RocketSim enhances the Xcode Simulator for iOS and iPadOS development: boost productivity and streamline your workflow with capture, networking, build insights, and quick actions beside the Simulator. Developers report building, testing, and verifying apps up to 2x faster per RocketSim Developer Research.
Key Highlights
- Polish screenshots and App Store Connect preview videos: open captures in the editor from the floating thumbnail, then tune bezels, touches, backgrounds, metadata, trim, and GIF export with App Store Connect-friendly dimensions—ideal for Swift, SwiftUI, and UIKit demos
- Debug networking without proxy certificates: throttle or drop traffic, Airplane Mode for your running app only, and inspect traffic via RocketSim Connect; use Copy Summary when you need a redacted line to paste into Slack or an agent prompt
- Track local build time trends next to Xcode with Build Insights across versions
- Exercise universal links, APNs payloads, GPS and time zones, environment overrides, and a VoiceOver overlay with keyboard navigation from the side window
- Pro: Simulator framebuffer recording up to 120 fps for fluid motion
Feature Breakdown
Screenshots and Recordings
- Start from the Captures tab in the side window; after capture, refine in the editor before export
- Bezels, touch callouts, optional metadata, audio, trim, GIF conversion
- Pro: 120 fps framebuffer recording when supported
Networking
- Simulate slow or lossy networks without slowing your Mac
- Per-app Airplane Mode in the Simulator only
- Inspect requests and responses; metrics; cURL export; trace export; Copy Summary for redacted sharing
- Speed control and monitor share a dedicated Networking area in the side window for quicker discovery
Accessibility
- VoiceOver overlay with keyboard navigation for testing in the Simulator without juggling a device as often
- Environment overrides from the side window: Bold Text, Dark Mode, Dynamic Type, and more—without opening Settings.app
- Tinted Liquid Glass legibility live on iOS 26 simulators
Build Insights
- Build count and duration trends in the main and side windows
- Compare performance across Xcode versions your team runs
Quick Actions for Builds
- Clear Derived Data globally or for the current app
- Open common app folders without Finder archaeology
- Grant, revoke, or reset permissions without reinstall churn
Compare Designs
- Overlay Figma, Sketch, or Zeplin frames on live UI
- Slider mode for pixel-level SwiftUI and UIKit checks
Design Tools and Magnify
- Grids and rulers in on-screen points; slow animations for layout polish
- Pixel zoom with color sampling as code
Deeplinks and Push Notifications
- Fire universal links and push payloads with the debugger attached
- Actions from recent builds; clipboard URL history; shareable Quick Action groups
- Grid or list layout for long route or push lists
Location Simulation
- Routes or single-pin GPS; time zones from a chosen place; Maps and travel flows
User Defaults Editor
- Live-edit standard and App Group defaults—flags, debug toggles, plist-backed state
Simulator Camera
- Mac camera in Simulator for AVFoundation, QR, and Vision-style demos
Full Customization
- Menu bar access including Open GitHub Issues
- Shortcuts and floating windows matched to your workflow
Trusted by Developers Everywhere
RocketSim is used daily by thousands of developers and 200+ teams—including teams at Meta, Runkeeper, and MacWhisper—to ship iOS apps with less friction. It fits TestFlight, App Store Connect, the Apple Developer app, and everyday Xcode use.
Xcode® is a trademark of Apple Inc., registered in the U.S. and other countries.
Terms of use: https://www.rocketsim.app/terms/
¹ Based on RocketSim Developer Research of 2024
This app hasn’t received enough ratings or reviews to display an overview.
Excellent Product, Superb Support
rlaurb
I’ve used RocketSim for years and regard it as an indispensable part of the development toolkit. And an important part of that is the outstanding support Antoine offers.Doing all that RocketSim does to extend the power of the Simulator — without modifying the Simulator itself — is amazing. But that means that changes to Simulator can affect how RocketSim functions. And that’s where Antoine’s customer support comes in. He is incredibly responsive to issues that arise. He makes RocketSim a product you can count on. Even as Simulator (and Xcode) change/evolve.
Screen recording is good
WokaWokaWoka
Got this for the screen recording feature. Had some initial trouble wrangling the output because the UI that appears when a video is saved is has black text on a black background, making it illegibile. I first opened the raw capture file by mistake (because you can accidentally drag it to a browser window before you save it) and was disappointed with the quality, but on my next try, the video produced by Saving the recording was much higher. Would love to see some more polish on this app, and maybe the ability to adjust the export compression level, including exporting with loss-less compression.
Developer Response
The compression options should not be available in version 5.0 from the preferences. Let us know if you still need more flexibility: https://github.com/AvdLee/RocketSimApp/issues
Timesaving necessary tool
sanguish
Absolutely essential. Being able to take screenshots and captures with bezels helps us to provide review pics/video to our design team.Having a way to actually see the current dynamic type setting is way more helpful that it may seem. Being able to examine the user defaults values with a click, set locations, turn off wifi. It is truely the app that keeps on giving.
Must have tool
swapp9
This is a great tool for any developer looking to get a little bit more out of the simulator app that accompanies Xcode. Personally, I love being able to record a gif on command, rather than right-click>save as gif on the simulator. I also love being able to take a screenshot(with bezels!!!) then overlay that screenshot to compare small changes!
New:
- Added a `Reset Keychain` quick action to the Recent Builds side window so you can clear a Simulator app's keychain without leaving RocketSim.
Improved:
- Build Insights now avoids unnecessary Core Data work and log reloads, improving responsiveness and reducing background churn.
- App Actions settings now reuse in-memory data instead of issuing extra fetches, making the settings screen more efficient.
- RocketSim Connect session lookups now happen off the main context during reconnect and new-run detection, reducing UI blocking.
Fixed:
- Fixed landscape MP4 recordings being generated incorrectly when using landscape orientation with device bezels. (Thanks, A. Machen!)
Version 15.0.3
The developer, SwiftLee, 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 Linked to You
The following data may be collected but it is not linked to your identity:
Usage Data
Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More