The abdomen looks more white than in this picture. It was in the kitchen and I caught it by putting a glass over it. It is about the length of my pinky fingernail.
Hi, this is a male Yellow Sac Spider in genus Cheiracanthum. They range in color- yellow, white, gray, or greenish. You used the best humane method to catch it. They are found both indoors and out. The black feet on it are a way to tell it apart from the other pale prowling spiders.