Fundraising Fox

Letterbook

YC S23

San Francisco, US · Founded 2023 · 2 employees · 1 known investors

Letterbook is an AI-native customer support platform that integrates with email inboxes, databases, and payment systems to help teams manage and resolve support tickets. It provides omnichannel ticket management, automated triage, and AI-assisted resolution for teams scaling fast.

Also known as Martin · Usher

AI & Machine LearningEnterprise SoftwareSaaSCustomer ServiceCustomer SupportAIUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (S23)

Letterbook was founded in 2023 by Dawson Chen and Ethan Hou.

DCDawson Chen
Dawson Chenin𝕏Co-founder & CEODawson Chen dropped out of Yale and now leads Letterbook as CEO.
EHEthan Hou
Ethan HouinFounderFounder of Letterbook, an AI-native customer support platform that integrates with email, databases, and payment systems to help teams manage and resolve support tickets.

Investors · 1

Y CombinatorSan Francisco · $500K

Images

Letterbook photoLetterbook photo

In the news

Letterbook - AI Customer Support Built for Startupsycombinator.com · Apr 2026These Yale and Berkeley dropouts just raised $2 million to build an AI assistant that could rival OpenAI | VentureBeatventurebeat.com · Jan 2025😺 Bye, Siri | Product Huntproducthunt.com · Mar 2024🤵‍♂️ Martin - Your personal voice AIycombinator.com · Oct 2023

Frequently asked questions

What does Letterbook do?
Letterbook is an AI-native customer support platform that integrates with email inboxes, databases, and payment systems to help teams manage and resolve support tickets. It provides omnichannel ticket management, automated triage, and AI-assisted resolution for teams scaling fast.
Who founded Letterbook?
Letterbook was founded by Dawson Chen, Ethan Hou in 2023.
Who are Letterbook's investors?
Letterbook's investors include Y Combinator.
Where is Letterbook headquartered?
Letterbook is headquartered in San Francisco, US.