Browser support
This is the clearest technical differentiator. Playwright supports Chromium, Firefox, and WebKit (Safari's engine) across Windows, macOS, and Linux. Cypress supports Chromium-based browsers and Firefox, but not WebKit — meaning Safari behaviour cannot be tested in Cypress.
For teams where Safari compatibility matters — typically B2C applications with significant iOS and macOS traffic — this alone is often decisive. Playwright is the only modern tool that can test WebKit behaviour in CI.
- Playwright: Chromium, Firefox, WebKit (Safari engine) — all platforms
- Cypress: Chromium, Firefox — no WebKit/Safari support
API design and test structure
Playwright uses standard async/await JavaScript and TypeScript. Engineers familiar with modern JavaScript can read Playwright tests without knowing the framework. The API is explicit — actions return promises, waits are standard JavaScript, and the test structure follows familiar patterns.
Cypress uses a custom command API with implicit chaining. Commands are queued rather than immediately executed, which makes the execution model different from standard JavaScript. This requires a learning curve and produces code that can confuse engineers expecting standard async behaviour.
Speed and parallelisation
Playwright is generally faster. It communicates directly with browsers via native protocols, supports true parallel test execution across multiple browsers simultaneously, and has lower per-action latency than Cypress.
Cypress offers parallelisation through Cypress Cloud (a paid service). Playwright's parallelisation is built in and free — you configure worker count in the config file and tests distribute automatically.
Community and ecosystem
Cypress has a larger established community and more third-party plugins. Playwright, backed by Microsoft, has grown rapidly and now has strong community support and an extensive plugin ecosystem of its own. For most testing needs, both have sufficient ecosystem coverage.
Playwright's official documentation is comprehensive and frequently cited as among the best in the testing ecosystem. Cypress has similarly strong documentation and a longer body of community tutorials and Stack Overflow answers.
Which to choose
Choose Playwright if: you need Safari/WebKit coverage, you want standard async/await without a custom API, you prefer built-in parallelisation without a paid service, or you want to use AI coding agents to write and maintain tests. Playwright's standard JavaScript API means AI-generated code is readable and maintainable — Cypress's custom API produces AI output that is harder to review.
Choose Cypress if: your team has significant existing Cypress investment, you primarily target Chromium and Firefox, you value Cypress's interactive test runner for development-time debugging, or your team finds the Cypress API more intuitive.
Where Assert fits
Assert is built on Playwright, so it inherits all of Playwright's browser support, speed, and reliability. The difference is in authoring: instead of writing Playwright test files directly, you define scenarios in plain-English Markdown and Assert generates the execution layer. This makes the authoring model accessible to the whole team and integrates naturally with AI coding agents.
FAQ
Is Playwright replacing Cypress?
Playwright has grown significantly in adoption and is now the more commonly recommended choice for new projects in many surveys and benchmarks. Cypress retains a large existing user base and continues to be actively maintained. Whether 'replacing' is the right word, Playwright is increasingly the default recommendation for teams starting from scratch.
Can I run both Playwright and Cypress in the same project?
Technically yes, but practically there is rarely a good reason to. The overhead of maintaining two different testing frameworks, two sets of configuration, and two sets of team knowledge usually outweighs any benefit.
Which is better for testing React/Next.js applications?
Both work well with React and Next.js. Playwright's support for testing across Chromium, Firefox, and WebKit is particularly useful for Next.js applications where Safari behaviour matters. For component testing specifically, both offer dedicated component testing features.
Put the workflow in your repo, not in a chat transcript
Assert is strongest when scenarios become durable project assets: readable Markdown in the repo, generated execution underneath, and result inspection in the dashboard.