The working mechanism is similar. Both detect the sounds from a baby’s heart. However, there are still some differences. 1. Fetoscope is difficult for a mom to use by herself, but Stemoscope can be used by a mom since it is wireless and tubeless. 2. Stemoscope amplifies the sounds through advanced signal process while a fetoscope not, Stemoscope may detect weak sounds. 3. Stemoscope can record, visualize and share the sounds. 4. Fetoscope is normally a medical device, while Stemoscope not.