Two years ago I worked as a developer/ui/ux designer for a closed source Android app during my summer as a research assistant. The app in question is called “Vital Sign” and would help doctors and nurses to monitor patient vitals with the aid of a portal device. I based my design mostly on Window flat retro design at the time. Today, I was reading through my daily Apple news and saw that Apple released their own version of health app. And strangely, they are using a few icon designs that are very similar to mine. See it for yourself, the three in questions are vitals, blood pressure, and oxygen.
That leaves me with only one question in mind, can I ask Apple for royalties on the icon design?