Plain — The AI Support Stack Built for B2B

# Plain > Plain is the API-first customer infrastructure platform for B2B SaaS companies. We unify customer support across Slack, Microsoft Teams, Discord, email, and chat into one fast, extensible platform built for technical teams. ## Company - Founded: 2022 - Headquarters: London, UK & San Francisco, US - Funding: $15M Series A (2025) - Website: https://plain.com ## What Plain Does Plain consolidates all customer conversations into a single platform with AI-powered workflows. Unlike legacy helpdesks built around email tickets, Plain is built API-first for teams that need extensibility, reliability, and customizability. ### Core Capabilities - **Multi-channel support**: Slack, Microsoft Teams, Discord, email, chat, and in-app messaging in one inbox - **API-first architecture**: GraphQL and REST APIs with everything accessible programmatically - **AI features**: Ari (AI agent), Sidekick (AI assistant), auto-triage, themes detection, similar threads - **Workflow automation**: Rules engine with triggers, conditions, and actions - **Customer context**: Real-time data from your systems via Customer Cards and CRM sync - **Help Center**: Built-in knowledge base with customer portal - **Integrations**: Linear, Jira, GitHub, Shortcut, HubSpot, Salesforce, and custom webhooks ## Who Uses Plain Plain is built for B2B SaaS companies with technical customers who expect fast, contextual support through modern channels like Slack. ### Ideal Customer Profile - B2B SaaS companies - Developer tools and infrastructure companies - Teams supporting customers in Slack or Microsoft Teams - Companies that need API extensibility - Technical support teams (not call centers) ### Notable Customers - Vercel (frontend cloud) - Cursor (AI code editor) - n8n (workflow automation) - Raycast (productivity tool) - Stytch (authentication) - Tines (security automation) - Sanity (content platform) - Tinybird (real-time analytics) - Ashby (recruiting software) - Sourcegraph (code intellige