Well mate, the two tokens are really different to each other. Security tokens are crypto tokens issued to investors in a token sale or ICO for the exchange of their money. Crypto tokens that pay dividends, share profits, pay interest or invest in other tokens or assets to generate profits for the token holders are deemed as ‘security tokens’. While Utility tokens are also called app coins or app tokens. It is so because utility tokens ought to have some utility in the decentralized application that a team is building and raising ICO for.