Callbook AI
YC S26 · Active · AI collections agency for late stage portfolios
Competitors
| Company | Category | Status | Program |
|---|---|---|---|
 Promoted.aiShared: late stageAcquiredAI | AI | Acquired | YCW21 |
 CollectWiseShared: collection agencyActiveAI | AI | Active | YCF24 |
Adjacent
| Company | Category | Status | Program |
|---|---|---|---|
 DebtStreamShared: collection agencyNot statedOther | Other | Not stated | Antler2023 |
 OncoboxShared: late stage, findingActiveOther | Other | Active | YCS17 |
 LEAH LabsShared: late stageActiveOther | Other | Active | YCW19 |
Also from S26 in AI
All of S26
Founders
- Diego AvellanedaFounder/CEO
- Daniel MartinezFounder & Product
About Callbook AI
Callbook AI is a collections agency operated by AI. We collect late stage portfolios by finding, contacting and negotiating with borrowers.
- YC batch
- S26 · Summer 2026
- Status, per YC
- Active
- Category
- AI
- Team size
- 7
- Location
- San Francisco, CA, USA; Remote
- Founded
- 2025
- Checked
- 34m ago
YC tags: AI
Callbook AI: questions
Which YC batch was Callbook AI in?
Callbook AI was in Y Combinator's Summer 2026 batch (S26).
Is Callbook AI still active?
Y Combinator lists Callbook AI as active.
Who founded Callbook AI?
Callbook AI's founders, as listed on its YC page: Diego Avellaneda (Founder/CEO), Daniel Martinez (Founder & Product).
Where is Callbook AI based?
Callbook AI lists San Francisco, CA, USA; Remote as its location on YC's directory.
Sources: each program's public company list, read twice a week. Not affiliated with Y Combinator or any other program. Logos via logo.dev; trademarks belong to their owners.