JustinMind is useful for developers to inspect a project. It is possible to see every detail of pixels and sizes in a very friendly way. It's an excellent desktop application, and although not as well known as Adobe XD or Sketch, it's fairly easy to use. It enables the fast creation of clickable wireframes and high-fidelity prototypes. It's very good for web and mobile apps: https://www.justinmind.com/:
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