Google Chrome Developer Tools - Get started with Google Chrome's built-in web developer tools.
Instabug - The top apps in the world rely on Instabug for beta testing, user engagement and crash reporting.
Code Cola - Code Cola is a chrome extension to editor online pages' style visibility.
Bird Eats Bug - Saw a bug? Send an instant replay to engineers. It will come with console logs and everything. Developers will ❤️ you.
Fiddler - Fiddler is a debugging program for websites.
Sentry.io - From error tracking to performance monitoring, developers can see what actually matters, solve quicker, and learn continuously about their applications - from the frontend to the backend.