This Health Assessment Tool does exactly what is says, it will assess the health of a plant you give it by submitting it to the Health Assessment API. It can provide you with possible reasons why your plant could be unhealthy. One thing I like about this health assessment tool is that it also includes a probability in its answer. This allows me to see how confident the API is with its answer. If the probability isn't to your liking, you can use your own judgment and disregard or regard its answer.