Launching today
Slack Simulator
Local browser-based simulator for Slack app development
1 follower
Local browser-based simulator for Slack app development
1 follower
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.
👋 Hey Product Hunt!
I’m Clyde, creator of Slack Simulator.
If you’ve ever built a Slack bot or app, you know the drill: setting up ngrok tunnels, creating dedicated test workspaces, managing OAuth flows, and praying you don't accidentally trigger spammy test messages in live channels while debugging.
I built Slack Simulator to fix the inner dev loop for Slack developers. It’s a local, browser-based simulator that lets you build and test Slack applications end-to-end—no live Slack workspace or internet connection required.
What makes it awesome
Instant Iteration: No ngrok, no OAuth dance, and zero network lag. Just run it locally and point your app at it.
Multi-User Testing: Switch between mock users in one click to test multi-user conversations, approval flows, and permissions.
Full Visibility & Debugging: Inspect Events, Interactivity payloads, Web API calls, and raw SQLite database state in real-time.
Deterministic Resets: Wipe your workspace back to a clean seed state instantly for reproducible testing scenarios.
100% Offline-First: Work anywhere—on planes, trains, or spots with unreliable Wi-Fi.
It supports Bot messages, Block Kit, Modals, Slash Commands, Socket Mode, HTTP endpoints, Webhooks, and more!
🔗 Try it out: https://github.com/ClydeDz/slack-simulator
🔗 Documentation: https://clydedz.github.io/slack-simulator/
🔗 Discord: https://discord.gg/jBfYWyf6xB
I’d love to know what you think! What’s your biggest pain point when building Slack apps? I'll be hanging around all day to answer questions and hear your feedback! 👇