The device is an image based cell counter.
The cell counter takes a photo, this photo is sent to the cloud. The picture is analyzed by image analysis software in the cloud. Results are then presented to the user in the app and logged in the cloud.
The cell counting algorithm has been trained over time and analyzes variables (different characteristics of what a cell should look like) and then decides what is right or wrong. The cloud platform allows far more 'features' to be processed than traditional cell counters, in a much shorter period of time.