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2 / 4 Tools
| Attribute | Cartesia by Cartesia AI | Kokoro TTS by Hexgrad |
|---|---|---|
| Category | Developer Tools | Audio Subcategory: Text-to-Speech & Voice Models |
| Rating & Reviews | ★New / 5.0 0 verified reviews Weighted score: 0.00 | ★New / 5.0 0 verified reviews Weighted score: 0.00 |
| Pricing Model | freemium | open_source |
| Starting Price | Free tier Free trial tier; Usage pricing per audio character with volume enterprise discounts. | 0 Open weights under Apache-2.0. Free to download and self-host. Third-party cloud API hosting typically costs under $1 per million input characters. |
| Platforms | APIWebSocket | PyTorchONNXHugging Face TransformersSelf-Hosted APIDocker |
| AI Capabilities | Sub-100ms Time-to-First-ByteState-Space Model ArchitectureDynamic Emotion ControlsStreaming Voice Telephony | Text-to-speechMultilingual voice synthesisEdge & CPU inferenceOpen-weight deployment |
| Overview | Sonic voice engine delivering expressive conversational speech with sub-100ms time-to-first-byte. | Lightweight, open-weight 82-million parameter text-to-speech model supporting 54 voices across 9 language variants. |
| Tags | voicettslow-latencyvoice-agents | ttstext-to-speechvoice-aiopen-weightsaudio |
