An Effect runtime visualizer that runs in the browser. Written in Effect

#1

Post by topheman » Thu, Feb 12, 2026, 10:40 PM UTC

An Effect runtime visualizer that runs in the browser. Written in Effect
effect-viz.vercel.app

Re: An Effect runtime visualizer that runs in the browser. Written in Effect

#2

Post by topheman » Thu, Feb 12, 2026, 10:40 PM UTC

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

Re: An Effect runtime visualizer that runs in the browser. Written in Effect

#3

Post by jauntywundrkind » Fri, Feb 13, 2026, 5:50 AM UTC

topheman wrote: post #2

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 wrap…

Really gorgeous. Awesome to see compute come alive like this!!