2
AI tools in use at Retell
Retell uses 2 AI tools: Cartesia and Assembly AI (Speech & Audio API). 1 is confirmed by a published story, quote or press release; 1 is listed on the vendor's own pages.Latest check Oct 8, 2026: 2 of 2 tools checked, from 4 public sources.
- Website
- retell.info
- AI tools in use
- 2
- Latest check
- October 8, 20262 of 2 tools checked so far
Every AI tool at Retell
2 lines, each linked to the public page behind it. Open a row to see the dated capture.
| Tool | Team | First public proof | Proof | Source |
|---|---|---|---|---|
 Cartesia | Speech & Audio API | — | cartesia.ai | |
 Assembly AI | Speech & Audio API | — | assemblyai.com |
“First public proof” is the earliest public page we have dated: a mention (“on or before”), a job post or a start the source states. Our capture dates are not adoption dates.
In Retell's own words
Published results, each linked to its dated source. We quote, we do not score.
It’s incredibly difficult to achieve the rare blend of latency, reliability, accuracy, and voice quality. Cartesia managed to do all four, which is why customers adopted them faster than any other voice model we’ve introduced.Questions about AI at Retell
What AI tools does Retell use?
Retell uses 2 AI tools: Cartesia and Assembly AI. 1 is confirmed by a published story, quote or press release, and 1 is listed on the vendor's own pages.
How does usedby know which AI tools Retell uses?
Each tool is linked to a public page that names Retell: a vendor's customer page, a published case study, a press release or a job post. We save each page with a dated capture and check it again on each run. A tool leaves the list only after three checks in a row that no longer find Retell, and at least 14 days after it was last seen. A tool with a published case study or quote is never removed automatically.