Mobile Testing MCPs Compared: Ceraph vs Argent vs Agent Device vs Mobile MCP
An AI coding agent should be able to do more than write your next screen. It should open the app, exercise the feature, catch the failure, and show you the result. Ceraph is built around that loop for React Native and Expo apps on iOS devices and simulators, plus Android devices and emulators.
It is not the only way to put an agent in control of an app. Software Mansion's Argent, Callstack's Agent Device, and Mobile Next's Mobile MCP all belong in the conversation. The useful comparison is not who has the longest tool list. It is how each tool helps you finish the feature you are building.
For a React Native or Expo builder, Ceraph's case is a focused workflow: get the app running, reach the right test state, exercise real UI flows, understand failures, and leave something a human can review.
The same jobs, different workflows
| Builder's job | Ceraph | Argent | Agent Device | Mobile MCP |
|---|---|---|---|---|
| Interact with the app | Tap, type, swipe, and navigate | Tap, type, swipe, and navigate | Tap, type, swipe, and navigate | Tap, type, swipe, and navigate |
| Understand the screen | App-aware structured snapshots, actionable references, optional live styles | Screenshots, native UI and React inspection | Accessibility snapshots and React DevTools inspection | Accessibility information and screenshots |
| Investigate a failure | React Native runtime errors in the agent conversation | Logs, JavaScript evaluation, debugging and profiling | Logs, crash context, debugging and profiling | Device interaction and inspection tools |
| Review the result | Verified replay into an MP4, UI snapshots, and screenshots | Recorded flows and screenshot-baseline comparisons | Record and replay workflows | Screenshots and screen recording |
These are workflow summaries, not an exhaustive feature inventory. The linked project documentation describes each tool's current coverage. Argent and Agent Device both offer React-specific inspection; the distinction is not that Ceraph is the only tool that understands React Native.
Start with the app, not the setup
The first useful test starts with an app your agent can actually use.
ceraph_start manages the path from a React Native or Expo project to a ready-to-test app, including the build, install, and launch work that is needed. For Expo development builds, that includes getting into your app beyond the dev-client launcher. When a prerequisite blocks progress, the agent gets a concrete next step.
Argent also documents building and launching apps. Ceraph's pitch is the complete daily workflow around your React Native project: start it, test the change, read the errors, and keep working in the same agent conversation.
Reach the state your feature needs
A tap is easy to ask for. Getting to the screen behind a particular subscription state, feature flag, or disposable test session is often the real work.
Ceraph's project-owned hooks let your agent use your app's own setup code to establish those prerequisites, then continue through the UI. Keep that setup pointed at disposable, non-production data. You decide what test state the project exposes.
Argent's JavaScript evaluation can also call app functions or change runtime values. Ceraph makes this a named, project-owned testing workflow: reusable setup for the states your app needs, alongside the interaction that verifies the feature.
The outcome matters more than the mechanism. Your agent can spend its effort testing the paywall, onboarding branch, or account state you asked about instead of repeatedly navigating back to its prerequisites.
Make camera flows repeatable
If your app captures a profile photo or scans a document, tapping the camera button is only the beginning of the test.
With Ceraph's supported Expo Camera integration, your agent can exercise camera flows using deterministic image and video fixtures in development. That gives you repeatable input for checking the app's capture, preview, and upload experience. Production builds continue to use the real camera.
This is the kind of app-building problem Ceraph is designed to make ordinary: give the flow a known input, check what the app does with it, and inspect the result.
Give the agent context, and give yourself evidence
Ceraph's structured snapshots give the agent actionable references for the current screen. Optional live style evidence helps it review supported elements after a visual change, and React Native runtime errors surface in the conversation while it works.
That keeps the task grounded in the running app: what is on screen, what failed, and what changed after the fix.
Once the agent has verified a path, ceraph_record_run replays it into a clean MP4 with UI snapshots and screenshots. You get a walkthrough to watch and evidence to inspect, useful for a pull request or your own review of the agent's work.
Argent offers recorded flows and visual-regression checks against screenshot baselines. Agent Device also offers record and replay workflows. Ceraph's emphasis here is reviewable evidence of the feature the agent just exercised: a video and the app states behind it. A walkthrough and an automated screenshot comparison answer different review questions.
Built around the work of shipping a React Native app
Automating testing is part of getting an app shipped. Ceraph stays focused on making that part of the job easier, from the first launch to the evidence you review before moving on.
For a React Native or Expo app, that is the reason to choose Ceraph. You get managed startup, recorded evidence, app-owned test setup, repeatable camera inputs, actionable screen context, and runtime errors in one focused workflow.
Try it on the feature you are building
Set up Ceraph in your project:
npx @ceraph/react-native-mcp@latest initThen ask your agent to open the app and test a real feature. Start with the flow you normally check by hand, the state that takes too long to reach, or the screen you want to see working before you ship.