RocketSim for Xcode Simulator 4+

Build Swift Apps Faster


    • 4.7 • 153 Ratings
    • Free
    • Offers In-App Purchases



Add Unique features to Xcode's Simulator and Build Apps Faster.
Key features: User Defaults Editor, Simulator Airplane Mode, Recordings with sound, touches & bezels. Accessibility & Dynamic Type Testing, Location Simulation, Test Push Notifications, Deeplinks, and compare designs on top of the Simulator.

Inspect Network Traffic
* Monitor in- and outgoing requests for your apps
* Explore JSON responses, requests & response headers
* Copy requests as cURL commands
* Investigate request metrics

Build Insights
* Keep track of build count and duration
* Find out how your app's build times improve per Xcode version

User Defaults Editor
* View and Edit User Defaults values in real time
* Works with both standard and group User Defaults

Location Simulation
* Scenario testing: City Run, Bicycle run, and Freeway Drive
* Simulate routes from start to destination using Quick Actions
* Update GPS to a specific point on the map
* Change the time zone whenever you update the location

Grids & Rulers helps you to create pixel-perfect design implementations
* Use horizontal and vertical rulers
* Measure the distance between elements in on-device pixels
* Configure grid size and color

Quick actions for your recent builds help you increase productivity
* Delete Derived Data easily, globally or per app, to prevent rebuilding all your Xcode projects.
* Open common directories like your app's documents folder
* Read and write user defaults
* Grant, revoke, or reset permissions like photo and location access, allowing you to test related implementations quickly
* Airplane mode: Disable Networking for your app while keeping a working connection on your Mac

Environment Overrides
* Switch Accessibility settings like Inverted Colors and Bold Text
* Configure any Dynamic Type directly from the side window

Deeplinks (Universal Links) and Push Notifications
* Add quick actions to test Deeplinks and Push Notifications
* Bundle Identifier based: actions automatically show up for recent builds
* Launch deeplinks to test routing in your apps
* Easily launch deeplinks from your clipboard
* Manage and share Quick Action groups with your colleagues

Compare Designs for pixel-perfect design implementations
* Create pixel-perfect implementations of your app’s design
* Drag, Paste, or Select images for comparison
* Use the overlay mode to compare your app’s implementation to its design
* The slider allows you to slide between your app’s implementation and its design
* Any image source, whether it’s Sketch, Figma, or Zeplin.

Magnify for precision
* Zoom in at pixel level to verify your design implementation

Create screenshots
* Device Bezels create that professional screen capture you need
* Adjust the background color to match your styling

Create professional recordings to share progress
* A popup next to the active Simulator allows you to start a recording easily
* Enable touches to explain better how your app responds to user interaction
* Device Bezels create that professional impression you need
* Export-ready for App Store Connect. Creating App Previews has never been easier
* Landscape orientation is correctly applied in the exported video
* A floating thumbnail with the resulting recording allows one to drag into any destination easily
* Select MP4 or GIF to match your needs
* Trim videos for perfect lengths
* Control the quality of exports for perfect performance

Completely customizable to fit your needs
* All actions are available through the status bar menu as well. Configure to hide the floating windows if you feel like they're in your way
* Configure shortcuts to perform actions even quicker

Each feature is developed with a focus on productivity to keep you in your flow. Configure the available shortcuts to improve this even more.

Xcode® is a trademark of Apple Inc., registered in the U.S. and other countries.
Terms of use:

What’s New

Version 12.11.4

- NEW: Updated the onboarding and added feature previews to the sales page.
- FIXED: A crash happening for some clients due to CA_ASSERT_MAIN_THREAD_TRANSACTIONS (Thanks, J. Riley!)
- FIXED: A crash happening when turning on/off slow animations

Ratings and Reviews

4.7 out of 5
153 Ratings

153 Ratings

sanguish ,

Timesaving necessary tool

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.

WokaWokaWoka ,

Screen recording is good

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:

swapp9 ,

Must have tool

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!

App Privacy

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

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