Other examples to think about:
• If an app supports podroll, is there a maximum limit?
• Is the tag searchable in the app?
• Are there known compatibility issues (such as artwork file size with Apple Podcasts)?
• Where does an app get the episode artwork? And in what fallback order (if any)?
The name and idea where inspired by caniuse.com and caniemail.com, the list of apps and tools will be _much_ longer, and I've decided to _not_ replicate their data structure in favor of maintainability.