outbound-calls
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AI Rudder
AI Rudder is a Singapore-based voice AI company that automates high-volume customer phone calls and chats for banks, lenders, insurers, e-commerce and logistics firms. Its human-sounding voice agents handle payment reminders, verification, surveys, telemarketing and customer service across 15+ languages and regional accents, letting enterprises scale contact-center work without adding headcount. Backed by Sequoia, Tiger Global and Coatue, it serves 500+ enterprise clients concentrated in Southeast Asia and Latin America.
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.
Standard Practice
Standard Practice builds voice AI for healthcare revenue cycle teams. Its AI agents place outbound phone calls to insurance payors and pharmacies - dialing, navigating IVR menus, waiting on hold, and speaking in a human-sounding voice - to handle claim follow-ups, benefits verification, prior authorizations, and EDI enrollment. The goal is to strip the phone-tag drudgery out of medical billing so practices get paid more, faster, while staff focus on higher-value work. Founded by Steven Greene and Phil Markunas after pivoting from their earlier venture Nibble Health, the New York company targets the roughly $1 trillion in annual U.S. healthcare administrative costs.