Retell AI vs Sierra: Revenue, Funding & Team Size Compared
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Retell AI generates $40M in revenue; Sierra generates $200M. Sierra is 5× bigger than Retell AI by revenue. The table below compares Retell AI and Sierra on funding, valuation, customers, team size and headquarters — every figure GetLatka has verified for each company.
| Company |  Retell AIThis company |  Sierra |
|---|---|---|
| Revenue | $40M | $200M |
| Valuation | $108M | $15.8B |
| Funding raised | Not disclosed | $1.6B |
| Team size | 41 | 700 |
| Growth | 1.2K% | 100% |
| Founded | 2023 | 2023 |
| HQ | San Francisco, United States | San Francisco, United States |
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Retell AI at a glance
Retell AI generates $40M in revenue with 41 employees, headquartered in San Francisco, United States.
- Revenue
- $40M
- Valuation
- $108M
- Team size
- 41
- Founded
- 2023
Supercharge Your Contact Center Operations with AI Phone Agents
Sierra at a glance
Sierra generates $200M in revenue with 700 employees, headquartered in San Francisco, United States.
- Revenue
- $200M
- Valuation
- $15.8B
- Funding
- $1.6B
- Team size
- 700
- Founded
- 2023
Sierra is the conversational AI platform for businesses. We help companies elevate their customer experience with AI.
Other Retell AI alternatives
Retell AI competes with more than the companies on this page. Browse the full alternative lists to compare revenue, funding and team size across the category.
Retell AI vs Sierra: frequently asked questions
Is Retell AI or Sierra bigger?
Sierra is the bigger company by revenue, at $200M against $40M for Retell AI.
How much revenue does Retell AI make?
Retell AI generates $40M in annual revenue with a team of 41.
How much revenue does Sierra make?
Sierra generates $200M in annual revenue with a team of 700.
How much funding has Sierra raised?
Sierra has raised $1.6B in total funding since it was founded in 2023.