CloneTTS

Project Overview

CloneTTS is an offline, native Text-to-Speech (TTS) engine for Android devices. It allows you to clone desired voices and use them directly to read books or long texts on your phone — no internet connection required. All inference runs locally on-device.

Key Features

• Offline voice cloning: Record 1~3 seconds of speech to create a custom voice
• NPU hardware acceleration (New in 0.7.0): On supported Qualcomm Snapdragon flagship devices (8 Gen 2 / 8 Gen 3 / 8 Elite / 8 Elite Gen 5), offload synthesis to the on-device NPU for ~2× speed and significantly lower heat
• Enhanced sentence splitting (New in 0.7.0): Punctuation-graded pauses, dialogue quotes no longer split apart, mixed Chinese-English long phrases no longer chopped
• System TTS: Registers as an Android system TTS engine, compatible with Legado, Moon+ Reader, etc.
• HTTP API server: Built-in local HTTP server supporting GET and POST requests
• Speed & volume control: 0.5x–2.0x speech rate, 0%–200% volume
• Pronunciation correction: Add powerful custom plain text or regex-based substitution rules
• Voice backup: ZIP-based export/import with append or overwrite modes

Target Audience

• Android users
• Users who need offline reading/listening and voice cloning
• Users of Legado and other reading apps

Quick Start

1. Download the latest .apk from the Releases page
2. Install on your Android device (allow installation from unknown sources if prompted)
3. On first launch, the app extracts AI model data in the background — wait a few seconds
4. Run the built-in performance benchmark after installation
5. Change battery optimization to "Unrestricted" or "Allow background activity" in system settings

Core Advantages

• Fully offline operation, no internet required
• 1~3 second ultra-fast voice cloning
• NPU hardware acceleration (supported Qualcomm flagship devices)
• Usable globally as a system TTS engine, compatible with Legado and other apps
• Built-in HTTP API server

System Requirements

• OS: Android
• Architecture: ARM64

Notes

• Battery optimization must be set to "Unrestricted" or "Allow background activity" before use
• Lock the app in recent tasks to prevent it from being cleared by the system
• NPU acceleration only supports certain Qualcomm Snapdragon flagship devices