Plain

Plain provides AI support infrastructure that B2B teams use to handle customer conversations in Slack, Microsoft Teams, Discord, email, live chat and a headless portal within one workspace. Its products include Ari, a customer-facing AI agent, Sidekick, an internal assistant for support staff, workflow automation, and an API-first model that allows the product to be extended or embedded.

The website names Cursor, Sanity and Granola as customers. Pricing is subscription-based per seat: the Foundation plan is listed at $45 per user per month billed annually, the Horizon plan at $99 per user per month, and the Frontier plan is custom-priced. Plans include credits, and AI agent resolutions consume credits at 100 credits per resolution.

The company was founded in 2020 and is registered in the United Kingdom. Its website lists job openings in London and San Francisco, including full-stack and senior product engineers and a product marketing lead. The website states that Plain raised a $15m Series A led by Battery Ventures, with continued participation from Index Ventures and Connect Ventures.

Product: Composable customer support platform with multi-channel inbox, AI agent Ari, internal assistant Sidekick, workflow automation and a public API.