I used a Cherry Red keyboard in an office for a while. It was pretty noticeable for most people around me. The benchmark for keyboard loudness in my experience

I used a Cherry Red keyboard in an office for a while. It was pretty noticeable for most people around me. The benchmark for keyboard loudness in my experience is the standard apple laptop keyboard noise or the standard apple USB keyboard noise. It seems like all mechanical keyboard switches tend to be louder than those, and will be noticed. It's possible though that depending on how you type, people won't care. I spend a lot of time writing text and type quickly and with force, so people could really hear it when I got going on my keyboard.