# Best AI voice design tools for Thai voices, saved voices, and voice agents

Which AI voice design tool fits a voice that speaks Thai, a voice saved and called by id, several takes at once, or a realtime voice agent, from each tool's own pages.

Published 2026-10-23. Paxa Labs.

A voice design tool makes a voice from a written description, with no recording. The tools differ in what languages a designed voice speaks, whether the voice is kept, how many takes come back, and where the voice can be used afterward.

Every tool fact below links that tool's own page, as we read it in October 2026. No tool is scored or ranked, and a tool appears under a job only where its own page states the fit.

## For a voice that speaks Thai

[Paxa's Voice design](https://paxalabs.com/voice-design) takes a description in English, Thai, or Chinese, and each voice speaks Thai, English, or Mandarin, the one its description names. [The guide to describing a voice](https://paxalabs.com/guides/how-to-describe-a-voice-for-ai) has Thai and Chinese examples.

[ElevenLabs' models page](https://elevenlabs.io/docs/overview/models) lists its eleven_ttv_v3 design model at more than 70 languages, linked to the Eleven v3 language list, which includes Thai. [Google's speech generation page](https://ai.google.dev/gemini-api/docs/speech-generation) lists Thai for Gemini 3.8 Flash TTS, a model its [voice design page](https://ai.google.dev/gemini-api/docs/voice-design) supports. [Inworld](https://docs.inworld.ai/tts/capabilities/multilingual) places Thai in its second language tier and recommends designing a voice in the target language, while [its voice design page](https://inworld.ai/voice-design) asks for descriptions written in English.

## For a voice you save and call by id

A saved Paxa voice gets an id that works in [the Speech tool](https://paxalabs.com/app/speech) and the API on Paxa TTS Flash v2. An account keeps 1 on the free plan and up to 50 on the largest, and [the designed voices docs](https://paxalabs.com/docs/designed-voices) cover the id.

[ElevenLabs](https://elevenlabs.io/docs/creative-platform/voices/voice-design) saves a design into a voice slot, and [its slot table](https://elevenlabs.io/docs/help-center/account/general/how-many-voice-slots-do-i-get-per-tier-and-how-can-i-increase-it) runs from 3 on the free plan through 10, 30, and 160 on Starter, Creator, and Pro. [Inworld](https://docs.inworld.ai/tts/voice-design) gives a published voice a permanent voiceId, and [its pricing](https://inworld.ai/pricing) lists 100 custom voice slots on demand. [Gemini](https://ai.google.dev/gemini-api/docs/voice-design) stores up to 200 voices per project, each for one year.

Two tools keep a design for less time. [MiniMax](https://platform.minimax.io/docs/api-reference/api-overview) deletes a designed voice that no speech request has used for seven days. [Fish Audio's design API](https://docs.fish.audio/features/voice-design) creates no saved voice and points to cloning for a voice that persists.

## For several takes from one description

[ElevenLabs](https://elevenlabs.io/docs/creative-platform/voices/voice-design) returns three options per generation, and [Inworld](https://docs.inworld.ai/tts/voice-design) up to three previews. [Fish Audio's API](https://docs.fish.audio/features/voice-design) returns one to four candidates, two by default, and [Hume's platform](https://dev.hume.ai/docs/voice/voice-design) generates three.

Paxa returns one voice per description and changes it in words: type warmer or slower, and hear the next version. [ElevenLabs Remix](https://elevenlabs.io/docs/overview/capabilities/voice-remixing) also changes a voice from a description of the change, as a separate feature.

## For a realtime voice agent

A saved Paxa voice speaks on [a live connection](https://paxalabs.com/docs/live-streaming), which takes text as it arrives and streams audio back. [OpenAI's prompt voices](https://developers.openai.com/api/docs/guides/custom-voices) work only with GPT-Live, up to 100 per organization. [Hume](https://dev.hume.ai/docs/voice/voice-design) makes a saved voice usable in its EVI voice interface as well as its TTS.

## For knowing what a design costs

Paxa charges 5 credits for each design or change, its first line included, and speech in a saved voice costs 1.25 times the rate of a catalog voice. [Inworld](https://inworld.ai/voice-design) bills designed voices at the same rate as its library voices. [Alibaba Cloud](https://www.alibabacloud.com/help/en/model-studio/qwen-tts-voice-design) makes creating a voice free and bills speech at the target model's rate, in the China (Beijing) region it lists.

ElevenLabs, Fish Audio, and MiniMax each price a design differently, per generation, per request, or per voice. [The design and cloning guide](https://paxalabs.com/guides/voice-design-vs-voice-cloning#cost) sets out all three.

## Before you build on one

[ElevenLabs' help center](https://elevenlabs.io/docs/help-center/product/voices/voice-design/what-is-voice-design) says its voice design is still experimental. [Hume's voice design](https://dev.hume.ai/docs/voice/voice-design) requires its Octave 1 model, which [its FAQ](https://dev.hume.ai/docs/text-to-speech-tts/faq) says supports English and Spanish only. A designed Paxa voice works with Paxa TTS Flash v2 and no other model.

## Common questions

### What is an AI voice design tool?

A tool that makes a voice from a written description of it, such as a calm narrator in her fifties, with no recording of a real person.

### Which voice design tools speak Thai?

Paxa designs voices that speak Thai, English, or Mandarin. ElevenLabs links its eleven_ttv_v3 design model to a language list that includes Thai, Google lists Thai for Gemini 3.8 Flash TTS, and Inworld places Thai in its second language tier.

### Can I use a designed voice through an API?

Yes, at Paxa, ElevenLabs, Inworld, and Gemini once the voice is saved. A saved Paxa voice works in the console and the API, on single requests and live connections, and the Paxa API also designs, saves, renames, and deletes voices.

### Is voice design free?

It depends on the tool. Alibaba Cloud makes voice creation free. A Paxa design costs 5 credits, and a new account's free credits cover several, with no card.