If you care about local privacy on your Mac, you know Superwhisper. It was the early pioneer of the "on-device Whisper" movement and built a loyal following among privacy-first developers, lawyers, and researchers.
Now there's LumeVoice. It matches Superwhisper's local privacy but adds zero-latency speed and Agentic Refinement. If you handle sensitive legal documents, patient notes, or proprietary code — which local-first tool should you run?
We ran both through our full benchmark protocol (see our 10,000-word AI dictation study) and used both as daily drivers for four weeks. Here's the honest verdict.
Head-to-Head Benchmark Results
| Metric | LumeVoice | Superwhisper |
|---|---|---|
| Avg. Latency | 310ms | 910ms |
| WER Standard English | 1.2% | 1.4% |
| WER Technical Jargon | 2.8% | 3.1% |
| WER Non-Native Accent | 4.1% | 5.2% |
| Peak RAM (Active) | 210 MB | 890 MB |
| Local Processing | ✅ Yes | ✅ Yes |
| AI Text Refinement | ✅ Yes | ❌ Raw transcription only |
| Price | Free / $7.99/mo / $99 Lifetime | ~$99 one-time |
1. Ease of Use & Configuration
A tool is useless if it's too annoying to set up.
- Superwhisper: Built for tinkerers. You can customize prompts, create multiple modes, and choose your exact Whisper model. The configurability is its selling point — and its learning curve. To get genuinely good results, you need to spend time building and maintaining your prompt library.
- LumeVoice: Built for instant execution. It's "batteries-included." The Agentic Refinement engine automatically detects your context — Slack vs. Notion vs. VS Code — and adapts the output format without any configuration. You install it and start talking.
Winner: LumeVoice (for most users), Superwhisper (for tinkerers who want granular control)
2. Speed & Latency — The "Instant" Test
Local processing hits your M-series chip hard. How each tool handles that determines whether dictation feels like an extension of your thoughts or a waiting game.
In our benchmark tests:
- Superwhisper: 910ms average latency — fast enough to be usable, but you'll notice a "thinking pause" after you finish a sentence before the text drops. Over a full workday, this adds up.
- LumeVoice: 310ms average latency — just over a quarter of a second. At this speed, text arrives before your conscious attention shifts back to the screen. It genuinely feels like typing.
The 3× latency gap is LumeVoice's biggest practical advantage in sustained daily use.
Winner: LumeVoice
3. Privacy — The "Offline" Test
Can you use it securely on a plane, in a hospital, or when reviewing privileged legal documents?
- Superwhisper: 100% local by default. No cloud dependency, no account required. Extremely stable offline.
- LumeVoice: 100% local Privacy Mode for Pro users. Both raw transcription and AI refinement run entirely on your Mac's Neural Engine. No data leaves the hardware.
The one nuance: LumeVoice's free tier uses cloud processing for AI refinement. If you're working with sensitive data, you need the Pro tier's local mode.
Winner: Tie (both are genuinely excellent for local privacy)
4. RAM — The "8GB Mac" Reality
This metric matters enormously if you're running an M1 or M2 MacBook Air with 8GB RAM.
- Superwhisper: 890 MB peak during active dictation sessions. On an 8GB Mac, that's 11% of your total system RAM — before Chrome, Slack, VS Code, and Notion start competing.
- LumeVoice: 210 MB peak. On the same 8GB machine, that's 2.6% of RAM — essentially invisible to system performance.
For MacBook Air users (the most common Mac), this is a decisive practical difference.
Winner: LumeVoice
5. Text Intelligence
What happens after your words are transcribed?
- Superwhisper: Delivers raw transcription. What you say is what you get. You can set up custom prompts to apply some formatting, but this requires deliberate configuration.
- LumeVoice: Applies Agentic Refinement automatically. It strips filler words ("um," "like," "you know"), fixes grammar on the fly, applies context-appropriate formatting, and adjusts tone based on where you're typing. A Slack message sounds like a Slack message. A Notion document looks like a document.
Winner: LumeVoice (for real-time writing), Tie (for raw transcription purity)
6. Pricing
- Superwhisper: Approximately $99 one-time. No free tier.
- LumeVoice: Free (2,000 words/month) | Pro ($7.99/month) | Lifetime ($99)
At the same Lifetime price point, LumeVoice adds AI refinement, lower RAM, and a free entry point for trying before committing.
Who Should NOT Choose Superwhisper
- You're on an 8GB Mac and need RAM headroom for other apps
- You want plug-and-play with zero configuration
- You want AI to intelligently clean up filler words and context-format your output
- You value ultra-low latency in sustained real-time dictation
Who Should NOT Choose LumeVoice
- You genuinely enjoy tinkering with custom prompt modes and Whisper model selection
- You primarily need to transcribe pre-recorded audio files (MacWhisper is better for that)
- You want raw, unmodified transcription without any AI refinement layer
The Verdict
Run Superwhisper if:
- You want to manually build and tweak your own AI prompts
- You just want basic transcription without smart rewriting
- You have a high-RAM Mac and want a mature, established local tool
Run LumeVoice if:
- You want zero-latency dictation that feels instant (3× faster than Superwhisper)
- You have an 8GB Mac and can't afford a 890 MB RAM process in the background
- You want Agentic Refinement to automatically clean up "umms" and context-format output
- You want a modern tool that works inside any app without configuration
Ready for Private AI Dictation?
Get LumeVoice Pro today and run local, zero-latency dictation on your Mac. 3× faster than Superwhisper. Same privacy guarantee. Lower RAM footprint.
For macOS 13+ (Apple Silicon recommended)