Decoy

Native macOS mock server app — create endpoints, inspect requests, and mock responses without Docker or config files

decoy-app.com

Verified

Quick facts
What is it	Native macOS mock server app — create endpoints, inspect requests, and mock responses without Docker or config files
Pricing	Unknown
Platform	Desktop Application
Best for	testing API integrations, simulating server responses
Domain registered	2026

Data updated May 31, 2026

What does Decoy do?

Decoy is a native macOS application that creates local mock servers for development and testing. It lets developers define HTTP endpoints, inspect incoming requests, and configure mock responses without needing Docker containers, cloud tunnels, or configuration files. The app runs directly on your Mac and provides a clean three-panel interface for managing endpoints, monitoring requests, and editing responses.

The tool supports seven response body types including JSON, HTML, XML, and file serving, with syntax highlighting and automatic formatting. Developers can set custom status codes, add headers, simulate latency, and use parameterized paths. Requests are stored in SQLite for persistence, and the app includes workflow features like code snippet export (cURL, JavaScript, Ruby) and project organization through subdomains.

Decoy is built for developers who need to test API integrations, webhook handling, or error scenarios. It works particularly well for frontend developers waiting for backend APIs, API developers testing client behavior, or QA engineers simulating various server responses. The native SwiftUI implementation ensures fast startup times and minimal resource usage compared to container-based solutions.

Non-AI Developer Tools — Other

#api testing#development#http#local development#macos#mock server

Key features

What makes it stand out

Define HTTP endpoints with method-path pairs and group them into projects

Inspect incoming requests with headers, body, source IP, and formatted JSON

Mock responses with 7 body types, custom status codes, headers, and latency simulation

Export requests as code snippets (cURL, JavaScript fetch, Ruby)

Works with custom domains including decoy.my and lvh.me on port 8998

Who is Decoy for?

Who benefits most from this tool

testing API integrations

simulating server responses

debugging webhook handling

Trust & presence

Domain Domain registered 2026

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