Probei

Probei is a visual QA agent that tests a web app the way a real user does. Automated UI tests break on every redesign: rename a class or move a button and a hundred tests go red while the product still works. Probei has no selectors, so there is nothing to break. How it works: you write a scenario in plain English (what to do and what should happen). Probei opens the app in a browser and takes a screenshot; Muse Spark looks at the screenshot and the history and returns one action (click, type, press a key, scroll or wait); Playwright performs it; the loop repeats until the scenario passes, a bug is found, or the agent gets stuck. The result is a bug report with steps to reproduce, screenshots, page errors and a video of the run (model thinking time is cut out, so a run plays in seconds). Features: auto-review that crawls the app and drafts test scenarios; a web UI with projects, saved scenarios, a run-all queue and run history; one-click export of a bug report to a GitHub issue; deploy watch that can rerun all tests after a new deploy; voice input for scenarios; and a CLI for scripts and CI. Results: we built a demo shop with planted bugs and a ground-truth file the agent never sees. Probei found 2 of 3 bugs with zero false alarms, at about 40 seconds per scenario. Then we fully restyled the shop (new layout, theme, DOM and class names). A classic selector-based Playwright check went from PASS to FAIL, while Probei ran the same scenarios unchanged and still found bugs. Small sample, so scores vary between runs. Stack: TypeScript, Playwright, Muse Spark via the Meta Model API or Baseten (open weights).