Cost / License
- Free
- Open Source
Platforms
- Mac
Apps similar to Kasasa include LayerX, which is free and open source. Other options are PixelPerfect, Overlay2, CThruView Transparent Image Viewer and Overlay. In total there are seven Image Viewers like Kasasa for Mac, Windows, Linux and the web.
Allows developers to put a semi-transparent image overlay over the top of the developed HTML and perform per pixel comparison between them. Works with DevTools and Firebug.



Overlay2 is like digital tracing paper for your computer. It opens a semi-transparent floating image over video capture or editing software, or 3D modelling software, so you can use the image as a reference or positioning guide.



CThruView is a free transparent image viewer that allows mouse clicks to go through the image. This makes your image see through and click through, so use it as tracing paper, splash screen or watermark.

A frame that allows you to have an image or even PDF displayed semi-transparently in front of everything. It enables you to copy, trace, or compare designs, images, and documents with ease, since you can lock the frame and make it undisturbed by mouse gestures.



Turn any mockup into a floating guide, and visually align pixels with ease.
Use GluePrint to implement your interfaces pixel perfect. Simply open a mockup and lock it on top of your work to see how it compares. Position with the arrow keys and scroll to adjust the transparency. .



Capture any part of your screen and turn it into a floating card. On-device OCR, scroll capture, dock-to-edge gestures. Runs entirely on your Mac.
