10 Best Browser DevTools Tools in 2026

Arc is a innovative web browser developed by The Browser Company that reimagines how users interact with tabs, bookmarks, and workspaces. Built on Chromium with native Swift development for macOS, Arc uses approximately 40% less RAM than Chrome while delivering smooth performance. Note: In May 2025, The Browser Company stopped active development of Arc to focus on Dia, their new AI-first browser. Arc continues to receive security updates but no new features. In September 2025, Atlassian acquired the company for million. Arc's Spaces feature enables powerful workspace organization for separating work, personal, and project contexts. The vertical sidebar, proactive tab management, split views, and customizable Boosts let users modify websites with custom themes and CSS. Little Arc provides a floating mini-browser for quick tasks without cluttering the main workspace.

Playwright MCP turns your AI assistant into a browser automation tool. Navigate pages, interact with elements, fill forms, take screenshots, and run end-to-end testing scenarios. Supports Chromium, Firefox, and WebKit. No API key needed — runs locally.

Playwright is an open-source end-to-end testing framework developed by Microsoft for testing modern web applications across all major browsers. It supports Chromium, WebKit, and Firefox with a single API, and runs on Windows, macOS, and Linux. Tests can be written in TypeScript, JavaScript, Python, .NET, or Java. Playwright features auto-waiting for elements, web-first assertions with automatic retries, and full test isolation via browser contexts. Its built-in tooling includes a test code generator, step-through debugger, trace viewer with DOM snapshots and screencasts, and an HTML reporter for analyzing results.

Jest is a delightful JavaScript testing framework focused on simplicity. Zero config for most JavaScript projects. Snapshot testing catches unintended UI changes. Powerful mocking capabilities for isolating tests. Watch mode re-runs tests on changes. The testing framework React teams trust for fast, reliable tests.

Burp Suite is what security professionals use to test web applications. Intercept HTTP traffic, scan for vulnerabilities, modify requests—find security issues before attackers do. The proxy captures everything between browser and server. The scanner automates common vulnerability checks. Manual testing tools enable deep exploration. Penetration testers and security researchers consider Burp Suite essential equipment for web application security assessment.

Testing Library tests components the way users interact with them. Query by role and text, not implementation—testing that encourages accessible code. The philosophy is sound. The queries are user-centric. The tests are meaningful. Frontend developers wanting tests that reflect user behavior use Testing Library.

Cypress is an open-source end-to-end testing framework built for modern web applications. Tests run directly inside the browser, providing real-time reloading, automatic waiting, and native access to the DOM, network layer, and browser APIs without external drivers like Selenium. Cypress supports E2E testing, component testing, and API testing with built-in assertions, screenshots, and video recording. Cypress Cloud extends the open-source runner with CI/CD parallelization, Test Replay for debugging failed runs, flake detection, and test analytics. The framework integrates with GitHub Actions, GitLab CI, CircleCI, Jenkins, and other CI providers. Used by over 1.5 million dependent repositories and downloaded 6M+ times weekly.

Jotai offers an atomic approach to global state management in React applications. It allows developers to build state by combining 'atoms,' which are fundamental units of state. This design automatically optimizes renders based on atom dependencies, effectively solving common issues like extra re-renders associated with React Context and reducing the need for manual memoization. Jotai provides a developer experience similar to signals while maintaining a declarative programming model. It's highly scalable, suitable for everything from simple `useState` replacements to complex enterprise-level TypeScript applications. The library includes various utilities and extensions to enhance its functionality and is trusted in production by innovative companies. It features a minimal, TypeScript-oriented API, making it as straightforward to use as React's `useState` hook, but with the added benefits of globally accessible state, easy implementation of derived state, and automatic elimination of unnecessary re-renders. Jotai also supports server-side rendering with frameworks like Next.js and Waku.

Vitest is a blazing fast unit test framework powered by Vite. Compatible with Jest's API for easy migration. Instant watch mode with hot module replacement. Native TypeScript and ESM support. Component testing for Vue, React, and more. The next-generation test runner built for modern JavaScript.

StackBlitz provides instant dev environments in browser. Cloud IDE that starts instantly—development without waiting for setup. The startup is instant. The editing is real. The sharing enables collaboration. Developers wanting instant environments use StackBlitz for browser-based development.