beryl vs testmu ai (formerly LambdaTest)A product and an infrastructure
A product and an infrastructure
are different purchases.
TestMu AI is a testing cloud — browser grids, device farms, orchestration — it runs the tests your org already maintains. Beryl is the product that makes those tests exist: 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
Primary job
Beryl
Get tests written, run, and repaired from the AI coding assistant you already use
TestMu AI
Run tests at scale across browsers, OSes, and real devices
Who writes the tests
Beryl
Your coding assistant — it clicks through your app in a live browser and writes each test as a step-by-step plan
TestMu AI
Your QA team in its own framework, or KaneAI plain-English authoring
Test framework
Beryl
Managed — tests become Playwright tests; export the files any time
TestMu AI
Bring your own — Selenium, Playwright, Cypress, Appium run on the grid
Browsers
Beryl
Chrome (Chromium), managed — depth over breadth
TestMu AI
3,000+ browser/OS combinations, including legacy browsers
Mobile & devices
Beryl
Web apps only — that's the focus
TestMu AI
10,000+ real iOS and Android devices in the cloud
Running on your machine
Beryl
Tests run on your laptop; results sync alongside cloud runs
TestMu AI
A tunnel connects the grid to localhost — execution stays in their cloud
Email codes & login links
Beryl
Built in — each project has its own inbox; tests read codes, follow links, sign up fresh
TestMu AI
Handled in your own test code
When the UI changes
Beryl
Beryl repairs tests broken by cosmetic changes (a moved or renamed button); a genuine break stays red and is flagged as such
TestMu AI
KaneAI assists authoring; the framework code remains yours to maintain
Visual checks
Beryl
On every failure — screenshots, snapshots, traces, a video-like replay
TestMu AI
SmartUI — pixel comparison against approved screenshots
Scheduling & alerts
Beryl
Daily or weekly runs per environment; Slack alerts on failures
TestMu AI
Scheduled runs; 120+ integrations including Slack and Jira
CI integration
Beryl
One command runs tests against a preview URL; pass/fail is the exit code
TestMu AI
CI plugins; HyperExecute orchestration for large parallel suites
Buyer
Beryl
Product engineers who want testing handled without a QA department
TestMu AI
QA teams that need device coverage and execution scale
| Beryl | TestMu AI | |
|---|---|---|
| Primary job | Get tests written, run, and repaired from the AI coding assistant you already use | Run tests at scale across browsers, OSes, and real devices |
| Who writes the tests | Your coding assistant — it clicks through your app in a live browser and writes each test as a step-by-step plan | Your QA team in its own framework, or KaneAI plain-English authoring |
| Test framework | Managed — tests become Playwright tests; export the files any time | Bring your own — Selenium, Playwright, Cypress, Appium run on the grid |
| Browsers | Chrome (Chromium), managed — depth over breadth | 3,000+ browser/OS combinations, including legacy browsers |
| Mobile & devices | Web apps only — that's the focus | 10,000+ real iOS and Android devices in the cloud |
| Running on your machine | Tests run on your laptop; results sync alongside cloud runs | A tunnel connects the grid to localhost — execution stays in their cloud |
| Email codes & login links | Built in — each project has its own inbox; tests read codes, follow links, sign up fresh | Handled in your own test code |
| When the UI changes | Beryl repairs tests broken by cosmetic changes (a moved or renamed button); a genuine break stays red and is flagged as such | KaneAI assists authoring; the framework code remains yours to maintain |
| Visual checks | On every failure — screenshots, snapshots, traces, a video-like replay | SmartUI — pixel comparison against approved screenshots |
| Scheduling & alerts | Daily or weekly runs per environment; Slack alerts on failures | Scheduled runs; 120+ integrations including Slack and Jira |
| CI integration | One command runs tests against a preview URL; pass/fail is the exit code | CI plugins; HyperExecute orchestration for large parallel suites |
| Buyer | Product engineers who want testing handled without a QA department | QA teams that need device coverage and execution scale |
Why teams start with Beryl
With Beryl
- No browser tests yet, and no wish to build a QA function
- You live in Claude Code or Cursor and want testing in that loop
- Sign-up, email-code, and login flows are what you need covered
- You'd rather own zero test code — Playwright export is the way out
Where TestMu still fits
- A large Selenium/Cypress/Playwright suite needs somewhere to run
- Cross-browser and real-device coverage is a requirement
- A dedicated QA org wants infrastructure built for its scale
TestMu AI capabilities summarized from testmuai.com (formerly lambdatest.com) as of August 2026 — verify current capabilities with the vendor. The two can coexist: Beryl-exported Playwright tests are standard files.