Chatterbox TTS vs eSpeak NG
Chatterbox TTS
github.com
eSpeak NG
github.comSide by side
| Figure | Chatterbox TTS | eSpeak NG |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 2 | 2 |
| Spec score · Text-to-Speech Software | 9.0 (#9) | 8.9 (#16) |
| Spec score · Text-to-speech tools | 8.9 (#21) | 8.7 (#37) |
| Commercial use | Yes | Yes |
| Export formats | WAV | WAV |
| Founded | 2019 | 2015 |
| Free plan | Yes | Yes |
| Integration | NVIDIA provides a Chatterbox TTS plugin for ACE for Games with CUDA, Vulkan and Windows D3D12 backends. | It is available as a command-line program, a shared library, and a Windows SAPI5 version for compatible screen readers and other programs. |
| License | The code and model listing identify the project as MIT licensed, permitting modification and redistribution subject to the license notice. | The main eSpeak NG engine is released under the GNU GPL version 3 or later. |
| Platforms | linux,macos,self_hosted | The project lists Linux, BSD, Android 4.0+, Windows 8+, and Mac as supported platforms. |
| Self-hosting | Chatterbox is run locally and does not require an account when installed from the open-source project, according to an independent technical guide. | The project publishes source code and build instructions, allowing local compilation and installation. |
| What it does | Chatterbox is Resemble AI’s open-source family of text-to-speech and voice-cloning models. | eSpeak NG is a compact text-to-speech synthesizer supporting more than 100 languages and accents. |
Plans
Chatterbox TTS
- Chatterbox open-source modelsFree
- Voice AI Research (Chatterbox)Free
In their own words
Chatterbox TTS
Chatterbox TTS is a family of open-source text-to-speech models from Resemble AI. Its listed choices include Turbo, Nano, Multilingual V3, and dedicated single-language models. Turbo supports tags that can prompt reactions such as sighs, gasps, coughs, and laughter; Nano is intended for on-device or CPU use when memory and latency budgets are tight. The README lists 23 languages for Multilingual. The project supports voice cloning, audio input, batch processing, voice isolation, and WAV export. Generated audio carries Resemble AI’s PerTh watermark. The repository is MIT licensed, and its listed plan costs nothing for research and development. Resemble says it has stopped offering voice generation as a commercial product, while its models remain open and free for research and development. The README provides pip and source installation instructions and describes Python 3.11 on Debian 11, with CUDA, CPU, and MPS device options. Listed platforms are Linux, macOS, and self-hosted.