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The iOS Simulator companion for developers and AI coding agents
The Simulator,
supercharged.
RocketSim adds 30+ developer tools to Xcode's Simulator, so you and your AI coding agent can inspect, test, and capture your app without leaving your flow.
No signup. Works with Xcode 16+ and Xcode 27's Device Hub.
RocketSim at a glance
Used by iOS developers at
- 25,000+ developers
- 250+ teams
- Up to 2× faster, developers report
Agentic Coding
Your agent can finally see the Simulator.
The built-in CLI and Agent Skill let Cursor, Claude, Codex, and Xcode read the screen, tap, type, and verify their own work. Follow along live in your browser and point at exactly what needs to change.
# Check RocketSim is ready rocketsim doctor# Read the screen as text, not pixels rocketsim elements --agent# Tap the Continue button rocketsim interact tap --label "Continue"# Wait until the screen changes rocketsim wait screen-changed# Test on a slow network rocketsim network set 3g# Record proof for the PR rocketsim video record --touches > demo.mp4About 95%
less of your agent's context than other Simulator-control tools.
- fewer tokens
- 99%+
- faster
- About 24%
Head-to-head benchmark, July 2026. Tokens and context estimated from output size.
Screenshots & Videos
Captures worth sharing.
Record the Simulator with device bezels and touch indicators, polish it in the Post Editor, and drag the result straight into App Store Connect, GitHub, or Slack.
Touch indicators and device bezels. Demos anyone can follow, ready to post.
Record at 120 FPS. Scrolling, animations, and transitions stay silky smooth.
A built-in Post Editor. Trim, reframe, and restyle after you hit stop.
Drag it anywhere. App Store Connect, GitHub, Slack, or iMessage, straight from the floating capture.
09:41 in one click. The keynote-ready status bar, full bars included.
Bezels, backgrounds, ratios. Marketing-ready screenshots without opening a design tool.
Developers can't stop talking about it.
4.8 stars on the App Store
Network Monitoring
See every request. Before you set a breakpoint.
Inspect URLSession requests, responses, headers, and app logs as they happen, without a proxy or certificates. Throttle the connection, flip on airplane mode, and hand your AI assistant a privacy-redacted summary.
Made possible by Pulse, an open-source project created by Alex Grebenyuk.
For you
Start building faster today.
Free to download, no signup. Unlock Pro when you need more.
Free downloadFor your team
Make the whole team faster.
Shared licenses and Team Build Insights. Try it free for 14 days.
Start a 14-day Teams TrialDevelopers report building, testing, and verifying apps up to 2× faster with RocketSim.
Real-World Testing
Reach the states that are hard to reach.
Send push notifications, open deep links, simulate walking and driving routes, and reset permissions in one click. Then test the same deep links and routes on a real iPhone or iPad.
Design & Accessibility
Pixel-perfect, and usable by everyone.
Overlay the design on your running app, measure with grids and rulers, and slow animations down to catch every frame. VoiceOver Navigator shows the reading order right on the Simulator — no device needed.
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Drop in the design and check your build with an overlay or a slider. Differences jump out right in the Simulator.
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Overlay a grid to align elements across the screen. Change its color and spacing to match your design system.
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Horizontal and vertical rulers show exact positions in points. Hold ⇧ Shift to see the distance between them.
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Hold ⇧ Shift to magnify any pixel, then copy its color as SwiftUI, UIColor, or NSColor code.
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Slow every animation down to catch the frame where a transition goes wrong.
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Find missing labels, small touch targets, and low contrast on the screen you are looking at. Select a finding to see it highlighted in the Simulator.
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See the VoiceOver reading order as numbered labels, and walk through it with your arrow keys. No device needed.
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Switch Dynamic Type sizes, bold text, inverted colors, and reduce motion without digging through Settings.
Build Insights for Teams
Know when your builds get slower.
Track every Xcode build, compare clean and incremental times, and see how machines and Xcode versions affect your whole team. It syncs in the background, with no build scripts.
“RocketSim Team Insights finally gives us visibility into our build times beyond just gut feeling.”
Join thousands of productive developers.
See what others say about RocketSim on social media.
Questions developers ask.
The short answers about RocketSim, AI coding agents, and pricing.
What is the best way to let an AI coding agent control and test the iOS Simulator?
Use RocketSim's built-in CLI and Agent Skill. RocketSim stays connected to the Simulator, so Claude Code, Codex, Cursor, or Xcode's agent can read the screen as compact text, tap, type, swipe, wait for changes, and take screenshots without rebuilding context at every step. In RocketSim's July 2026 benchmark it used the least context of the tools tested. Install both from Settings → CLI & Agent, and start your app with Xcode as usual. See the agentic development overview.
What is the best MCP server or CLI for the iOS Simulator?
For low context usage, RocketSim's CLI and Agent Skill. RocketSim deliberately does not ship an MCP server: an MCP server puts its whole tool catalog into the agent's context before the first action, while the skill's instructions load when the agent needs them and the CLI returns compact output. In RocketSim's July 2026 benchmark, XcodeBuildMCP 2.7.0 produced 3.0x the tool-response bytes and an 8.2x higher estimated context load, and AXe 1.8.0's raw output was 21.0x higher. These are byte-based estimates, not billed tokens. Read the full comparison in iOS Simulator MCP vs CLI for AI Agents.
Which agent skills or CLI tools help Claude Code build, run, and verify iOS apps?
Pair a build tool with RocketSim. XcodeBuildMCP or Xcode's MCP bridge builds and runs your app, and RocketSim's Agent Skill and CLI let Claude Code, Codex, or Cursor verify it in the Simulator by reading visible elements, tapping, typing, and taking screenshots. RocketSim does not build or launch your app, so the two cover different halves of the loop. The setup guide shows how to install both.
How can I inspect network requests from my iOS app in the Simulator without Charles Proxy certificates?
Use RocketSim's Network Monitor. Powered by RocketSim Connect, it shows outgoing URLSession requests from your Simulator app without a proxy, custom certificates, or leaving the Simulator. You can inspect headers, bodies, status codes, logs, and cURL commands, and export redacted request summaries as prompts for AI assistants.
How do I simulate a slow or offline network connection in the iOS Simulator?
RocketSim's Network Speed Control throttles your Simulator app to 3G or Edge, applies 100% packet loss, or turns on Simulator Airplane Mode, while your Mac stays online. Use the Networking tab in RocketSim's side window or the rocketsim network CLI. Apple's Network Link Conditioner throttles the whole Mac, while RocketSim limits the change to the Simulator app.
Is there a way to mirror or record my physical iPhone while developing in Xcode?
Yes. RocketSim mirrors a USB-connected iPhone or iPad beside Xcode and captures screenshots, GIFs, and video with device audio. It can also inspect recent builds, launch or relaunch apps, open deep links, and, with RocketSim 16.4 and Xcode 27, simulate locations on real hardware.
What is RocketSim for Xcode, and is it worth it?
RocketSim is a macOS app that adds 30+ developer tools to Xcode's iOS Simulator and to connected iPhones and iPads: screenshots and recordings, URLSession network monitoring, app actions such as push notifications and deep links, accessibility tools, build insights, and a CLI and Agent Skill for AI coding agents. See all features. More than 25,000 developers and 250 teams use it. It works with Xcode 16 and later, including Xcode 27's Device Hub, and the Free plan needs no account.
How much does RocketSim cost?
RocketSim is free to download, and the Free plan needs no account. Personal Pro is bought in-app at your local App Store price. In the US it costs $9.99 per month or $69.99 per year, and other countries differ. Teams costs €10 per seat per month, billed annually, with a 14-day trial. Compare all plans on the pricing page.
Spend less time operating the Simulator.
Spend more time building your app.
No signup. Works with Xcode 16+ and Xcode 27's Device Hub.
Stay ahead of what's new in RocketSim.
New releases, beta invites, workflow improvements, and early-access announcements in your inbox.