The AI support stack built for B2B teams. Composable infrastructure that gives you complete flexibility to build a support motion that grows with your business.
A bootstrapped team from Ukraine built a customer-support suite that does what Intercom does, minus the bill that grows every time a customer says hello.
A better customer experience across support, marketing, and sales.

AI assistant, omnichannel support desk, knowledge base. Everything you need for seamless customer support, all in one place.
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.
Atlas is an AI-first customer support platform that pitches itself as a modern replacement for Intercom and Zendesk. It combines ticketing, an omnichannel inbox (chat, email, WhatsApp, SMS, Slack Connect, Discord), session recording, customer timelines, a help center and AI agents (Autopilot and Copilot) so support teams can resolve issues faster by understanding customers more completely. Founded in 2021 by Jon O'Bryan and Rahul Asati and backed by Y Combinator (W22), Atlas is built around the idea that great support drives growth rather than being a cost center.