Welcome to use Markly!
We build Markly to improve our workflow originally. After we attempted to introduce it to some designers, we found that there are so many folks who love Markly. Then we decided to start our business from it.
Markly PS is a Photoshop plugin/extension, which allows web or mobile designers to create design specs quickly and easily. In comparison with manual measurements and traditional plugins on the market, Markly is completely new and different. We didn't follow anyone.
However, after the PS version was released, we received a lot of feature requests about Sketch version (a native Mac app), so we made it compatible with Sketch 1 month later. It's definitely true that making a great product is so hard.
If you need help, please feel free to contact us.