How to Say "complementary" in Spanish
The Spanish word for “complementary” is “complementario” — B1 level. This is a very common word in everyday Spanish.

Examples
El curso incluye material complementario para estudiar en casa.
The course includes supplementary material for studying at home.
El azul y el naranja son colores complementarios.
Blue and orange are complementary colors.
Sus habilidades son complementarias y hacen un gran equipo.
Their skills are complementary and they make a great team.
Matching the Word Ending
Since this word is an adjective, you must change the ending to match what you are describing: 'complementario' for masculine singular, 'complementaria' for feminine singular, 'complementarios' for masculine plural, and 'complementarias' for feminine plural.
Where to Put It
In Spanish, you usually place this word after the person or thing you are describing. For example: 'un seguro complementario' (a supplementary insurance).
The 'Free' Trap
Mistake: “Using 'complementario' to mean a free gift or service.”
Correction: In English, 'complimentary' can mean 'free.' In Spanish, 'complementario' ONLY means 'completing' or 'extra.' For a free item, use 'gratis' or 'de cortesía'.
Related Translations
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