The idea: make Effect's runtime observable — a visual tool for its concurrency model (fibers, scheduling, delays). Meant for learning and experimentation.

Features: - Fiber tree (parent-child relationships) - Timeline (concurrency, delays, running vs suspended fibers) - Execution log (fork, join, errors, retries, finalizers) - Code editor with example programs

v1 uses manual instrumentation with explicit tracing wrappers. v2 is planned with runtime hooks (Supervisor, Tracer) for automatic observability.

Demo: https://effect-viz.vercel.app Repo: https://github.com/topheman/effect-viz