--- title: "Cross-Platform Code Verification" description: "Validate shared code across iOS, Android, web, and TV in one QA flow, so platform-specific issues cannot hide." url: https://www.callstack.com/services/cross-platform-code-verification updated: 2026-11-09T15:59:12.298Z --- # Cross-Platform Code Verification Validate shared code across iOS, Android, web, and TV in one QA flow, so platform-specific issues cannot hide. _[Agentic Delivery](/agentic-delivery) › [AI-Driven QA & Testing](/capabilities/ai-driven-qa-testing)_ **Shared code, verified on every platform** One codebase does not mean one behavior. Our QA agent runs the same flows on iOS, Android, web, and TV and compares the results, so platform-specific breakage surfaces before users find it. ## AI-Driven QA & Testing - Industry runs on our tooling · 50M+ OSS downloads / month - 100+ Enterprise projects delivered - React Foundation Founding Member · 300+ commits to React Native · Contributing since 2016 - Expensify uses agent-device for bug evidence. Its usage story covers collecting evidence from mobile apps and profiling. - ~6x Faster prototyping · 60+ Components mapped with full coverage · Figma · Claude · Server · Tailwind · Tokens · React · Cursor · ESLint - 3.7× Lower task cost vs Opus 5.5 - Testing Library · Testing utilities in our open-source toolkit for checking React Native behavior. ## What you get: One flow, every platform, compared. - **Same test, every platform** Plain-language specs executed identically across iOS, Android, web, and TV. - **Behavioral diffing** Screens, flows, and outputs compared across platforms to expose divergence. - **Real devices, not simulators** Runs on physical hardware through Agent Device, where gestures and rendering actually differ. - **Platform-tagged findings** Issues reported per platform with recordings and reproduction steps. - **PR-level verification** Shared-code changes checked on all target platforms before merge. - **Coverage visibility** A clear view of which platforms each critical flow is verified on. ## Scope → Build → Scale: Design QA that keeps delivery moving. ### Scope (1 WEEK) We select a product workflow, define where agents act, and agree the controls and success measures. - Workflow and owners defined - Baseline and controls agreed - Token budgets confirmed ### Build (1-12 MONTHS) We connect context, agents, and verification to your tools, then run the workflow on your product backlog. - Running on your product backlog - Speed and quality measured - Business impact validated ### Scale (AS NEEDED) We document the workflow, transfer ownership, and extend it across teams and products based on results. - Your team owns the workflow - Expand based on results - Full knowledge handover ## What shipping at AI speed looks like. - [Building an Agentic SDLC for a Web Launch in Under One Month](/case-studies/building-an-agentic-sdlc-for-a-web-launch-in-under-one-month): 3x estimated delivery acceleration - [Engineering AI Loops for a Cross-Platform Design System](/case-studies/engineering-ai-loops-for-a-cross-platform-design-system): 60+ components mapped with full Code Connect coverage - [Migrating Questrade Edge Mobile to a Faster, More Scalable Architecture](/case-studies/migrating-questrade-edge-mobile-to-a-faster-more-scalable-architecture): 33% fewer re-renders across most features - [Enhancing Application's Performance for Expensify](/case-studies/enhancing-applications-performance-for-expensify): 5x faster message sending time **One codebase. No blind spots.** Every platform verified from a single QA flow, wired into your delivery. [Add QA agent](/contact) > Their engineers proved to be a crucial part of our mobile app relaunch project. > > — Brian Aznar, Engineering Director, Major League Soccer We’ll connect you with the right expert within 24 hours. ## Let’s find the right path for your product. **Which platforms are covered?** iOS, Android, web, and TV platforms (tvOS, Android TV), plus desktop where your product ships there. Coverage follows your actual release targets. **How is this different from our unit tests?** Unit tests verify logic in isolation. This verifies real behavior on real platforms - rendering, gestures, native integrations - where shared code diverges in practice. **Do we write a test per platform?** No. One plain-language spec runs everywhere. The agent handles platform differences in execution, and flags differences in outcome. **What about TV remotes and platform-specific input?** The agent drives platform-native input - remote navigation on TV, gestures on mobile, keyboard on web - as part of the same flow. **How does it integrate with CI?** As a standard check: PR-triggered runs post evidence and diffs into the pull request within minutes. **How do you handle flaky results?** Retries with evidence comparison, quarantine for unstable flows, and a deterministic suite for critical paths, so a flaky run never blocks a clean merge silently. ## Open source - [Agent Device](https://agent-device.dev/): CLI to control iOS and Android devices for AI agents - [React Native Testing Library](https://github.com/callstack/react-native-testing-library): Simple and complete React Native testing utilities that encourage good testing practices - [Reassure](https://github.com/callstack/reassure): Performance testing companion for React and React Native - [React Native Harness](https://github.com/callstackincubator/react-native-harness): Harness brings Jest-style tests to real native environments so you can test TurboModules like you would test your React Native app: with JavaScript. - [Rozenite](https://github.com/callstackincubator/rozenite): Plug-and-play panels for React Native DevTools. Install, enable, and start debugging in minutes.