React Native, meet web.

An all-new simulator built on WASM.
Instant iOS and Android at 100x efficiency.
No native build, Mac, Java, or VM.

Setup

CLI

Copy prompt

$ rnx ios $ rnx do tap login-button $ rnx maestro flow.yaml --record $ rnx do gesture swipe-from-left-edge $ rnx box create → connected in 52ms · rnx shell appearance dark · rnx maestro flow.yaml --record · rnx do gesture swipe-from-left-edge

Durable Object

Sketch

Color

Home

Native without the pain

No Xcode, Java, no streaming VM. Run Metro apps in seconds with hot reload and modern dev tools.

Built for AI agents

A CLI designed for coding agents with fast automation and deep React and React Native hooks.

Zero-cost testing

Built-in Detox and Maestro support with integrated profiling, layout inspection, and network traces.

Instant live builds

Record and share in seconds, with automated GitHub bot previews on every commit and PR.

Much faster agents

Smart claims, waits, and occlusion checks give mobile coding agents 10× faster feedback loops.

Reduce CI costs

Run headless on Linux runners in CI without a Mac fleet. Save up to 100× on mobile infrastructure.

Faster, cheaper test runner

Native-speed Detox and Maestro tests without Xcode builds. Run test suites 10× faster and cheaper.

Share real builds instantly

Record interactive sessions anyone can scrub, inspect, or replay in the browser with zero install.

Remote simulators

Boot hosted simulators in the cloud from any bundle. Stream live sessions and inspect app state remotely.

Automate PR demo videos

Capture high-resolution video walkthroughs and screenshots on every PR automatically in CI.

[ Highlights ]

[ Conformance ]

90%

React Native · 99%

Essentials · 98%

Top 100 · 93%

Top 500 · 90%

Top 1k · 90%

React Native

99%

react-native-safe-area-context

100%

react-native-screens

100%

react-native-reanimated

99%

react-native-worklets

96%

@react-native-async-storage/async-storage

100%

react-native-gesture-handler

100%

react-native-svg

95%

@react-native-community/netinfo

react-native-get-random-values

100%

@react-native-masked-view/masked-view

100%

@react-native-community/datetimepicker

94%

react-native-keyboard-controller

@react-native-community/slider

93%

react-native-device-info

100%

@shopify/react-native-skia

92%

react-native-maps

90%

@react-native-firebase/app

95%

react-native-pager-view

85%

react-native-vector-icons

92%

@react-native-firebase/messaging

@react-native-firebase/analytics

95%

@react-native-google-signin/google-signin

80%

@react-native-picker/picker

76%

react-native-view-shot

82%

react-native-purchases

97%

react-native-share

95%

react-native-blob-util

93%

react-native-linear-gradient

93%

react-native-edge-to-edge

100%

react-native-permissions

93%

react-native-vision-camera

93%

@react-native-clipboard/clipboard

85%

react-native-keychain

93%

react-native-pdf

93%

react-native-haptic-feedback

93%

react-native-localize

95%

@react-native-menu/menu

@stripe/stripe-react-native

93%

@datadog/mobile-react-native

95%

@segment/sovran-react-native

85%

Browse all →

Will it run?

Drop your package.json to check compatibility.

[ Pricing ]

Free

Full simulator, CLI, and desktop appFree for personal, non-commercial useDetox and Maestro test driversLocal screenshots and recordings

Get started →

Pay as you go

$10/top-up

$5 free to start

License for CIRemote simulatorsGitHub playable build on each commitGitHub preview flows on each PRCloud recordings

Learn more →

Enterprise

Custom

Unlimited team sizeEmbed the simulatorSSO / SAML and security reviewSLA and account management

Talk to us →

[ Benchmarks ]

rnx

Native tooling

No native build

Metro and hot reload with no prebuild, CocoaPods, or xcodebuild. Changes appear in seconds.

Cold start to first inspectable UI24×

0.95s

23s

Tap round-trip17×

0.64s

11s

One test run7×

1.5s

11s

Median of 6 warm runs on an M5 Mac against iPhone 16 on iOS 26.4.

Bluesky test flow

The same Bluesky session driven across four screens. rnx finishes well ahead of native runners.

rnx

9.9s

Argent

11s

Maestro

24s

agent-device

58s

Median of 4 runs per runner on the same authenticated Bluesky flow.

More sims per machine

A native simulator boots an entire OS. An rnx simulator runs in a lightweight process, fitting multiple instances in the memory of one native sim.

4×simulators in memory

rnx · 908 MB

iOS Simulator · 4.1 GB

Physical footprint of one more instance: iPhone 16 / iOS 26.4 simulator with no app, against rnx with an unminified dev build.

A robust engine

Multi-threaded architecture with worker-isolated compositing, WebGPU-accelerated Skia, and intelligent damage tracking.

+WebGPU-rasterized CanvasKit

+Compositor in its own worker

+App in its own worker

+Damage tracking

+Reanimated worklets on UI thread

Quiet machine1.5ms avg · 2.28ms p95

~90% load1.5ms avg · 1.99ms p95

Shell profiler on GPU Chrome, iPhone 16 profile at 120Hz, 3 runs × 10 flick-scrolls over a 300-photo grid, quiet and beside a six-core load.

Go Headless

Run without a display for maximum memory efficiency while retaining full access to the view tree, screenshots, and input.

12%less memory, plus no GPU impact.

iOS Simulator

rnx

rnx headless

Reads the screen

Reads the view tree

Taps, types, scrolls

Runs without a Mac

Runs without a display

Measured across three concurrent sims per mode.

Cheaper CI

Run end-to-end tests on standard Linux runners instead of expensive macOS instances.

13×cheaper per 1,000 end-to-end runs

macOS runner31 min

$1,922

Linux runner24 min

$144

Bundle and test

Pods, native build, simulator boot

Modelled on GitHub-hosted private-repo rates (August 2026) and warm-cache phase times from a public React Native E2E workflow.