Plain

Plain is the AI-native customer support platform for B2B companies, unifying Slack, Teams, Discord, email, and chat into one fast, API-first workspace.

Overview

B2B support doesn’t happen in a help-desk widget — it happens in shared Slack channels, Teams threads, and inboxes spread across every customer. Plain, founded in 2020, was built for exactly that reality: it pulls Slack Connect, Microsoft Teams, Discord, email, and chat into a single queue so no customer message is ever missed, and it does so with an API-first architecture where everything in the UI is available programmatically.

Its AI agent, Ari, is included on every plan (not billed per resolution) and answers from your knowledge base, searches connected tools, and investigates issues before handing off to a human with full context. Sidekick, the agent-facing copilot, drafts responses and runs on AI credits. Customers include Vercel, Cursor, n8n, Raycast, and Sourcegraph — companies whose own users are deeply technical.

Key Features

• Unified multi-channel inbox: Slack Connect, Teams, Discord, email, and chat in one queue with no duplicate notifications.
• Ari AI agent: resolves routine questions from your knowledge base and connected tools, with configurable handoff rules — included on all plans.
• Sidekick copilot: drafts responses for human agents to review and send, powered by AI credits.
• API-first platform: full GraphQL and REST APIs plus machine users, so teams can build custom agents and routing logic.
• SLA management: tiered SLAs with real-time breach alerts, routing, escalation, and automation rules.
• Knowledge capture: every resolved conversation feeds a searchable knowledge base and help center.

💳 Pricing

Foundation $35/month (1 seat included, +$35 per additional seat, up to 5 seats, 2,000 AI credits/month). Horizon $299/month (3 seats included, +$99 per additional, up to 10 seats, 15,000 AI credits). Frontier is custom (SSO, directory sync, bring-your-own-agent). A 7-day free trial is available with no credit card, and startups get 50% off eligible plans. Pricing from plain.com/pricing.

Who Is It For

Built for B2B software companies — especially technical products — supporting customers over Slack and email. Consumer-facing, high-volume B2C support teams will find chat-first tools like Intercom a better fit.