A product and an infrastructure
are different purchases.
TestMu AI is a testing cloud, with browser grids, device farms, and orchestration. It runs the tests your org already maintains. Beryl is the product that makes those tests exist. They are written, run, and repaired by the AI coding assistant you already use. One solves your testing problem; the other assumes you've already solved it.
TestMu AI is a testing cloud. It runs the tests your org already maintains. Beryl is the product that makes the tests exist, written, run, and repaired by the AI coding assistant you already use.
Where they differ
| Beryl | TestMu AI | |
|---|---|---|
| What it is | A testing service. Beryl's cloud agent writes the tests from a document you give it, then Beryl runs and repairs them | A testing cloud that runs your tests at scale across browsers, OSes, and real devices |
| Who writes the tests | Beryl's cloud agent, from a plain-English document describing the flows | Your QA team, in its own framework. KaneAI can draft a test, but the code stays yours to maintain |
| Test framework | Managed. Tests become Playwright tests; export the files any time | Bring your own Selenium, Playwright, Cypress, or Appium suite |
| Test accounts | Created automatically, or bring your own. Signed in once per run and reused everywhere | You create or provide the test accounts manually |
| OTP, 2FA & login links | Built in. Each project has its own inbox, so OTP, two-factor, and magic-link flows just work; password credentials supported too | Not covered. Inboxes, codes, and links are your test code's problem |
| What a test looks like | Plain JSON your coding agent can read, diff, and fix over the MCP and CLI; every change is proved with a replay before it saves | Framework code in your repo; the grid runs what you bring |
| When the UI changes | Cosmetic drift and flaky tests repair themselves; real breaks stay red | KaneAI helps write tests; repairing them stays with your team |
| CI integration | One command runs tests against a preview URL; pass or fail is the exit code | CI plugins; HyperExecute orchestration for large parallel suites |
TestMu AI capabilities summarized from testmuai.com (formerly lambdatest.com) as of August 2026. Verify current capabilities with the vendor.
Why teams start with Beryl
- Tests start as plain English. Describe the flows in a document and Beryl's cloud agent authors a test for each one
- Runs happen in real Chrome in Beryl's cloud, triggered from your agent, a schedule, or CI
- Logins, email codes, and login links are handled by a built-in test account and inbox
- Daily or weekly runs per environment, with Slack alerts when something fails
- When the UI drifts, cosmetic breaks are repaired and real breaks are flagged
- Screenshots, traces, and replays for every run, shared with the whole team
- Every test stays a normal Playwright file; export any time
Common questions
Is Beryl a LambdaTest (TestMu AI) alternative?
They solve different layers. TestMu AI is testing infrastructure: browser grids, device farms, and orchestration for the suite you maintain. Beryl is a testing product: your coding assistant writes the tests, Beryl runs and repairs them.
Who writes and maintains the tests?
With Beryl, its cloud agent writes them from a plain-English document you provide, and Beryl heals cosmetic breaks. KaneAI can draft a test on TestMu AI, but the code and its upkeep stay with your team.
What framework do Beryl tests use?
Playwright. Tests become standard Playwright files you can export any time. TestMu AI runs the Selenium, Playwright, Cypress, or Appium suite you bring.
How are logins, OTP codes, and magic links handled?
Built in. Beryl creates durable test accounts and gives each project its own inbox, so verification flows run without a human. On TestMu AI, inboxes, codes, and links are your test code's problem.
Can my coding agent stay in the loop?
Yes. Every Beryl command is an MCP tool, so the agent you already use creates tests from a document, triggers cloud runs, reads failures, and fixes a test's plain-JSON plan, with every fix proved by a replay before it saves. TestMu AI is driven by your framework and CI plugins.