Cucumber vs Nightwatch.js

Free tier available

Free and open source

Open source core. SmartBear sells CucumberStudio for collaborative scenario authoring, priced per user on request.

Free and open source. You pay in engineering time and CI minutes.

The Cucumber libraries are open source and free.

Everything, self-hosted

Widely used

Smartbear · since 2008

Established

BrowserStack · since 2014

• Shared vocabulary between product, QA and engineering when the practice is actually followed.
• Scenarios double as living documentation that stays honest because it executes.
• Available in every major language.

• Everything included: runner, assertions, page objects, reporting, parallelism.
• Very readable chained syntax that non-specialists pick up quickly.
• Tight BrowserStack integration if you already use that cloud.

• Almost always adopted as a syntax rather than a collaboration practice, at which point it is pure overhead on top of your real tests.
• The step-definition layer is a second codebase to maintain and refactor.
• Gherkin obscures technical detail that developers need when a test fails.

• Community is a fraction of Playwright's or Cypress's; fewer answers exist for edge cases.
• WebDriver-based, so it carries the usual latency and waiting caveats.
• Corporate stewardship by a device-cloud vendor is worth weighing if you plan to use a competitor.

Teams genuinely practising BDD with three-amigos sessions, not teams who just want prettier test names.

Teams already on BrowserStack who want an integrated JavaScript framework.