Lucidra is a local-first API engineering workspace for Linux, macOS and Windows. Build and send HTTP, GraphQL, WebSocket, Socket.IO, gRPC and SSE requests. Receive webhooks, tunnel public traffic to localhost and inspect email. Trace HTTP/HTTPS, match captures to saved requests and review differences. Turn real flows into suites, async scenarios and regressions; add mocks, contracts, Docs, visual Git and permissioned MCP for AI agents. Personal workspaces are free and need no account.