ION (ION) is the coin of the blockchain and gaming platform ionomy. Right now, you can exchange and trade with ION, using the platform’s domestic solution. The ICO campaign was launched in 2016.
Siacoin is a utility token of the cloud storage platform called the Sia network. Sia is open-source and blockchain-based. The operations take place on Sia's own blockchain. The coin is used to pay for storage rent transactions. The coin is Proof-of-Work-based meaning that Siacoin can be mined. Another use for the coin is trading.