Aptos and Sui are two Layer-1 blockchains that originated from Facebook's discontinued Diem project. They share similarities in their Move programming language and focus on scalability, security, and decentralization, but have distinct approaches to achieving these goals.

*Aptos Overview*
Aptos is built by Aptos Labs, founded by former Diem engineers Mo Shaikh and Avery Ching. It utilizes the Move language for secure and efficient smart contract execution, with formal verification via the Move Prover. Aptos boasts sub-second transaction finality, low fees, and a modular architecture supporting seamless upgrades ¹.
*Sui Overview*
Sui is built by Mysten Labs, founded by former Diem engineers Evan Cheng, Sam Blackshear, Adeniyi Abiodun, Kostas Chalkias, and George Danezis. Sui utilizes a variant of the Move language called Sui Move, emphasizing simplicity in object state management for highly parallelized transaction execution ²