是 和Sketch的测量和设计规范 /扩展。它是为现代网页设计师和应用程序前端开发人员制作的。您可以通过单击并拖动来添加规范标记。坐标，尺寸，距离或字体，无论您想要什么或何地。
Markly for Mac 1.8.2 介绍
Markly is a measurement and design-spec plugin/extension forand Sketch. It is made for modern Web designers and app front-end developers. You can add specification marks simply by clicking-and-dragging. Coordinates, dimensions, distance, or fonts, no matter what or where you want.
- Super Easy and Fast - Without Markly, you have to spend time applying styles to each individual specification element. Even if you create a list of styles in your layer settings--styles which execute an intricate set of steps--you will soon find the design difficult to maintain.
- Highly Maintainable - The efficiently organized measurements data are saved in the metadata of your file, ensuring high maintainability and portability.
- Smart Measure - Mobile developers don't use pixels (px) as Web developers do. Markly can automatically convert those measurements based on differing screen densities.
- Update Automatically - If you create specifications directly on your layers, once you modify your design, you have to modify the marks one-by-one according to the changes. You don't have to do this with Markly. Markly will update your specs automatically when you modify your design in or Sketch.