Fundraising Fox
/Companies
Sign in

Letterbook

YC S23

San Francisco, US · Founded 2023 · 2 employees · 7 known investors

Find your way into Letterbook

Sign up to see every warm intro you have to Letterbook

  • Paths you didn't know you had: your email and LinkedIn already hold routes to the Letterbook team. We find them for you
  • 2nd- and 3rd-degree connections: the friend-of-a-friend routes that take hours to manually find through your inbox or LinkedIn
  • Answers now, not in days: momentum is everything in a raise. Skip asking around whether someone knows someone

Days of research, done the moment you sign in, with every route ranked by how warm it is.

Sign up with GoogleAlready have an account? Log in

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 DCWU, Inc. · Martin · Usher · Usher, Martin

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 ChenCo-founder & CEODawson Chen dropped out of Yale and now leads Letterbook as CEO.
EHEthan Hou
Ethan HouFounderFounder of Letterbook, an AI-native customer support platform that integrates with email, databases, and payment systems to help teams manage and resolve support tickets.
HD
Harsh Deep
AD
Arjun Dixit

Investors · 7

Pioneerlisted by PioneerToronto, Ontario

How we know: Y Combinator's founder network · pioneerfund.vc · Not right? Tell us

Y Combinatorlisted by Y CombinatorSan Francisco · $500K

How we know: the Y Combinator directory · open dataset · 5k.vc investor directory · Not right? Tell us

Agrolimen Venturesreported

How we know: Y Combinator's founder network · Not right? Tell us

Eight CapitalreportedNorwalk

How we know: Y Combinator's founder network · Not right? Tell us

FoundersXreportedPalo Alto

How we know: Y Combinator's founder network · Not right? Tell us

Sandhill (ex Stonks)reportedSan Francisco

How we know: Y Combinator's founder network · Not right? Tell us

Sv Tech Ventures, Inc.reportedPalo Alto

How we know: Y Combinator's founder network · Not right? Tell us

Images

Letterbook photoLetterbook photo

Related companies · 5

ParahelpParahelp builds an AI-powered customer support agent that can be configured to integrate with external tools and APIs to resolve support tickets autonomously. The platform is designed for customer support operations teams seeking to automate ticket resolution at scale.
NaraNara provides AI agents that handle customer inquiries and sales interactions on websites and social media for small and medium-sized businesses, offering product recommendations and round-the-clock availability.
AtlasAtlas is a customer support platform that helps startups deliver white-glove support and manage customer relationships to reduce churn. The company serves early-stage companies that want to position support as a revenue driver rather than a cost center.
ChatwootChatwoot is an open-source customer communication platform that enables businesses to manage customer interactions across multiple channels. The company serves organizations seeking to enhance customer relationships through streamlined messaging and support tools.
ArigladAn AI tool that automatically creates and updates knowledge bases from Zendesk support tickets. It serves customer support and knowledge management teams in the SaaS and enterprise sectors.

Companies working in the same space as Letterbook.

Legal entities · 1

corporate structure
DCWU, Inc.

In the news

Letterbook - AI Customer Support Built for Startupsycombinator.com · Apr 2026🤵‍♂️ 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 Pioneer, Y Combinator, Agrolimen Ventures, Eight Capital, FoundersX, Sandhill (ex Stonks), Sv Tech Ventures, Inc..
Where is Letterbook headquartered?
Letterbook is headquartered in San Francisco, US.