Use Firebase Test Lab to run test suites you already have (instrumentation, Robo or Game Loop) across a matrix of Android devices and get a report back. Use Mobilebox, cloud Android phones for AI agents at $0.01 a minute (ready for a first screenshot in 19.4 s in our November 2026 benchmark), when your AI agent needs a phone it drives itself, one observed screen and one action batch at a time, over MCP or REST.
Sources reviewed on November 8, 2026: Test Lab overview and Test Lab pricing. This is a comparison of what each product does, not a benchmark.
Measured timings: /benchmarks.
Who drives the phone
Test Lab starts a test, runs it to the end and reports. You hand it an APK and a test APK for instrumentation tests, or let its Robo crawler explore the app, from the Firebase console, the gcloud CLI or Android Studio. It runs on physical devices in a Google data center and on Google’s virtual test devices.
On Mobilebox the phone waits for your agent. The agent reads the screen as numbered elements, sends taps, typing and swipes, checks the new screen and decides the next step. Nothing runs unless your agent or your code asks for it, and the phone can stay for the next task.
Side by side
| Firebase Test Lab | Mobilebox | |
|---|---|---|
| Input | APK plus test APK, a Robo run or a Game Loop | Your agent’s tool calls, or REST |
| Output | Test results, logs, screenshots, video | The screen as text or a screenshot after every action |
| Devices | Physical devices and virtual test devices; iOS too | Cloud Android, iPhone and iPad, real Android devices |
| Agent connection | Not an agent interface | Hosted MCP server and REST API |
| Price | $5 an hour per physical device, $1 per virtual test device, per minute rounded up; free on Spark: 5 physical and 10 virtual test runs a day | $0.01 per cloud Android phone-minute, billed per second; iPhone $0.05, real Android $0.03 |
| Between runs | A new device per test | Park keeps apps, data and logins, free |
Use both
A common split: Test Lab runs the regression suite on every release across the devices your users have, and a coding agent uses a Mobilebox phone while it builds, to install the APK it just compiled, open the screen it changed and check the result before it opens a pull request. The Claude Code guide shows that loop with the tool calls, and the CI smoke test runs it from GitHub Actions.