CASE STUDY
Increase in lead-to-meeting conversions
▲ 37%
Win rate in head-to-head evaluations
Engineering hours per deployment
▼ 80%
When 11x first entered the voice AI market, no mainstream platforms existed, so they built their own. That quickly became unsustainable and led to lost deals, declining customer satisfaction and long deployment times of ~6 weeks per customer.
Their main challenges were:
Expensive and time-consuming R&D processes
4 full-time engineers were dedicated to the expensive guesswork of maintaining and fine-tuning their models
Struggling with performance and quality of interactions
Issues with latency, intelligence and voice realism
Hard to keep pace with market innovation
Their tech stack became outdated within 3 weeks and they were falling behind competition
About 11x
San Fransisco, Ca
11x is a YC-backed AI sales automation startup that builds AI agents for email and voice outreach. They run Julian, their voice agent focused on inbound lead qualification and consented outbound calling, on Ultravox.
"We were burning engineering weeks trying to keep our own voice stack alive. After testing more than twenty vendors we plugged Ultravox in and it was insane—basically zero latency and our quality score nearly doubled. We haven't lost a deal since switching."
-Keith Fearon, Head of Product & Growth at 11x
Why Ultravox?
After evaluating 20+ competitors, other platforms forced 11x to make tradeoffs across latency, intelligence or voice realism. With Ultravox, they got everything they needed in a much more cost-efficient way.
Human-like conversation flow and near-zero latency
Architecture and integrated tech stack delivers higher quality at much lower cost
Speed of iteration and responsiveness of the team
Julian works 24/7 to engage prospects and scale outreach while maintaining genuine connection with buyers at every touchpoint.
Solution
11x uses Ultravox to power "Julian," their AI voice agent that autonomously handles inbound and outbound calls 24/7, speaks over 30 languages, tailors conversations to each customer's brand, and executes follow-ups like updating CRM or scheduling meetings.
Impact and Results
Since switching to Ultravox, 11x has been able to accelerate revenue, dominate competitive deals, and significantly improve operational efficiency.
Revenue Acceleration
37% increase in lead-to-meeting conversions for their own sales and marketing efforts. Near-instant callbacks convert more inbound leads and directly expand top-line bookings without requiring additional marketing spend.
The voice product has become their fastest-growing offering. "It's our fastest growing product by far," Keith noted.
Improved Competitive Win-Rates
100% win rate in head-to-head evaluations since switching to Ultravox.
“Our blind human panel score went from about 2.3 to nearly 4 out of 5. We haven’t lost a deal since. Prospects don't even ask to see the product interface—they buy based on conversation quality alone.”
Increased Operational Efficiency and Speed
66% lower infrastructure costs
80% fewer engineering hours per deployment
Customer deployment time was cut from 6 weeks to 2 weeks
Unlocking Innovation and Better Customer experiences
Close partnership on multilingual models is unlocking new geographies and TAM expansion
Build and test your agents all you want on the Ultravox console. Deploy quickly and start using realtime voice.
