A Firebase Test Lab alternative for the other job: previews your agent can drive
Firebase Test Lab is a serious tool for a serious job — running Robo crawls and Espresso instrumented tests across Google's device matrix, inside your Firebase project. This page is for the people who land on it with a different job: you already have the build; you want to see it run, drive it, prove it works, and hand someone a link. For that job the matrix is the wrong shape and the wrong price. PreviewAPK is a cloud phone — yours, or your AI agent's — at a flat $25/month per device.
Try it with a live device
PreviewAPK is in private beta. Get early access to test your own builds.
When Test Lab is the right call
Plenty of times. If your work is Robo crawls and Espresso suites across a device matrix, automated runs inside a CI pipeline already tied to Firebase, and matrices with screenshots, video, and logs for a QA org — that's Test Lab's home turf, and it's good at it. Teams already deep in Google's ecosystem standardize on it for a reason: the matrix, the billing, and the Firebase project all live in the same account. Nothing on this page argues otherwise.
When a phone of your own fits better
Your tester is an AI agent
The fastest-growing testing workforce doesn't open test matrices. Agents need tools: push this build, tap that label, screenshot, read the log, hand over a link. PreviewAPK's MCP server gives an agent exactly those hands and senses on a real (virtual) device — it's the agent testing loop, productized. A matrix API can be bent into this shape; PreviewAPK starts there.
Watch live, don't just read matrices
A Robo crawl tells you the app didn't crash on 20 devices. It doesn't show you the onboarding flow, the animation, the thing your agent just fixed. Some verification only happens by looking: drive the phone, watch the screen, screenshot the result. That's the whole PreviewAPK loop — a phone you can watch instead of a matrix you can only read.
Flat beats metered
Per device-minute billing is rational for a matrix: you pay for the test minutes you consume. A preview phone shouldn't bill you for looking at it. $25/month per device, unlimited runs, and idle sessions auto-stop after 15 minutes — the session waits for you instead of the meter running.
Firebase Test Lab vs PreviewAPK, side by side
| Firebase Test Lab | PreviewAPK | |
|---|---|---|
| Built for | Teams running automated tests on Google's matrix | Builders and AI agents verifying builds |
| Device model | A matrix you schedule runs across | Your own device slot, always the same phone |
| Test style | Robo crawls / Espresso suites across a matrix | Direct driving: live taps, screenshots, logs |
| Agent access | APIs for launching test runs | 27 MCP tools + CLI + API, agent-first |
| Live interaction | Test runs, matrices, and reports | Live stream; you and your agent take turns driving |
| Handing over | Matrices, screenshots, and video | A permanent preview link per device |
| Pricing shape | Per device-minute, inside a Google Cloud project | Flat $25/mo per device, unlimited runs |
How PreviewAPK works
- Push a build — CLI, API, or an MCP tool call from your agent. The APK attaches to your device. Wire it into CI with the CI docs or the GitHub Actions preview flow.
- It boots in seconds on a cloud Android phone — a Pixel 9 Pro or Galaxy S24 running Android 10–15 — and streams to your browser. No SDK, no emulator, nothing to install, on either side.
- Drive it, or let your agent drive it — taps, typing, screenshots, UI hierarchy, and the session log, all through the same account. Idle sessions auto-stop after 15 minutes.
- Hand over the link — every device carries a permanent preview link for the human who needs to see it, the core of preview deployments for Android.
Priced flat at $25/month per device with unlimited runs. The agent guide and the docs cover the CLI, API, and MCP in full.
Keep going
Comparing the field? See the Sauce Labs alternative and the Kobiton alternative, the distribution side at Firebase App Distribution alternative, or the wedge itself: AI agent Android testing.
FAQ
What is the best alternative to Firebase Test Lab?
It depends on the job. For automated Robo or Espresso runs across a device matrix inside a Firebase project, Test Lab is the right category. For the build-preview loop — an AI agent (or a developer) pushing an APK, driving it, verifying the result, and handing a human a link — that's PreviewAPK: a cloud phone per device at a flat $25/month, with CLI, API, and MCP tools built for agents.
Does PreviewAPK run Robo tests like Firebase Test Lab?
No — and it doesn't pretend to. PreviewAPK isn't a matrix for running automated test crawls across a device fleet. It's one phone per slot, driven directly: by you in the portal, or by your agent through tools made for exactly that. The question changes from 'does the Robo crawl pass on 20 devices' to 'show me the build working.'
Can an AI agent use Firebase Test Lab?
Test Lab exposes APIs for launching test runs, which a determined engineer can wire to an agent — inside a Firebase project, with test matrices and billing to configure. But its product shape is a test matrix, not an agent toolset. PreviewAPK was designed agent-first: 27 MCP tools for pushing, driving, screenshotting, and reading logs, plus UI-hierarchy navigation so the agent taps by label, not by guessing pixels.
How does the pricing compare?
Test Lab bills per device-minute inside a Google Cloud project, so the meter runs with every test minute. PreviewAPK is a flat $25/month per device with unlimited runs — no meter running while you look at the screen, and idle sessions auto-stop after 15 minutes.
Is PreviewAPK affiliated with Google or Firebase?
No. PreviewAPK is an independent product. Firebase Test Lab is a trademark of Google; this page compares two tools for two jobs, nothing more.