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189 companies on usedby use at least one of the 5 tools in this category with a public customer. Recall leads with 50 companies. Then come Assembly AI (48) and Deepgram (45). 23 companies run two of these tools or more. The most common pair is Assembly AI with Recall (9 companies).Latest check Oct 8, 2026: 206 of 214 public lines checked. Counts are of companies on usedby, not of the whole market: we list a company when a public page shows its AI tools.
189
companies on usedby use a tool of this category
Companies per tool. A company using two tools counts for both.
Counts include job-post signals, drawn apart on each tool page.
Companies with a public line for each tool. Job-post signals count and are drawn apart in the proof bar.
| # | Tool | Customers | Proof |
|---|---|---|---|
| 1 |  Recall | 50 | |
| 2 |  Assembly AI | 48 | |
| 3 |  Deepgram | 45 | |
| 4 |  Cartesia | 39 | |
| 5 |  LiveKit | 32 |
23 companies run two of these tools or more. The most common pair is Assembly AI with Recall, at 9 companies.
Recall50 customersRecall is used by 50 companies on usedby, 32 confirmed by a case study, a named quote or a press release. Named customers include Hubspot, Instacart, and Calendly. Who uses Recall, Assembly AI vs Recall
Customer page: recall.ai. Latest check of 47 of 50 lines: Oct 2, 2026.
Assembly AI48 customersAssembly AI is used by 48 companies on usedby, 22 confirmed by a case study, a named quote or a press release. Named customers include Zoom, Apollo.io, and ClickUp. Who uses Assembly AI, Assembly AI vs Recall
Customer page: assemblyai.com. Latest check of 46 of 48 lines: Oct 2, 2026.
Deepgram45 customersDeepgram is used by 45 companies on usedby, 33 confirmed by a case study, a named quote or a press release. Named customers include NASA, IBM, and Cloudflare. Who uses Deepgram, Cartesia vs Deepgram
Customer page: deepgram.com. Latest check of 42 of 45 lines: Oct 2, 2026.
Cartesia39 customersCartesia is used by 39 companies on usedby, 36 confirmed by a case study, a named quote or a press release. Named customers include ServiceNow, Quora, and Zomato. Who uses Cartesia, Cartesia vs Deepgram
Customer page: cartesia.ai. Latest check of 39 of 39 lines: Oct 8, 2026.
Companies first listed by a tool of this category in the last 90 days.
Side-by-side pages with the companies behind each tool.
Answers drawn from usedby data.
Recall, used by 50 of the 189 companies on usedby in this category. Then come Assembly AI (48) and Deepgram (45). Who uses Recall.
Recall: 50 companies on usedby, against 48 for Assembly AI. 9 companies use both, counting confirmed and observed lines only.
Yes: 23 of the 189 companies on usedby in this category run two or more. The most common pair is Assembly AI with Recall (9 companies).
By the number of companies with a public line for each tool, read from dated captures of vendor customer pages, case studies, press releases and job posts. Job-post signals count in the totals and are shown apart. usedby lists a company when a public page shows it, so these counts describe the companies on usedby, not the whole market.