Mantis Shrimp 4+

Mantis Shrimp is an image comparison tool written with the MetalSDK.

Features:

* It's a document application, so you can save your projects and open multiple windows.
* It supports any types of images supported by macOS. That includes JPEG, PNG, HEIC, HDR, EXR, and others.
* It supports automatic linear RGB conversions.
* It supports multiple color spaces, including display-P3 (DCI-P3).
* It comes with multiple presets to compare color channels in different ways.
* It lets you write and use your custom shaders, using Metal shading language. These can be fragment or mesh shaders.
* Shaders come with some predefined functions and variables, including time, so you can use this as a shader sandbox, or "shader toy".
* The editor has some basic cpp-based syntax highlighting, with some Metal keywords.

Check the manual in the support URL for usage instructions and examples.