lead-qualification
(2)
Callbook AI
Callbook AI is a Y Combinator (S26) startup building AI voice agents that make and take business phone calls in English, Spanish, and Portuguese. Founded by Colombians Diego Avellaneda and Daniel Martinez, it began as a plug-and-play AI phone system for Zoho CRM and has sharpened its focus on automated debt collections and portfolio management across Latin America, handling calls, WhatsApp, SMS, and email from a single platform.
Simple AI
Simple AI is a San Francisco startup building enterprise-ready voice AI agents that handle inbound and outbound B2C phone calls. Its agents answer questions, personalize offers, qualify leads, and close and upsell transactions over the phone - the company says they convert and upsell up to 30% more than trained human reps. Founded in 2024 by former Y Combinator software leads Catheryn Li and Zach Kamran, Simple AI runs on a proprietary voice stack with sub-850ms end-to-end latency and raised $14M in seed funding in February 2026.