# Letterbook

> Letterbook is an AI-native customer support platform built for startups and lean teams. It connects to a company's inbox, database, and Stripe, then uses AI to triage tickets, draft resolutions, and build a knowledge base - all reviewed by a human before sending. Founded in 2023 by Dawson Chen and Ethan Hou and backed by Y Combinator (S23), it positions itself as the modern alternative to Zendesk, Freshdesk, Intercom, and Front.

- **Founded:** 2023
- **Headquarters:** San Francisco, United States
- **Founders:** Dawson Chen (Co-founder & CEO), Ethan Hou (Co-founder)
- **Team size:** 2
- **Products:** Letterbook AI Support Platform, AI Support Agent, Help Center, Analytics
- **Notable:** Reached #3 Product of the Day on Product Hunt with 269 upvotes, Backed by Y Combinator (Summer 2023 batch), Replaced Intercom, Zendesk, Zohodesk, Helpscout, and Freshdesk for multiple fast-growing YC companies

## Products & services

- **Letterbook AI Support Platform** — An AI-native helpdesk that connects to your inbox, database, knowledge base, and Stripe. The AI triages, labels, routes, and drafts resolutions to support tickets across email, web forms, Discord, API, and mobile, with a human reviewing before sending.
- **AI Support Agent** — An AI agent with access to live customer data that auto-prepares ticket resolutions and can execute custom workflows for specific scenarios.
- **Help Center** — Hosted customer self-service documentation and knowledge base built alongside ticket handling.
- **Analytics** — Support performance metrics including first response time and resolution rates.

## Achievements

- Reached #3 Product of the Day on Product Hunt with 269 upvotes
- Backed by Y Combinator (Summer 2023 batch)
- Replaced Intercom, Zendesk, Zohodesk, Helpscout, and Freshdesk for multiple fast-growing YC companies
- Founders previously grew AI personal assistant Martin to 100,000 users

## Latest updates

- **2026-03** — Letterbook featured on Product Hunt as the modern alternative to Zendesk, Freshdesk, Intercom, and Front, reaching #3 Product of the Day.
- **2023-08** — Letterbook joins Y Combinator's Summer 2023 batch.

## Links

- Website: https://letterbook.ai
- LinkedIn: http://www.linkedin.com/company/letterbook-ai
- Twitter/X: https://twitter.com/letterbookai

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Profile page: https://yespress.io/letterbook-yc-s23
Published by YesPress — https://yespress.io
Last updated: 2026-07-30