App to store customers information, like 2nd phone book?

Hello,

Thanks to all for many useful information; I check this forum monthly as guest but this is the first time I search for a specific app and need some help.

Can you please suggest me an app where I can write (store) my costumers data (information)?
Like this would be some kind of notes, 2nd phone book or preferably database.
I only need to store very simple information: name, last name, address, phone number, e-mail and short memo for example: how costumer looks like, what she/he...

App to store customers information, like 2nd phone book?

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