What are some similarities and differences between San Francisco and Seattle?

Question

I keep hearing about how San Francisco and Seattle are similar. I've been to both cities and get what people say. But what are your thoughts about how both cities compare to each other?

Answer 1

both are intellegent cities, the weather in SF is better, Sea is cleaner.
http://www.bayareavisit.com/other.html

Answer 2

I have been to Seattle several times and to San Francisco once. Similarities are that they're both in close proximity to the ocean, have hills and mountains within and outside the city, have a maritime climate, and are both beautiful cities.