Slack Simulator

What is Slack Simulator?

Build and test Slack apps locally—no live workspace required. This browser-based simulator replicates the full Slack UI and platform APIs, giving you a sandboxed environment to develop, debug, and iterate on bots and integrations end-to-end. Instantly test interactive components, slash commands, and webhook payloads without risk, overhead, or workspace admin permissions. Fast, lightweight, and completely private.