What is the difference between pgAdmin and Postgres.app?

Question

After reading official websites as well as conducting Google research I still do not clearly understand how pgAdmin and Postgres.app relate to one another?

For example, I can simultaneously run two different local postgres servers on different ports from both pgAdmin and Postgres.app, which is confusing. I thought that those application depend on one another, but it does not seem so.

Answer 1

• Postgres.app is a full-featured PostgreSQL installation packaged as a standard Mac app. It sets up a PostgreSQL database server on your computer when you install it.
• PgAdmin is graphical user interface administration tool for PostgreSQL. It is a client tool for working with existing local or remote PostgreSQL servers. It does not include a PostgreSQL database server.