# How Daily uses Cartesia

**500ms**: “Daily Bots delivers voice-to-voice latencies – including transport over the network – as fast as 500ms.”

As published on [cartesia.ai](https://www.cartesia.ai/customers/daily), September 2024. Captured by usedby on 2026-10-08.

- Company: [Daily](https://www.usedby.ai/companies/daily.md)
- Tool: [Cartesia](https://www.usedby.ai/tools/cartesia.md)
- Industry: [DevTools & Infrastructure](https://www.usedby.ai/companies/industry/devtools-infrastructure.md)

## What the story says

Daily uses Cartesia's Sonic text-to-speech model as the primary voice provider for Daily Bots, its open source cloud for building voice AI agents. Developers use it for voice interactions in applications such as customer support, appointment scheduling, and virtual personas.

Summary written by usedby from the source page, in English. The figures are those of Cartesia and Daily, not ours.

> Ultra-low Low Latency: Daily Bots delivers voice-to-voice latencies – including transport over the network – as fast as 500ms. This is human conversational speed. The speed of Cartesia Sonic is part of what makes this possible.

- **180 ms**: “Cartesia consistently achieves a time-to-first-byte for voice inference of 180 ms or better, including network overhead.”
- **13 languages**: “Daily facilitates natural and responsive voice interactions operating in 13 languages with support for customized voices.”

> Cartesia Sonic is the best voice model today for real-time multimodal use cases.
>
> Kwindla Hultman Kramer, Co-Founder and CEO, Daily

## What usedby checked

We compared the story with its live page on 2026-10-08.

- Checked: the figure 500ms is printed word for word on the page, near the name of Daily.
- Checked: the passage quoted above is copied word for word from the page, near the name of Daily.
- Checked: the publication date is read from the page’s own metadata, never guessed.
- Checked: Daily uses Cartesia. Confirmed line. Latest check across sources: 2026-10-08.
- Not checked: the result itself. We quote it; we did not measure it.

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Source: https://www.usedby.ai/case-studies/daily-cartesia · How we check: https://www.usedby.ai/methodology