LetHim Voice

Faster than a keyboard
More natural than typing

Save hours of typing every week. Think - speak - combine.

Broadly compatible with your apps and OS

A third of the time

Dictation on the left, keyboard on the right. We speak about 3× faster than we type.

New message
Inserted

To: team@company.com

Hi there, I'm sending over the materials for tomorrow's meeting.

0:03
By voice
New message
Done

To: team@company.com

Hi there, I'm sending over the materials for tomorrow's meeting.

0:09
By keyboard

How it works

No window switching, no copy-pasting. Three steps — and you're typing with your voice.

01

Hold the shortcut

Set your own global shortcut — just hold it.

02

Speak

The equalizer shows you it's listening. Just speak naturally.

03

Release

Let go and your text lands instantly, right where your cursor was.

Built for speed and productivity.

A powerful tool you don't see until you need it.

Appearance under control

Window appearance, shortcut, prompt, API — make the app your own.

Ready

Recording indicator

While you speak, an indicator with an equalizer pops up — and disappears once your text is inserted.

0.3–1.1 s

from speech to finished text — depending on length

Built for speed

The system is always ready in the background.

Quiet in the background

Lives in the tray icon — no windows, no visual noise. And it uses just ~90 MB of RAM.

The key is yours alone

You enter your own API key and it's stored only locally with you.

Works in every app

Browser Email Code editor Chat Documents Gaming

Your key - your control

Dictation runs on your own Groq API key — free and no strings attached. No credit card or phone number needed.

Set up in a minute

  1. 01
    Create a Groq API key — free, in a few seconds. Official link: console.groq.com/keys
  2. 02
    Paste it into the app's settings.
  3. 03
    Done... Now just dictate.
Your own key and full control
The app has no access to your data
The app runs no hidden processes
System prompts are configurable
Free

More than enough headroom

Even with heavy dictation. Two Groq models run under the hood:

whisper-large-v3 Transcription
8 h of audio per day · 2,000 dictations · 20/min
llama-3.3-70b-versatile Post processing
100,000 tokens per day · 1,000 runs · 30/min

On by default — for more accurate, higher-quality results.

Go over and there are no charges or commitments — the limit simply resets.

What's new and what's next...

The current version, fresh features and what's in the works right now.

CHANGELOG.md main
next coming soon
  • Planned macOS app
  • Planned One-click ready-made presets
  • Planned Voice-driven writing assistant
  • Planned Multi-language optimization
v1.1 current
  • Improved Improved speech-recognition quality
  • Improved Better compatibility with games & apps
  • New Optional post processing (Recommended)
  • New Configurable system prompts
v1.0 earlier
  • New Windows desktop app
  • New Push-to-talk dictation anywhere
  • New New design
  • New Your own Groq API key — local

Frequently Asked Questions

Which applications does it work with?

It works in every Windows application — browser, email, Slack, VS Code, Word, notes. Wherever you place the cursor, the text will appear there.

Which languages does it support?

Slovak, Ukrainian, and English — all processed with the same accuracy and natural quality. No compromises, no favorites.

Why do I need to create my own API key?

Because it is a very effective alternative to traditional STT solutions and LLM-based postprocessing. We also take into account that not every user has a powerful enough device to run large LLM models locally. Nevertheless, we are actively working on local processing and optimization for different types of devices. The current solution provides significantly higher quality and faster processing without unnecessarily using your device's resources. Modern LLM models for text processing are very powerful, and thanks to the optimized infrastructure on Groq servers, they can deliver fast and high-quality results.

Where is my API key stored?

Exclusively on your device. It never passes through our servers — we cannot see it and we never send it anywhere. Control remains entirely with you.

Do I need to switch between windows?

Not at all. The text is inserted exactly where your cursor was. If something goes wrong or you forget to select a field, the text remains in your clipboard — just press Ctrl+V.

Will it slow down my computer?

No. The application uses around 90 MB of RAM, which has no noticeable impact on performance or FPS. It runs quietly in the background and does not interfere with your work.

Is my voice recording private?

Yes. The recording goes directly from your device to the Groq API — we never see or store it. Your voice, your data.

Do I need an internet connection?

Yes. An internet connection is required for voice processing, but the application itself runs locally.

What is postprocessing?

After transcription, AI automatically corrects grammar, punctuation, and text structure, so the result sounds natural and clean without additional editing.

How do I get an API key?

Register for free on Groq, create an API key, and add it to the application. The entire process takes approximately 2 minutes.