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AI collections agency for late-stage portfolios
HQ: San Francisco, CA, United States | Founded: 2025 | Employees: 7 | Stage: Seed (Y Combinator S26) | Website: https://callbook.ai
Callbook AI is a debt collection agency run by AI. It collects on late-stage portfolios by locating borrowers, contacting them and negotiating repayment. The company's stated method is to research and understand each borrower's situation in depth before negotiating, which it says makes it consistently beat competing collections services. Reported results include negotiating with more than 100,000 people every week, delivering its best recorded recovery at every company it has worked with, and winning 100% of head-to-head pilots against competing services. Founded in 2025 and based in San Francisco with 7 employees. Chief executive Diego Avellaneda is an applied machine learning researcher with two peer-reviewed papers on deep learning and embedded systems — on-device indoor tracking, and l
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