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, which takes a different approach: cloud processing with zero data retention, plus Agentic Refinement that cleans up the transcript for you. If you handle sensitive legal documents, patient notes, or proprietary code — which one 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 | 3-Day Trial / $14.99/mo / $249 Lifetime | $249.99 one-time |
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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: Cloud processing with zero data retention — audio is never stored and never used for training, and your dictation history stays on your device. Audio is transmitted for processing, so this is a retention guarantee rather than a no-transmission one.
The key distinction: LumeVoice processes in the cloud and does not offer an on-device mode. It retains nothing and never trains on your data, but audio is transmitted — so for work that cannot leave the machine, Superwhisper is the correct choice.
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: $249.99 one-time (or $84.99/year).
- LumeVoice: Pro Monthly ($14.99/month) | Pro Annual ($6.66/month with 3-day free trial) | Lifetime ($249)
While both have comparable lifetime entry points, LumeVoice adds advanced AI refinement, lower RAM, and a 3-day free trial to evaluate Pro features.
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 for fast, low-latency dictation on your Mac — with zero data retention and a much lighter RAM footprint than running local models.
For macOS 13+ (Apple Silicon recommended)
