: Phrase boundaries with padding and merging preserve context between utterances. Audio conditioning: We normalise to −14 LUFS with K-weighting, then apply a 50 Hz second-order Butterworth high-pass filter. Band-limited resampling: 48 kHz audio is converted to 16 kHz to match Whisper-derived model expectations. Context-preserving batching: Dictation streams in ~30 second blocks so longer thoughts stay coherent. Core ML + Metal acceleration: Optimised operators keep inference responsive while remaining energy-efficient. Why it feels faster No uploads: Audio never leaves your Mac, eliminating network latency and compression artefacts. Quick finalisation: When you release the hotkey, the current batch finalises within 2–3 seconds on an M-series Mac. Energy-aware scheduling: On-device inference avoids long-running cloud calls, keeping laptops cooler and quieter. Why it stays accurate Signal-first improvements: We reinforce audio quality before recognition instead of post-processing transcripts with heavy prompt engineering. Noise resilience: RNNoise lowers ambient distractions without over-smoothing consonants and sibilants. Domain vocabulary: Custom word lists feed directly into the recogniser, keeping technical jargon intact. Privacy and reviews Mac App Store distribution: Voice Type ships with Apple notarisation and sandboxing enabled. Authentic transparency: App Store reviews are shown without filtering, including critical feedback. Minimal network calls: We only ping Apple for receipt checks and, if you enable it, your optional rewrite provider. Optional instant rewrite Enable bring-your-own-key rewriting to hand transcripts to a rapid LLM for formatting, summary, or drafting. Because dictation stays local, you maintain full control over routing and retention. Voice Type Learn All guides Voice Type vs Apple Dictation Dragon alternatives For writers For developers Notion on Mac Latency demo Press kit Company Enterprise Trust Center Pricing Blog Company Terms of service Privacy policy Contact us © 2025 Careless Whisper Inc.