Plain

AI support stack for B2B teams with an autonomous agent and API-first infrastructure

Aboutplain.com

Plain is an AI customer support stack for B2B teams. It offers composable infrastructure for no-code or all-code support flows and Ari, an autonomous support agent that works where customers already are. It is API-first with fast setup.

For an agent

Use it for B2B support with deep product integrations. Review how the agent hands off to people.

Why it is here. It is a modern support platform for B2B products.

Install command, framework, licence and component list.

Notable for

Autonomous agent Ari
API-first

Provenance

Verified 2026-10-09. HTTP 200. https://www.plain.com/ (HTTP 200, page fetched 2026-10-09), depo.zip listing https://www.depo.zip/tools/j579ew1pczy296xsnefkrgkgh97t5akv

Utilities & Naming

Best in classBeautiful Mermaid3Zero-DOM TypeScript Mermaid renderer with SVG and ASCII outputUtilities & NamingGeneratorTool
Best in classInstant Domain SearchKeystroke-speed domain availability across 800+ TLDs, with a free MCP serverUtilities & NamingToolMCP Server
Best in classUnoCSSOn-demand atomic CSS engine with swappable presets, ~6kb, no core utilitiesUtilities & NamingToolGenerator
Strong pickBannerbearREST API that renders images, video and PDF from reusable design templatesUtilities & NamingServiceTool
Strong pickcubic-bezier.com2Lea Verou's bezier curve editor: drag the handles, compare against presets, share via URLUtilities & NamingToolReference
Strong pickdelphitools~57 browser-local design utilities: colour, image, type, print, no loginUtilities & NamingToolGenerator
Strong pickEasings.net230 standard easing curves, each with an animated demo, a cubic-bezier value and TS sourceUtilities & NamingReferenceTool
Strong pickEtymonlineEtymology dictionary of English word origins, running since 2001Utilities & NamingReferenceApp