React Native iOS, in the browser

Pricing

A new React Native iOS simulator.

No Mac, no XCode, no problem.A 100% web-based iOS simulator for React Native.
Makes agents 10x faster and simulators ∞ cheaper.

Download (macOS)

macOS (Intel)Linux (x64)

npm i -g sootsim

Use Cases

Make native development feel as smooth as the web

Developers smoke test, designers playtest, clients test-drive — from a URL.

No Xcode, no simulator install, no device farm.

Real scrolling, keyboard, gestures, and springs on their own GPU.

Share interactive previews of local work in seconds

One flag turns what you're building into a live URL — not a screenshot.

Tap, type, scroll, and feel the app wake up.

Pre-seed a demo account, theme, locale, or device in the URL.

Automatic demo flows just by pushing a PR

A sticky GitHub comment with a live preview and a recording of the change.

Record a real session once; every PR replays it.

Failures keep the screen, app tree, console, and error payload.

Run mobile checks without Mac runners

Keep useful native-preview confidence without waiting on simulator builds.

Headless Chromium gives every push a cheap native-preview pass.

Use the iOS oracle only when you need final parity.

Features

Build & run your app

Prefix your dev command. Get a live iOS preview on whatever machine you're already using.

Vanilla Metro bundles run unchanged. No rewrites, no fork.

Install with npm i -g sootsim; add plugins later for source linking.

Preview instantly

Turn local work into a live, recorded native preview your team can touch.

Share a URL that boots into the flow, account, theme, and device you choose.

Record live demo flows once, then replay them for PRs, QA, and docs.

Agent-native inspection

Agents get semantic control instead of OCR, brittle selectors, or guesswork.

Buttons, inputs, links, labels, and text are queryable directly.

Commands wait for app stability, so agents avoid mid-animation races.

Promote your app

Create launch assets from the same render path your preview uses.

Compose App Store screenshots from YAML: devices, poses, backgrounds, copy.

Use 3D mode, live embeds, screenshots, and recordings from one source.

Engine

Real React Native, not a polyfill

Your existing bundle boots on real RN primitives inside a browser tab.

Regular Metro bundles run without translating the app to React DOM.

React, Yoga, gestures, animation, text, and Skia rendering stay together.

200+ libraries already wired

Native-module shims where needed; pure-JS packages compose the primitives.

Reanimated, Gesture Handler, Screens, FlashList, bottom sheets, SVG, WebView.

Navigation and pure-JS packages work because the primitives are real.

iOS behavior, drawn in Skia

The phone chrome and system surfaces are part of the render world.

Keyboard, alerts, sheets, notifications, image picker, and liquid glass.

Scroll physics, hit testing, color, emoji, and text aim at device parity.

Queryable, recordable runtime

Humans, agents, and CI can all drive the same app and keep evidence.

A semantic DOM mirror lets tools read the canvas like a website.

The CLI can tap, type, inspect, settle, record, screenshot, and export.

Compatibility

Core

99%

128 pixel-checks

Top 100

88%

88 of 100 native

Top 500

29%

146 of 500 native

top 500 native libraries by weekly downloads

verified

works

partial

not yet

native

all

Essentials(5 of 5)

react-native

the framework itself · 54 pixel-checked surfaces

97%

react-native-gesture-handler

DrawerLayout (passthrough noop), NativeViewGestureHandler still lacks native-scroll coupling and handlerTag semantics, cross-detector simultaneousWithExternalGesture/requireExternalGestureToFail, ForceTouch semantics are placeholder-only

99%

react-native-screens

freezeEnabled/enableFreeze (always false), statusBarStyle/Hidden/navigationBarColor/Hidden ignored, replaceAnimation differentiation, formSheet/pageSheet modal differences, integrated search bar placements

99%

react-native-keyboard-controller

per-frame keyboard progress events (smooth `onMove` requires SAB-backed shared values driven from the shell-side keyboard animation; deferred — see plans/real-worklets.md)

98%

react-native-keyboard-controller sootsim

react-native-reanimated

layout animation builders are exported but no enter/exit animation actually plays, useScrollViewOffset returns static 0, useAnimatedSensor static, useReducedMotion always false, useAnimatedKeyboard height tracking returns 0

98%

All Packages(166 of 202)

1-12 of 166

1 / 14

expo-video

player.duration stays 0 (no timeupdate listener), player.currentTime not synced from element, statusChange/volumeChange/timeUpdate events not emitted, useEvent hook not exported, DRM support absent

100%

react-native-pager-view

overdrag (accepted but ignored), offscreenPageLimit (accepted but ignored), pageMargin, keyboardDismissMode, native scroll fidelity (momentum physics differ)

99%

@mozzius/expo-dynamic-app-icon

noop icon switching — correct for browser, useDynamicAppIcon hook is functional

100%

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

full localStorage-backed implementation

100%

@react-native-community/checkbox

HTML checkbox input with accentColor tinting

100%

@react-native-community/datetimepicker

HTML date/time/datetime-local input; Android imperative API stubbed

100%

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

engine-level masked-view node with canvaskit saveLayer + BlendMode.DstIn alpha compositing

100%

@react-native-picker/picker

HTML select element with full Picker API including Picker.Item, modes, focus/blur

100%

@welldone-software/why-did-you-render

intentional noop — wdyr mutates React internals and crashes sootsim's bridged React

100%

expo-glass-effect

liquid glass via CanvasKit _liquidGlass style descriptor; hooks and availability covered

100%

expo-linear-gradient

CanvasKit gradient shader via _gradientColors style prop, full API

100%

expo-sms

SMS not available on web; isAvailableAsync returns false, sendSMSAsync returns cancelled (correct)

100%

1-12 of 166

1 / 14

verified

works

partial

not yet