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Slack Simulator
Local browser-based simulator for Slack app development
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.
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!
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! 👇
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About Slack Simulator on Product Hunt
“Local browser-based simulator for Slack app development”
Slack Simulator was submitted on Product Hunt and earned 0 upvotes and 1 comments, earning #1 Product of the Day. 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.
Slack Simulator was featured in Slack (72.2k followers), Developer Tools (519.9k followers) and GitHub (41.4k followers) on Product Hunt. Together, these topics include over 115.1k products, making this a competitive space to launch in.
Who hunted Slack Simulator?
Slack Simulator was hunted by Clyde D'Souza. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how Slack Simulator stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Clyde D'Souza
👋 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! 👇