SimKit — For Xcode Simulator
Network Monitor, Mock & Debug
Only for Mac
Free
Mac
Stop rebuilding your app for every edge case.
SimKit is the ultimate companion tool for iOS developers and QA engineers. It allows you to manipulate your app's environment, data, and network conditions in real-time, saving you hours of debugging time every week.
Whether you need to test how your app handles a 500 error, inspect a JSON response body, or verify your UI in a different language, SimKit puts the control in your hands.
KEY FEATURES:
ADVANCED NETWORK DEBUGGING • Monitor Traffic: View all outgoing API requests, headers, and response bodies instantly. • Mock Responses: Force specific endpoints to return custom JSON or error codes (404, 500) to test failure states. • Network Throttling: Simulate real-world conditions like 3G, LTE, High Latency, or complete Offline mode.
LOCATION SIMULATION • Teleport your device anywhere in the world. • Use preset locations (London, Tokyo, New York) or input custom coordinates. • Test location-based features without leaving your desk.
REAL-TIME DATA EDITING • UserDefaults Editor: View, search, and modify UserDefaults keys instantly. • Type Support: Edit Strings, Booleans, Integers, and more with a native UI. • Instant Updates: See changes reflect in your app immediately without a relaunch.
LOCALIZATION & PERMISSIONS • Locale Testing: Switch your app's language and region on the fly to test translations and date formats. • Permission Manager: Toggle system permissions (Camera, Photo Library, Location) ON or OFF to test authorized/denied states.
DEEP LINK TESTER • Trigger custom URL schemes and Universal Links with a single click. • Save recent deep links for repetitive testing.
SimKit is designed to help you build better apps, faster.
Privacy Policy: https://ealtaca.github.io/simkit-website/privacy-policy
Terms of Use: https://ealtaca.github.io/simkit-website/terms-of-use
Ratings & Reviews
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Four new tools for your network workflow.
Contracts
Save the shape of an API response and get warned the moment that endpoint starts returning something different — drift shows up as a banner and a badge, so backend changes never catch you off guard.
Edit & Resend
Right-click any captured request to change its method, URL, headers or body, send it again, and inspect the response side by side.
Load Tests
Fire a burst of concurrent requests at an endpoint and watch the results build up live: success rate, min/avg/max, median and p95 latency, plus a breakdown by status code and error.
WebView Requests
Page loads inside embedded web views now appear in the request list with their own badge, instead of being invisible. Requires updating the SimKit SDK in your app to 1.6.0.
The developer, Emre Can Altaca, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Emre Can Altaca
- Size
- 47.2 MB
- Category
- Developer Tools
- Compatibility
Requires macOS 14.0 or later.
- Mac
Requires macOS 14.0 or later.
- Mac
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- Copyright © 2026 SimKit. All rights reserved.