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CosmoWhisper
Summary
Windows professionals have been stuck choosing between Mac-only voice dictation tools and browser-wrapped stopgaps that stall behind corporate firewalls and eat RAM — CosmoWhisper is a native Windows app built to close that gap.
Built in C#/.NET with the Windows App SDK, it idles under 90MB RAM and delivers sub-500ms transcription across Slack, Word, Outlook, Notion, and VS Code without an Electron runtime weighing it down. The local offline mode — called Race Mode — runs a Whisper server entirely on-device, so audio never leaves the machine, which is the architecture medical and legal teams need for HIPAA compliance. Smart Commands let you highlight text and say 'Fix grammar' or 'Summarize' for inline edits. The free tier caps at 60 minutes per month, which is enough for evaluation but not for a full workday. Teams that need cross-platform coverage — a Windows desk paired with a MacBook — hit a hard wall immediately, as the vendor states Windows 10/11 is the only supported OS.
Bottom line: A well-engineered pick for Windows-only shops where a medical transcriptionist or developer needs offline, HIPAA-ready dictation — but if even one person on your team works on a Mac, you are buying two tools.
Pricing Plans
Subscription- Price
- $12 / mo
- Free Tier
- 60 minutes per month
Free
60 minutes per month
- Limited transcription time
Paid
Full access
- Unlimited transcription
- HIPAA-ready tier
- Local offline mode
View full pricing on cosmowhisper.com →
Pricing may have changed since last verified. Check the official site for current plans.
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Pros
Sign in to edit- Native C#/.NET build idles under 90MB RAM with no Electron runtime, so it does not compete with your IDE or browser for memory during a long coding session.
- Race Mode runs a full Whisper server locally with zero cloud exposure, which means a medical transcriptionist can chart in an EHR system offline without PHI ever touching an external server.
- HIPAA-ready architecture with Zero Data Retention and memory purge on exit, so legal and medical teams skip the compliance review that cloud-only tools require — that review is a paid-only feature.
- Smart Commands let you highlight existing text and speak edit instructions inline, so you avoid tab-switching to a separate AI editor mid-document.
- VPN and corporate firewall detection with a Force Cloud Proxy fallback, so it does not silently fail when an IT-managed network blocks standard traffic.
Cons
Sign in to edit- Windows 10/11 is the only supported OS — no Mac, no Linux, no mobile. A team where even one member works on a macOS laptop cannot standardize on this tool and will run CosmoWhisper alongside Superwhisper or a browser-based alternative, which defeats the workflow consistency argument entirely.
- No API is documented or listed anywhere on the vendor page. Teams that want to embed transcription into their own application — a custom EHR module, a developer tool, a Slack bot — cannot use CosmoWhisper programmatically and will need a separate transcription service like Deepgram or AssemblyAI for that layer.
- The free tier caps at 60 minutes of transcription per month. A professional who dictates for more than a couple of hours per week hits that ceiling within days and must move to the paid tier or stop mid-workflow — there is no grace buffer described on the vendor page.
- HIPAA-ready mode is a paid-only feature. A solo medical practitioner evaluating the tool on the free tier is testing a configuration that does not reflect the compliance posture they actually need, which means the evaluation period can produce a false signal about regulatory fit.
About
- Platforms
- Windows 10, Windows 11
- API Available
- No
- Self-Hosted
- Yes
- Last Updated
- 2026-09-09T07:27:00.430Z
Best For
Who it's for
- Windows professionals and developers
- Medical and legal users needing HIPAA compliance
- Users requiring fully offline transcription
What it does well
- Dictating into VS Code for code and documentation
- Medical charting in EHR systems with pharmacology terms
- Drafting legal contracts and briefs offline
- Writing technical reports in Notion or Word
Integrations
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Sign Up to ContributeFrequently Asked Questions
- Is CosmoWhisper free?
- CosmoWhisper has a permanent free tier alongside paid upgrades (paid plans from $12 / mo). You can keep using a baseline version indefinitely without paying.
- Is CosmoWhisper open source?
- No — CosmoWhisper is a closed-source tool. Source code is not publicly available.
- Can I self-host CosmoWhisper?
- Yes. CosmoWhisper supports self-hosting on your own infrastructure.
- What platforms does CosmoWhisper support?
- CosmoWhisper is available on: Windows 10, Windows 11.
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The Windows dictation gap
Windows professionals have been stuck choosing between Mac-only voice dictation tools and browser-wrapped stopgaps that stall behind corporate firewalls and eat RAM. CosmoWhisper is a native Windows app built to close that gap.
Core features
Built in C#/.NET with the Windows App SDK, it idles under 90MB RAM and delivers sub-500ms transcription across Slack, Word, Outlook, Notion, and VS Code without an Electron runtime. The local offline mode, called Race Mode, runs a Whisper server entirely on-device so audio never leaves the machine. This architecture supports HIPAA compliance for medical and legal teams. Smart Commands let you highlight text and say ‘Fix grammar’ or ‘Summarize’ for inline edits. The free tier caps at 60 minutes per month.
Pricing and limits
Subscription pricing starts at $12 per month. Self-hosted option is available.
Who it is for / who should skip it
Best for Windows professionals and developers, medical and legal users needing HIPAA compliance, and anyone requiring fully offline transcription. Skip it if you need Mac, Linux, or mobile support, or if you require a documented API for custom integrations.