This app does work on Kindle Fire but you need to search Google for the voice search apk file. One of the other reviews mentions the exact file name. As to this app it’s fun but needs work. Someone else already gave a good overview so I’ll just say that the most glaring flaw is the apps ability to understand you. It will often put the wrong word if you say something too fast or not clear enough. If you don’t continue talking after a certain amount of time it stops recording even if you’re not done. Mainly though it’s like auto correct but it’s listening to you talk instead of type. I think someone who speaks with a heavy accent would find this app hard to use. Although it’s really fun to speak fake words and gibberish and see what real words it chooses. It can only put real words. It won’t put exactly what you say. So if you start talking about Harry Potter and use some of those unique words from those books and movies it won’t be able to. It will put what real words match most closely by how it sounds.