Retell AI vs Ultravox.ai
Retell AI vs Ultravox.ai, compared side by side on 22 data points: what each one does, how big it is, what it has raised, the tech running each site, and what users report. We score both out of 100 on traction, team and visibility: Retell AI is on 63/100 and Ultravox.ai on 52/100.
Where each one leads
Retell AI
- our overall score: 63/100 against 52/100
- agent readiness: 61/100 against 46/100
- domain rating: 76/100 against 51/100
- headcount: 35 against 16
- funding raised: $14.0M against $10.0M
- LinkedIn following: 20,979 against 5,687
Ultravox.ai
Leads on none of the measures we hold for both companies.
At a glance
| Measure | Retell AI | Ultravox.ai |
|---|---|---|
| What it is | Voice AI agent platform handling more calls per second than the US 911 system, $60M ARR with a 35-person team. | Ultravox.ai (formerly Fixie.ai) is building human-like voice AI agents and models for natural, real-time communication. |
| Category | Agentic AI, AI Agents, AI Voice Synthesis, AI Voice Cloning | Agentic AI, AI Agents, Foundation Model, Large Language Model |
| Sells toBusiness model | B2B | B2B |
| Offering | Platform | Platform |
| Founded | 2023 | 2022 |
| Headquarters | San Francisco, United States | San Francisco, United States |
| Status | Active | Active |
Size, funding and growth
| Measure | Retell AI | Ultravox.ai |
|---|---|---|
| Employees | 35 | 16 |
| Total funding | $14.0M | $10.0M |
| Latest round | Seed | Seed |
| LinkedIn followers | 20,979 | 5,687 |
StartupHub scores
Our own 0-100 ratings. They measure company strength and site quality, not which product suits you.
| Measure | Retell AI | Ultravox.ai |
|---|---|---|
| StartupHub scoreOur 0-100 rating | 63/100 | 52/100 |
| Traction | 66/100 | 47/100 |
| Team | 60/100 | 30/100 |
| Community | 8/100 | Not published |
| Search visibility | 48/100 | 54/100 |
| Quality | 68/100 | 58/100 |
| Agent readinessHow well an AI agent can read and act on the site | C (61/100) | D (46/100) |
| Domain ratingLink authority, 0-100 | 76/100 | 51/100 |
Technology
Detected on each public site, so it reflects the marketing stack as well as the product.
| Measure | Retell AI | Ultravox.ai |
|---|---|---|
| CDN | Cloudflare | Not detected |
| CMS | Webflow | Framer |
| Analytics | Google Analytics 4, Google Tag Manager, Mixpanel, Linkedin Insight +1 more | Fathom |
| Support stack | Discourse | Not detected |
| Open source | No | Yes |
Product and pricing
| Measure | Retell AI | Ultravox.ai |
|---|---|---|
| Key features | AI Voice Agent Platform, Auto-Sync Knowledge Base, Powerful Call Transfer, Easy Appointment Booking, IVR Navigation & Batch Calling, Compliance & Scalability | Human-like Voice AI, Ultravox v0.5 Model, Enhanced Transcription Accuracy, Expanded Language Support, Direct Speech Consumption, Real-time APIs & SDKs |
Retell AI vs Ultravox.ai: common questions
Which is better, Retell AI or Ultravox.ai?
On our 0-100 score Retell AI rates higher (63/100 against 52/100). The score weights traction, team, visibility and profile completeness, so it reflects company strength rather than which product suits you. We compare the two on 22 data points above: read the rows that match what you are buying for.
How do Retell AI and Ultravox.ai compare on the numbers?
Retell AI leads on our overall score (63/100 against 52/100), agent readiness (61/100 against 46/100), domain rating (76/100 against 51/100), headcount (35 against 16), funding raised ($14.0M against $10.0M), LinkedIn following (20,979 against 5,687).
Read the full Retell AI review and pricing or the Ultravox.ai review and pricing. You can also browse other Retell AI alternatives we track.