user
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user
A person who uses or makes use of something, especially a service, product, or technical system such as software or a website.
Die App hat bereits über eine Million aktive Nutzer.
The app already has over one million active users.
'Der Nutzer' (the user) belongs to the word family of the verb 'nutzen' (to use). A 'Nutzer' is therefore a person who uses something. The noun 'die Nutzung' (the use/usage of something) also belongs to this word family.
Jeder neue Nutzer muss die allgemeinen Geschäftsbedingungen akzeptieren.
Every new user must accept the general terms and conditions.
'Nutzer' is a noun of the N-declension. This means it takes the ending '-n' in all cases except the nominative singular. Learners often forget this.
Der Administrator hilft dem neuen Nutzer bei der Anmeldung.
The administrator helps the new user with the login.
The word 'Nutzer' (user) is very often used in connection with digital media and technology. Typical combinations are 'Nutzer einer App' (user of an app), 'Nutzer einer Website' (user of a website), or 'Nutzer eines sozialen Netzwerks' (user of a social network).
Als registrierter Nutzer haben Sie mehr Funktionen zur Verfügung.
As a registered user, you have more features available.
customer
'Kunde' and 'Nutzer' can both refer to a person who makes use of an offer or service. 'Kunde' is especially appropriate when someone buys something or pays for a service. 'Nutzer', on the other hand, emphasizes that someone uses something, especially an app, a website, a device, or a service. The words can overlap, for example with paid software: one person can be both a Kunde and a Nutzer. If the purchase is important, you are more likely to say 'Kunde'. If the use is important, you are more likely to say 'Nutzer'.
Viele Nutzer haben in der App ein neues Passwort gespeichert.
Many users have saved a new password in the app.
Der Kunde bezahlt an der Kasse und nimmt die Ware mit.
The customer pays at the checkout and takes the goods with him.