Kowairo Voice
On-Device Japanese TTS
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Free
About
Kowairo Voice is a completely offline Japanese text-to-speech app powered by Irodori-TTS v3. It runs entirely on-device — no internet connection required after the initial model download.
FULLY OFFLINE & PRIVATE
All processing happens on your device. Your text and generated audio never leave your phone. No data collection, no accounts needed.
VOICE DESIGN
Describe the voice you want in natural language — "calm female voice, cheerful" or "energetic young male voice" — and the AI generates speech matching your description.
VOICE CLONING (DUAL MODE)
Upload a reference audio recording to clone the voice. Combine with text descriptions for even more control.
ORGANIZED LIBRARY
Browse your generated clips by date, search by text content, and mark favorites for quick access.
PLAYLISTS
Group your audio clips into playlists. Play them in order, shuffled, or on repeat.
POWERED BY IRODORI-TTS V3
Built on the latest Irodori-TTS v3 (VoiceDesign) model, fine-tuned for high-quality Japanese speech synthesis with expressive control.
Perfect for content creators, language learners, accessibility needs, and anyone who wants to generate natural Japanese speech on their own terms.
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What's New in Kowairo Voice
1.1
July 8, 2026
Added long-form batch generation. Paste a long script and the app automatically splits it into well-sized blocks and synthesizes them together. With voice cloning, the tone stays consistent across chapters. - New long-form batch generation mode - Splits naturally at sentence boundaries ("。", line breaks, etc.) - Optimized block length so long texts stay smooth - Faster generation to cut waiting time on long texts - Smoother tap-to-edit for blocks, with fine volume / L-R balance control Still fully offline. Your text and audio never leave the device.
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