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This AI Startup Is Taking Over Phone Sales

In this episode of Founder Firesides, YC Managing Partner Jared Friedman talks to the founders of Simple AI (S24), Catheryn Li & Zach Kamran, who just raised a seed round of $14M. Simple AI gives businesses an AI sales agent that handles inbound calls end-to-end and outperforms their human reps. Apply to Y Combinator: https://www.ycombinator.com/apply Work at a startup: https://www.ycombinator.com/jobs

Jared FriedmanhostZach KamranguestCatheryn Liguest
Feb 17, 202637mWatch on YouTube ↗

At a glance

WHAT IT’S REALLY ABOUT

Simple AI builds voice agents that sell and outperform call centers.

  1. Simple AI started as a consumer “better Siri,” then pivoted to an outbound calling assistant, and ultimately became an inbound AI sales agent after businesses asked to use the voice technology.
  2. Omaha Steaks became a flagship customer because its seasonal call-volume spikes create a hiring and training bottleneck that directly causes lost revenue.
  3. The product integrates deeply with legacy business systems to identify callers, answer detailed product questions, apply promotions, take payment/shipping info, and place orders without human intervention.
  4. Simple AI claims its agent is ~30% better at upselling than trained human reps due to consistent “best agent” performance and rapid A/B testing of sales scripts, voices, and accents.
  5. Defensibility comes from production-grade reliability work (latency, turn-taking, transcription edge cases, guardrails), plus per-customer fine-tuning and complex integrations that go far beyond a weekend demo.

IDEAS WORTH REMEMBERING

5 ideas

“Hair-on-fire” revenue problems create fast adoption for AI agents.

Omaha Steaks’ need to 15x staffing for holidays makes missed calls and untrained temps a direct revenue leak; an always-available agent that can close orders immediately is compelling even compared to other voice tools.

Viral consumer products can be a distribution channel into enterprise.

The founders’ consumer calling app generated inbound business demand when executives experienced the realism firsthand—Omaha’s CEO even discovered it via a prank call.

AI sales value is framed as revenue lift, not cost cutting.

Simple AI emphasizes increasing conversion/upsells (e.g., “revenue up 20%”) so customers care less about per-minute cost and more about quality, speed, and results.

Consistency beats average human performance in call centers.

By training on top reps and deploying that behavior everywhere, the system removes the variability of “superstars vs. clock-in/clock-out agents,” improving upsell rates across all calls.

Rapid experimentation changes how sales scripts are developed.

With prompt/script tweaks and A/B tests, teams can iterate instantly instead of waiting weeks for training to propagate—e.g., the surprisingly effective line “Lock in your savings today and save 10%.”},{

WORDS WORTH SAVING

5 quotes

“We’re building AI voice that sells.”

— Catheryn Li

“If you call the number on their website, it will go to Simple AI.”

— Catheryn Li

“Our AI is 30% better at upselling than trained live reps.”

— Catheryn Li

“Lock in your savings today and save 10%.”

— Zach Kamran

“You could build a demo in a weekend… but to actually put the thing into production…”

— Jared Friedman

Pivot journey (consumer to B2B inbound sales)Omaha Steaks case study and seasonal scalingDeep integration with legacy/on-prem systems (AS/400)Upsell optimization and A/B testing scriptsPersonalization (voice, accent, customer history)Latency targets and real-time constraintsReliability/guardrails and per-customer model tuning

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