Speak your language.
They hear theirs.

Hailsi is a real-time voice translation overlay for your computer. Talk naturally in your own language while your conversation partner hears you in theirs — across any app, with privacy by default.

Built for

  • International couples and families
  • Remote workers on global teams
  • Gamers playing across borders
  • Language learners building real fluency

How it works

  1. 1

    You speak — or play audio in another language.

    Microphone, system audio, a video playing on your screen — Hailsi can listen to either source. Pick what makes sense for the conversation.

  2. 2

    Hailsi transcribes, locally.

    Your audio runs through speech recognition on your own computer. No upload, no cloud trip — your words stay where you said them.

  3. 3

    Translation runs locally too.

    The transcribed text is translated by a language model that lives on your computer. Roughly 1.6 to 3 seconds end-to-end on a modern CPU.

  4. 4

    You read what they said. They read what you mean.

    The other side appears in your overlay; your reply gets translated back the same way. Type, copy, or have the result spoken aloud — your call.

Works across any app — calls, games, meetings, browsers. No integrations, no plugins, no setup on the other person's end.

Questions

What languages does Hailsi support?

v1 launches with a wide set of languages — not just one pair. Hailsi uses a hub model, so any supported language can translate to any other, and every pair is tested before it ships. We're prioritizing the most-requested languages, so tell us which you'd use most when you sign up.

What does it cost?

The FREE tier is the real product — full real-time voice translation, running entirely on your computer, free and genuinely useful on its own, not a crippled demo. Premium launches right alongside it for people who want more: the advanced workspace, premium voices for more languages, and extra pro features. Simple pricing, and no surprise charges.

Does it work offline?

Yes. The FREE tier runs everything locally — speech recognition and translation happen on your computer. You'll need internet once, for the initial model download on first launch; after that, no connection required.

What about my privacy?

On the FREE tier, no audio leaves your device. Speech recognition and translation run locally. We don't transcribe your conversations on a server, train models on your audio, or sell your data. Any future feature that uses the cloud would be clearly labeled and strictly opt-in.

What hardware do I need?

Windows 10 or 11 to start. A modern CPU — anything from the last 5-6 years should be fine. About 1GB of disk space plus models. No GPU required for the FREE tier; if you have one, Premium’s GPU-accelerated path runs even faster.

How is this different from Google Translate or DeepL?

Those are great for typed text or one-shot translations. Hailsi is built for live conversations across any app — you don't paste text into a website. The overlay translates what's happening in real time, whether you're on Discord, in a game, on a Zoom call, or watching a video.

Will it work in Discord, Zoom, or Teams?

Yes. Hailsi is an overlay that captures audio independent of the app you're in. It listens to your microphone or your system's audio output, translates, and shows the result. The other person doesn't need Hailsi installed.

What if it makes a mistake?

It will, sometimes — voice translation isn't perfect, especially with names, slang, or technical jargon. Each translation shows the original transcript so you can catch when something feels off. We'd rather show you the seams than pretend they aren't there.

What does "Hailsi" mean?

From Estonian: hääl (voice) + sild (bridge). A voice-bridge between languages. Pronounced roughly "HAIL-see."

Why Windows only at launch?

It's where the developer works daily, so it's where the build can be tested reliably. macOS and Linux are on the roadmap; multi-platform is a real goal, not a placeholder. If you'd run this on Mac or Linux, mention it on the waitlist signup.

When can I try it?

Hailsi is in active development, with launch targeted for later this summer. Drop your email on the waitlist and you’ll be among the first invited as we open the doors — early signups go first.