Confucius4-TTS vs Google Cloud Text-to-Speech
Confucius4-TTS
github.comGoogle Cloud Text-to-Speech
cloud.google.comSide by side
| Figure | Confucius4-TTS | Google Cloud Text-to-Speech |
|---|---|---|
| Price from | — | $4/mo |
| Free plan | — | — |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Linux | Yes | — |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 0 | 14 |
| Spec score · Text-to-speech tools | 7.9 (#119) | 9.2 (#8) |
| Spec score · Text-to-Speech Software | 7.9 (#119) | 9.0 (#13) |
| API access | Yes | Yes |
| Commercial use | Yes | Yes |
| Export formats | WAV,PCM | MP3,LINEAR16,OGG_OPUS,MULAW,ALAW |
| Integrations | The project acknowledges use of Qwen3-TTS, CosyVoice, Amphion/MaskGCT, w2v-BERT 2.0, Seed-VC, and BigVGAN components or methods. | GetApp lists integrations including Cloud Vision API, YouTube, Unity and Studio. |
| License | The repository includes an Apache License, Version 2.0. | The public Google API protocol definition is licensed under Apache License 2.0; the hosted synthesis service itself is proprietary. |
| Platforms | web,api,linux,self_hosted | web,api |
| Purpose | Confucius4-TTS is an LLM-based text-to-speech system for multilingual and cross-lingual speech synthesis that preserves speaker identity across languages. | The API converts text into natural-sounding speech and can accept text or SSML input to produce audio data. |
| Streaming | The project documents streaming generation that returns raw int16 little-endian PCM chunks and provides the sample rate in a response header. | The product supports streaming audio synthesis for low-latency, real-time conversations. |
| Voice cloning | It supports zero-shot voice cloning without requiring a reference transcript or additional training. | Yes |
Plans
Google Cloud Text-to-Speech
- Standard voices$4 a month
- WaveNet voices$4 a month
- Neural2 voices$16 a month
- Polyglot voices$16 a month
- Chirp 3: HD voices$30 a month
- Studio voices$160 a month
- Instant custom voice$60 a month
- Gemini 2.5 Flash TTS and Gemini 2.5 Flash-Lite Preview TTSPrice not published
- Gemini 3.1 Flash TTSPrice not published
- Gemini 2.5 Flash TTS / Gemini 2.5 Flash-Lite Preview TTSPrice not published
In their own words
Confucius4-TTS
Confucius4-TTS has no write-up on Specifiction yet; its figures are above.
Google Cloud Text-to-Speech
Google Cloud Text-to-Speech is an API that converts text or SSML into audio data for applications. It offers more than 380 voices across more than 75 languages and variants, with REST or gRPC integration and output formats including MP3, LINEAR16, OGG_OPUS, MULAW, and ALAW. Gemini-TTS supports single- or multispeaker speech guided by natural-language prompts for style, accent, pace, tone, and emotional expression. Chirp 3 instant custom voice can create a personalized voice model from as little as 10 seconds of audio and is available in more than 30 locales. Streaming synthesis supports real-time conversations, while long-audio synthesis accepts up to 1 million bytes of input. Speech controls include pitch, speaking rate, and volume gain. Billing counts input characters, including spaces, newlines, and SSML tags except the mark tag, and billing must be enabled. Standard and WaveNet voices cost US$4 per 1 million characters, with 0 to 4 million characters free. Other voice models have different rates and free-use limits. New customers can receive $300 in Google Cloud credits.