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Callbook AI launch: what they're building and where to launch next

What they're building

AI collections agency for late stage portfolios

Batch
Y Combinator Summer 2026
Industry
B2B
Team size
7
Based
San Francisco, CA, USA; Remote

Founders

callbook.ai ↗

See their funding details ↗

Callbook AI on the record

What they shipped

  • From its YC profile: Callbook AI is a collections agency operated by AI. We collect late stage portfolios by finding, contacting and negotiating with borrowers. (source)
  • Its own site describes it as: "Callbook AI locates, contacts, and negotiates with borrowers across calls, SMS, and email, adapting every collection action to your strategy." (source)

Who is behind it

  • Diego Avellaneda, Founder/CEO: CEO at Callbook AI. Applied ML researcher with two peer-reviewed publications on deep learning and embedded systems (TinyML on-device deep learning for indoor tracking; low-cost embedded sensing, Elsevier). Master's in IoT applying TinyML to real-time truck telemetry 6+ years in embedded ML. Former Senior Software Engineer at CI&T, where he built Audi's e-commerce car-purchasing platform. Second-time founder (source)
  • Daniel Martinez, Founder & Product: CTO at Callbook AI. CPO at Treble (YC S19). Leading B2B products for 5+ years. (source)

Timeline

  1. 2025: founded, per its YC profile. (source)

Other B2B software launches on FoxPlug

Where else to launch Callbook AI

  • Product Hunt ↗
    Self-promotion allowedFree
  • Indie Hackers Forum ↗
    Self-promotion allowed
    Audience: IndieHackers; bootstrapped solo founders sharing revenue and behind-the-scenes
  • Hacker News (Show HN) ↗
    Self-promotion allowed, within the community's rules
    Audience: Hacker News readers; engineers, technical founders, infra-curious people
  • Demand Curve ↗
    Self-promotion allowed, within the community's rules
    Audience: Slack community; tight-knit, pseudo-private peer group
  • No Code Founders ↗
    Self-promotion allowed, within the community's rules
    Audience: Slack community; tight-knit, pseudo-private peer group
  • OnlineGeniuses ↗
    Self-promotion allowed, within the community's rules
    Audience: Slack community; tight-knit, pseudo-private peer group
  • Product Makers ↗
    Self-promotion allowed, within the community's rules
    Audience: Slack community; tight-knit, pseudo-private peer group
  • ProductLed ↗
    Self-promotion allowed, within the community's rules
    Audience: Slack community; tight-knit, pseudo-private peer group

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Featured on FoxPlug: Callbook AI