What is the difference between a Tanzania visa and Zanzibar visa?
Zanzibar is part of Tanzania. Therefore the same visa regulations and procedures apply so that Zanzibar does not have an eVisa, although citizens of several countries can acquire a Tanzania eVisa. This allows you to travel throughout Tanzania, including Zanzibar.
Tanzania's Electronic Visa, or eVisa, improves security and makes countrywide admittance easier. If you have an eVisa upon arrival, you will be able to pass through border control faster and easier than others who must wait in line to obtain a visa upon arrival.
If you are qualified and have the appropriate papers, you may apply for the Tanzania eVisa online before traveling to Zanzibar.