Online or offline · No API keys · Runs locally

Script in.
Studio-grade audio out.

Konvertex is a neural voice studio that turns any script into high-quality narration. Use Microsoft Neural voices online, or stay fully offline with Kokoro — runs on your laptop, no signups, no quota games.

Built with Kaptain, for CHYNJ. Konvertex is a working product Kaptain built end to end — shown here as proof of what it can ship. Not downloadable yet: it is being prepared as a free, open release.

Voices & engines Microsoft Neural (online) Kokoro TTS (offline) Linux macOS (Apple Silicon + Intel) Windows 10 / 11
// CORE FEATURES

High-quality narration
without the API gauntlet.

Most TTS tools either lock you behind a paid API or ship low-quality voices. Konvertex gives you both — premium neural voices online and capable offline voices when you don't want to be online at all.

01 · Online

Microsoft Neural voices

Hundreds of high-quality neural voices across dozens of languages. No Azure account, no API keys — Konvertex handles the request.

02 · Offline

Kokoro TTS — fully local

Stay fully offline with the Kokoro neural TTS model running locally. Great voice quality, zero network, zero privacy concerns.

03 · Workflow

Paste a script. Hit generate.

No fiddly setup. Drop your script into the editor, choose a voice, click generate. Audio file appears.

04 · Install

One-zip launch

Download the zip for your OS, unzip, launch. No Python install, no dependency hell. Browser UI opens automatically.

// THE FLOW

Three steps.
One audio file.

Konvertex is built for people who want narration done, not a digital audio workstation. Open, paste, generate. Output to MP3 or WAV. Use it anywhere.

  • Pace, pitch, and voice selection in one panel
  • MP3 or WAV output
  • Browser UI at localhost:8004
  • Same workflow on Linux, macOS, Windows
konvertex · studio
"Welcome to the future of self-hosted voice synthesis. Konvertex puts a studio in your laptop — no accounts, no API keys, no quota."
VOICE
Aria — Neural en-US · online
Kokoro — Heart en-US · offline
// BUILT WITH KAPTAIN

This app is the demo.

Built end to end with Kaptain, for CHYNJ. Free open release in preparation.

// GitHub repo — at release  ·  // README — at release

// Want the tool that built it? Kaptain is the product →

// WHAT HAPPENS NEXT

Free, and open.

Production-cleaned, source public, standing on its own. Download and repository links land here.

Built with Kaptain.

The tool that built it is available today.

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