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.

pgAdmin doesn't start a server, it's only a "database viewer". Postgres.app is a server. — deceze, Sep 13 '17 at 09:20
please put some links to the documentation you have read about Postgres.app — Vao Tsun, Sep 13 '17 at 09:21

score 11 · Accepted Answer · answered Sep 13 '17 at 09:24

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.

What is the difference between pgAdmin and Postgres.app?

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