Kowairo Voice
On-Device Japanese TTS
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- You can now choose the voice model quality
- Long-form batch generation is smoother
- Refreshed the first-time guide
Everything still runs entirely on your device.
The developer, TAKAYOSHI YOSHIKAWA, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- TAKAYOSHI YOSHIKAWA
- Size
- 36.2 MB
- Category
- Utilities
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Takayoshi Yoshikawa
