prima
great
Colloquial for excellent, very good, or wonderful. The word is not declined.
Deine Idee, ins Kino zu gehen, finde ich prima!
I think your idea of going to the movies is great!

great
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great
Colloquial for excellent, very good, or wonderful. The word is not declined.
Deine Idee, ins Kino zu gehen, finde ich prima!
I think your idea of going to the movies is great!

'Prima' (great) is an adjective that is never declined. It always keeps the form 'prima', whether it stands alone, after a noun, or even before one.
Das Wetter ist prima.
The weather is great.
'Prima' (great) clearly belongs to colloquial language. It is used in everyday, informal conversations with friends, family, or colleagues, but generally not in formal written texts.
Dein neuer Haarschnitt sieht prima aus!
Your new haircut looks great!
'Prima!' (Great!) can also be used on its own as a short, positive answer or reaction, similar to 'Super!' or 'Toll!' (Great!).
„Ich komme um 18 Uhr vorbei.“ – „Prima!“
"I'll come by at 6 p.m." — "Great!"
super
'super' and 'prima' mean almost the same thing in many everyday situations: you think something is very good or you are satisfied. Both words are friendly and rather colloquial. 'super' is very common today and can also be used as an intensifier before an adjective, for example 'super nett' (super nice). 'prima' is more often used as a short positive evaluation, for example 'Das ist prima' (That is great), and it is not declined. They can be confused because both express praise. If you simply want to say 'very good', both often work.

Die Veranstaltung mit den Kindern hat prima geklappt.
The event with the children went really well.
David findet den neuen Plan super.
David thinks the new plan is super.