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How Stably Works

As shown in the diagram, Stably is the AI layer for Playwright — combining a drop-in SDK that makes your end-to-end tests more capable, stable, and autonomous with optional reporter components for collecting test results and providing AI insights. On top of the powerful core, we offer both a web and CLI experience for creating, editing, and executing tests.
Stably is flexible! While we provide a powerful SDK at the core, writing code is optional.

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Why Stably?

  • More Coverage — test dynamic UX like charts, graphs, and canvases that static assertions miss.
  • Built to Scale — run and autofix hundreds of tests at once with parallel cloud browsers and agents.
  • Fewer Flakes — auto-heal and caching keep suites green and deterministic.
  • Faster Authoring — create tests faster with AI-assisted authoring and repair.
  • Edit Your Way — use our web editor, interactive CLI, or your favorite IDE.
  • No Limits — powered by real code, so you’re never constrained like other no-code platforms.
  • Native Git — built-in version control, not a workaround bolted on top.

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Trusted by Builders

Backed by Y Combinator and ▲ Vercel Ventures, Stably is used by hundreds of fast-growing teams.
The founding team previously built infrastructure at Google Chrome and Uber.

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