Tech stack

Layer	What it uses
Web app	Next.js 16, React 19, Tailwind CSS v4, Motion
Backend	Convex: database, functions, streaming, crons
Auth	Clerk
Models	OpenRouter via the AI SDK
Tooling	Bun workspaces, TypeScript

Everything beyond Convex, Clerk, and OpenRouter is optional and switches on with its own keys: billing (Autumn), web search (Exa), memory (Supermemory), analytics (PostHog, Axiom), tracing (Braintrust), email (Resend), and the support agent (Median). Leave them out and Whirl hides the features they power. See docs/configuration.md.