The best alternatives to Contrast Safe are Contrast, Shade, and ColorSnapper. If these 3 options don't work for you, we've listed a few more alternatives below.
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Low contrast text is the most common accessibility issue and affects 86.4% of pages. This free extension based on technology developed for Polypane (https://polypane.app) automatically fixes contrast issues on any site you visit.
Chameleon is a macOS app that gives quick access to changing the interface, accent and highlight colors from the menu bar. It has a very simple interface, if you've used the System Preferences panel to make any changes then it should look really familiar.
Colors are represented in various ways in different languages. For example, RGBA can be encoded as either RGBA or ARGB, each channel can be stored as Integer or Double. This utility hides the details from you by converting colors to code snippets.