Vox Dictum, on-device transcription with speaker diarisation and AI summaries
Vox Dictum is a privacy-first transcription app for macOS that runs entirely on-device. It offers high-accuracy speech recognition in 60+ languages, automatic speaker diarisation, AI-powered summaries, audio enhancement, and flexible export options. All data stays on your Mac with zero data collection.
Vox Dictum — Private AI Transcription for macOS | Cobalt InFX
Cobalt InFX
Innovative Software Solutions
We build intelligent, privacy-first software for professionals who demand precision and control. Every product runs on-device — your data stays yours.
Vox Dictum
Private, on-device transcription for macOS. Import any recording, label speakers, and generate intelligent summaries — all processed locally on your Mac.
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100% on-device
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Apple Silicon
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Transcription in 60+ languages
Download on the Mac App Store
macOS 14.6+ · Apple Silicon (M1 or later)
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AI Transcription
Import audio or video. AI-powered speech recognition transcribes with high accuracy across 60+ languages. AI summaries available in English and major languages.
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Speaker Recognition
Automatically detect and label speakers. Rename a speaker once — all phrases in that file update. With Pro+, the same voice is recognised across multiple recordings.
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AI Powered Summary
Generate structured summaries tailored to meetings, interviews, podcasts, and more — with key decisions, action items, and speaker contributions. On-device AI — no cloud, no data sharing.
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Audio Enhancement
Built-in speech enhancement, background noise removal, and silence removal. Better input, better output.
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Flexible Export
Export as TXT, Markdown, HTML, or SRT subtitles — all with speaker names. Ready for your workflow.
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Complete Privacy
Zero data collection. Zero analytics. Zero cloud processing. Your recordings and transcripts never leave your Mac.
Vox Dictum MacWhisper Otter.ai Dragon
On-device processing ✓ ✓ ✗ ✓
Zero data collection ✓ ✓ ✗ ✗
AI Summary ✓ On-device ✗ Cloud ✗
Speaker recognition ✓ On-device ✗ Cloud ✓
Overlap detection ✓ ✗ ✗ ✗
Audio enhancement ✓ ✗ ✗ ✗
Free tier Unlimited ✗ 300 min/mo ✗
Price From £7.99/mo €59 one-time $16.99/mo $699
Pricing
Start free. Upgrade when you need more.
Free
£0
No credit card required
Unlimited transcriptions
Small and Base transcription models
Speaker diarisation and renaming
Transcription in 60+ languages
Audio enhancement suite
Export as TXT, MD, HTML, SRT
Audio Advisor
URL and podcast import
Popular
Pro
£7.99 /month
Everything in Free, plus:
Advanced transcription models
AI Powered Summary
Overlap resolution
Custom vocabulary corrections
Speaker reallocation
Transcript phrase splitting
Bulk transcript export
Pro+
£12.99 /month
Everything in Pro, plus:
Speaker recognition (voice matching)
Consistent labels across batch jobs
Auto-label propagation
Project-level speaker re-run
Annual: £99.99/year — save 36%
Privacy Policy
Your data stays on your device
🔒 Cobalt InFX products collect no data. Recordings, transcripts, and summaries are processed entirely on your device and are never transmitted to any server.
Vox Dictum — What we process
Vox Dictum processes audio and video recordings to produce text transcripts, speaker labels, and AI-generated summaries. All processing is performed locally on your Mac using on-device machine learning models. No audio, text, or metadata is sent to Cobalt InFX, Apple, or any third party during processing.
What we collect
Nothing. Vox Dictum does not collect personal data, usage analytics, crash reports, telemetry, or any other information from your device. The app contains no analytics frameworks, no tracking pixels, and no third-party SDKs that collect data.
Network activity
The only network activity in Vox Dictum is: (1) downloading AI models on first use (~2 GB, one-time), (2) downloading additional transcription models when you select a new model size, and (3) Apple verifying your subscription status. No recording data, transcript content, or user-generated content is transmitted over the network at any time.
Speaker recognition
Speaker voice matching (Pro+ tier) uses on-device neural network inference to compare voice characteristics within a single processing session. Voice embeddings are computed transiently in memory and discarded when the processing job completes. No biometric data is stored persistently. No voice profiles are created or retained between sessions.
Subscriptions
Subscriptions are managed entirely by Apple through the App Store. Cobalt InFX does not process payments, store credit card information, or have access to your Apple ID credentials.
Data storage
Your transcripts, speaker names, vocabulary corrections, and summaries are stored locally in your Mac's Application Support directory within the app's sandbox. This data is included in Time Machine backups and is deleted when you uninstall the app. Cobalt InFX has no access to this data.
Children's privacy
Cobalt InFX products are not directed at children under 13. We do not knowingly collect any information from children.
Changes to this policy
If we update this policy, we will post the revised version on this page with an updated effective date.
Effective date: April 2026
Contact: [email protected]
Support
Need help?
Before contacting us
Check the built-in Help section in Vox Dictum: Settings → Help. Most common questions are answered there.
Common topics
Model downloads require a stable internet connection (~2–7 GB depending on features used). Transcription with advanced models may take longer than the recording duration — this is normal for on-device processing.
Vox Dictum system requirements
macOS 14.6 (Sonoma) or later
Chip Apple Silicon (M1 or later)
RAM 8 GB minimum, 16 GB recommended
Storage ~4–7 GB for AI models (downloaded on first use)
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