AssemblyAI vs Ultravox.ai
AssemblyAI vs Ultravox.ai, compared side by side on 15 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: AssemblyAI is on 50/100 and Ultravox.ai on 52/100.
Where each one leads
AssemblyAI
- agent readiness: 52/100 against 46/100
- domain rating: 78/100 against 51/100
- funding raised: $112M against $10.0M
Ultravox.ai
Leads on none of the measures we hold for both companies.
At a glance
| Measure | AssemblyAI | Ultravox.ai |
|---|---|---|
| What it is | AI models for speech-to-text, summarization, and understanding audio content. | Ultravox.ai (formerly Fixie.ai) is building human-like voice AI agents and models for natural, real-time communication. |
| Category | Voice AI, Speech Recognition, Speech-to-Text, Audio Intelligence | Agentic AI, AI Agents, Foundation Model, Large Language Model |
| Sells toBusiness model | B2B | B2B |
| Offering | Platform | Platform |
| Founded | 2017 | 2022 |
| Headquarters | San Francisco, United States | San Francisco, United States |
| Status | Active | Active |
Size, funding and growth
| Measure | AssemblyAI | Ultravox.ai |
|---|---|---|
| Employees | Not published | 16 |
| Total funding | $112M | $10.0M |
| Latest round | Not published | Seed |
| Valuation | $1 | Not published |
| LinkedIn followers | Not published | 5,687 |
StartupHub scores
Our own 0-100 ratings. They measure company strength and site quality, not which product suits you.
| Measure | AssemblyAI | Ultravox.ai |
|---|---|---|
| StartupHub scoreOur 0-100 rating | 50/100 | 52/100 |
| Traction | 40/100 | 47/100 |
| Team | Not published | 30/100 |
| Search visibility | 15/100 | 54/100 |
| Quality | 68/100 | 58/100 |
| Agent readinessHow well an AI agent can read and act on the site | D (52/100) | D (46/100) |
| Domain ratingLink authority, 0-100 | 78/100 | 51/100 |
Technology
Detected on each public site, so it reflects the marketing stack as well as the product.
| Measure | AssemblyAI | Ultravox.ai |
|---|---|---|
| Hosting | Vercel | Not detected |
| CDN | Vercel | Not detected |
| CMS | Not detected | Framer |
| Frameworks | Astro, Tailwind CSS | Not detected |
| Analytics | Not detected | Fathom |
| Open source | No | Yes |
Product and pricing
| Measure | AssemblyAI | Ultravox.ai |
|---|---|---|
| Key features | Not published | Human-like Voice AI, Ultravox v0.5 Model, Enhanced Transcription Accuracy, Expanded Language Support, Direct Speech Consumption, Real-time APIs & SDKs |
AssemblyAI vs Ultravox.ai: common questions
Which is better, AssemblyAI or Ultravox.ai?
On our 0-100 score Ultravox.ai rates higher (52/100 against 50/100). 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 15 data points above: read the rows that match what you are buying for.
How do AssemblyAI and Ultravox.ai compare on the numbers?
AssemblyAI leads on agent readiness (52/100 against 46/100), domain rating (78/100 against 51/100), funding raised ($112M against $10.0M).
Read the full AssemblyAI review and pricing or the Ultravox.ai review and pricing. You can also browse other AssemblyAI alternatives we track.