Chatterbox TTS vs iSpeech
Chatterbox TTS
github.comiSpeech
ispeech.orgSide by side
| Figure | Chatterbox TTS | iSpeech |
|---|---|---|
| Price from | Free | $0.25/mo |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | Yes | Yes |
| Web | — | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 2 | 15 |
| Spec score · Text-to-Speech Software | 9.0 (#9) | 9.2 (#6) |
| Spec score · Text-to-speech tools | 8.9 (#21) | 9.2 (#11) |
| Commercial use | Yes | Yes |
| Export formats | WAV | aiff,mp3,ogg,wma,flac,wav,alaw,ulaw,vox,mp4 |
| Free plan | Yes | Yes |
| Languages | The README lists 23 supported languages for Chatterbox Multilingual. | The homepage says the Speech API supports text-to-speech and speech recognition in more than 30 languages. |
| Platforms | linux,macos,self_hosted | web,ios,android,api |
| Product | Chatterbox is a family of open-source text-to-speech models by Resemble AI. | iSpeech provides text-to-speech and automated speech recognition services through APIs, SDKs, and online tools. |
| Support | The README invites users to join the project’s Discord community. | The developer pricing page lists priority technical support with purchases; the API guide directs support requests to [email protected]. |
| System requirement | NVIDIA’s Chatterbox plugin documentation specifies Windows 10 or 11 64-bit, 16 GB RAM and an NVIDIA GPU with compute capability 7.0 or newer for that integration. | The API requires an internet connection and follows standard HTTP behavior. |
| What it does | Chatterbox is Resemble AI’s open-source family of text-to-speech and voice-cloning models. | iSpeech provides cloud text-to-speech and automated speech-recognition services that turn text into audio or submitted audio into transcriptions. |
Plans
Chatterbox TTS
- Chatterbox open-source modelsFree
- Voice AI Research (Chatterbox)Free
iSpeech
- Plus$2.95 a month
- Premium$3.95 a month
- Pay Per Use$50 a month
- Pay Per Install$0.25 a month
- BasicFree
- HackerFree
- Plus$2.95 a month
- Premium$3.95 a month
- Junior$29 a month
- Pay-per-use 2,000 credits$50, paid once
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.
iSpeech
iSpeech provides text-to-speech and automated speech recognition through APIs, SDKs, and online tools. Its speech API can synthesize audio with multiple voices, formats, bitrates, frequencies, and playback speeds, and supports MathML and SSML. The API can also transcribe submitted audio across multiple languages and recognition models; iSpeech says custom models can be created. The homepage lists support for more than 30 languages. Audio downloads are available in AIFF, MP3, OGG, WMA, FLAC, WAV, A-law, μ-law, VOX, and MP4 formats. Listed access includes Android, iOS, Linux, macOS, web, Windows, API, and extension. The Basic plan is free for personal use, and commercial use is listed as available. Plus costs $2.95 a month, billed monthly, and includes 30-minute recordings, approximately 4,167 words. Premium costs $3.95 a month, billed monthly, with 12-hour recordings, approximately 100,000 words. Pay Per Use costs $50 a month for dynamic TTS usage only and includes 2,000 credits. Pay Per Install costs $0.25 a month and has a 10,000-install minimum.