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Voice selection in Thoughtly happens inside the Agent Builder. When you open an agent and click the Voice field in the right-hand sidebar, the Voice Selector panel opens with two tabs: Saved (shown by default) and Explore. This gives you everything you need to browse, preview, save, and assign voices without leaving the builder.

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Voice Platforms

Voices are sourced from two industry-leading providers:

Cartesia

Ultra-low-latency voice synthesis with expressive, professional voices. Features real-time generation, speed control, and advanced audio capabilities.

ElevenLabs

Natural-sounding voices with a wide selection of accents, styles, and personalities. A trusted choice for conversational AI.

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Saved Tab

Your personal voice library. Voices you have previously saved appear here, grouped by language. The active voice’s language group is pinned to the top, and the active voice itself is highlighted within it.
Most workspaces connect their own voice provider account to access voices. See Bring Your Own Key (BYOK) for details on connecting your API key. A small number of enterprise workspaces use Thoughtly’s built-in voice set instead and see 13 default English voices labeled Built-in.

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Explore Tab

The Explore tab inside the Agent Builder’s Voice Selector gives you access to thousands of professional voices from Cartesia and ElevenLabs. The Expressive toggle is enabled by default, prioritizing low-latency, expressive voices. Toggle it off to browse the full catalog across both platforms. You can search, filter, preview, and save, all without leaving the agent you’re editing.
Explore tab showing filter chips and voice search results grouped by language

Explore tab with filter chips and voice results

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Filter Chips

Filters can be combined. For example, enable Expressive + Female + Spanish to find low-latency female voices in Spanish.

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Text Search

Click the search icon (🔍) in the panel header to open a search bar. Type a voice name or keyword and results update automatically as you type. When no results match, a Clear filters link appears. Clicking it resets the Gender filter, Language filter, and search text. The Expressive toggle is separate and must be toggled off manually if you want to broaden results further.

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Previewing Voices

Every voice row shows a Play button on hover. Click it to hear a sample. Click again (or click Pause) to stop. Only one preview plays at a time. Starting a new preview automatically stops the previous one.
Voice row with Play and Bookmark action buttons visible on hover

Hover a voice row to reveal the Play and Bookmark actions

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Saving and Assigning a Voice

There are two ways to use a voice from Explore: Click to Save + Assign (Recommended) Click anywhere on a voice row. Thoughtly will:
  1. Save the voice to your workspace library (if not already saved)
  2. Assign it to the current agent
  3. Close the Voice Selector and return you to the agent sidebar
This is the fastest path. One click does everything. Bookmark for Later If you want to save a voice without assigning it right now, click the Bookmark icon on hover. The voice appears in your Saved tab for future use across any agent. To remove a bookmarked voice, click the filled Bookmark icon to unsave it from your library.
Voice availability depends on the vendor and can occasionally change. If a voice you rely on becomes unavailable, contact our support team and we will help you find a replacement.

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Pagination

Results load 50 voices at a time. If more are available, a Load more voices button appears at the bottom. Click it to fetch the next page. Loading state is shown while fetching.

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Voice library behavior

The voice selector loads voices in pages. If more voices are available, use Load more voices to continue browsing. Voices should appear only once even when loading additional pages.

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ElevenLabs and Cartesia availability

Workspace voice availability can depend on your plan and whether Bring Your Own Key is enabled. If your workspace uses ElevenLabs BYOK, connect and test your ElevenLabs key before expecting ElevenLabs voices to appear in the selector.