Callbook AI YC Application

Summer 2026Active

San Francisco

Callbook AI went through Y Combinator in the Summer 2026 batch as a B2B company. Below: what the company does, who founded it, and its application to YC, reconstructed question by question in the real YC form.

YC batch: Summer 2026
Industry: B2B
Location: San Francisco
Team size: 7
Status: Active
Launched: 2026

Founders

Diego AvellanedaFounder/CEO
Daniel MartinezFounder & Product

What Callbook AI does

Callbook AI is a collections agency operated by AI. We collect late stage portfolios by finding, contacting and negotiating with borrowers.

Callbook AI's YC application, reconstructed

Y Combinator application

Callbook AI, Summer 2026 batch. The real form questions, answered from public data.

Founders2
Company7
Progress7
Idea4
Equity3
Curious2
Batch Preference1

Company

Company name

Callbook AI

Describe what your company does in 50 characters or less.

AI collections agency for late stage portfolios

What is your company going to make? Please describe your product and what it does or will do.

We built Callbook AI as a collections agency run by AI. Our product finds, contacts, and negotiates with borrowers in late stage portfolios. The whole process is automated, so funds and creditors can maximize recoveries without manual collections workflows.

Where do you live now, and where would the company be based after YC?

We are based in San Francisco, CA and remote. After YC, we will continue operating from San Francisco and remotely.

Explain your decision regarding location.

San Francisco is the best place for AI and fintech talent, and our remote setup gives us access to a wider pool.

21 more answers in the full application

Founders, Progress, Idea, Equity, Curious, Batch Preference are in the full version. Create a free account to open it in YC Insights, next to every other YC batch.

See full application

Frequently Asked Questions

Is this the real Callbook AI YC application?

No. Y Combinator keeps submitted applications private. This is a reconstruction: the real YC form questions, answered from Callbook AI's public data (launch notes, founder backgrounds, product description). It shows how a company like Callbook AI would present itself to YC, not the text they submitted.