Nibbler - Free tool for testing how good your website is, and what you can do to improve it. Check accessibility, SEO, social media, compliance and more.

accessiBe - Making websites accessible to people with disabilities

LERA by AdvancedBytez - An intelligent accessibility reporting experience. Automate accessibility reports for automated testing results.

Sim Daltonism - From the perspective of a color blind person, some colors are impossible to distinguish.

Adobe Spark Post - Adobe Spark Post is the fun and fast way to create stunning graphics for all occasions.

Coblis - If you are not suffering from a color vision deficiency it is very hard to imagine how it looks...