Gradium: 提供超低延迟的语音对话 API 与语音克隆功能，非常适合实时对话代理管线。 Gradium 记录了 126,416 月访问量，月度环比增长为 +128.7%，定价为免费增值，定价请咨询。Vapi 记录了 662,301 月访问量，增长率为 -11.4%，定价为免费增值。
| 维度 / 指标 |  | |
|---|---|---|
| 官方域名 | gradium.ai | vapi.ai |
| 定价模式 | 免费增值，定价请咨询 | 免费增值 |
| 月访问量 | 12.64万 (126,416) | 66.23万 (662,301) |
| 月度环比流量变化 | +7.12万 (+128.7%) | -8.55万 (-11.4%) |
| 主要市场与份额 | 🇫🇷 法国 (26.5%) | 🇺🇸 美国 (44%) |
| 直接访问 / 月 | 2.72万 | 37.73万 |
| 用户评分 | 4.5 | 4.5 |
| 支持的平台 | 网站 | 网站 |
首音频低至 50 毫秒的实时语音 AI 接口
文本转语音、语音转文本与实时语音到语音翻译首音频约 50 毫秒，专为对话式智能体而优化，而非批处理场景。
可用短样本快速克隆音色，也可选择生产级专业克隆，或仅凭文字描述生成全新声音。
WebSocket 流式传输、Python 与 Rust SDK、自定义词表、语义化 VAD 和语码切换，让智能体开发者易于集成。
Phonon 是 Gradium 开放可用的 TTS 模型，可端侧运行，适用于离线或隐私敏感部署。
通过 API 构建、测试并部署生产级语音 AI 智能体
通过一个 API 配置语音识别、大模型推理层和语音合成，无需分别对接多家供应商。
平台处理实时音频流、打断处理和通话状态，让对话自然且响应迅速。
可申请 Vapi 号码，也可接入 Twilio、Vonage 或 Telnyx，同一智能体支持呼入与呼出。
上线前模拟通话，上线后跟踪每次通话的转写、效果指标与合规信号。
专项更强Provides raw frontier language models and real-time multimodal capabilities, requiring custom scaffolding compared to Vapi's voice workflows.
专项更强Offers developer access to Gemini's powerful multimodal APIs, but lacks out-of-the-box telephony voice agent pipelines.
专项更强Offers developer access to Gemini's powerful multimodal APIs, but lacks out-of-the-box telephony voice agent pipelines.
专项更强Provides enterprise-grade speech-to-text and audio intelligence APIs, but lacks turnkey conversational voice agent telephony orchestration.
专项更强Provides enterprise-grade speech-to-text and audio intelligence APIs, but lacks turnkey conversational voice agent telephony orchestration.
Noiz AI is a voice AI platform that turns text into lifelike speech, clones voices from short samples, and lets you design new voices by describing the tone and emotion you want. It supports emotional text-to-speech, multilingual dubbing and translation for video, a browsable voice library, and developer-ready APIs for building speech into your own products.
Noiz AI is a voice AI platform that turns text into lifelike speech, clones voices from short samples, and lets you design new voices by describing the tone and emotion you want. It supports emotional text-to-speech, multilingual dubbing and translation for video, a browsable voice library, and developer-ready APIs for building speech into your own products.
Soniox is a speech AI platform offering real-time speech-to-text, expressive text-to-speech with voice cloning, and real-time speech translation in 60+ languages through one unified API, built for voice agents, wearables, dictation, and live captions.
Enterprise voice AI platform specializing in high-volume outbound and inbound phone calls with robust telephony integrations.
