They share a lot of similarities. Both make it hard to do unsafe things, both have functional influences, both have modern features like closures, optionals etc

They share a lot of similarities. Both make it hard to do unsafe things, both have functional influences, both have modern features like closures, optionals etc. I'd say the biggest philosophical difference between the two is that Swift leans more toward developer ergonomics while rust is geared toward system level programming (ie tighter control over memory etc).