zkay is a programming language which enables automatic compilation of intuitive data privacy specifications to Ethereum smart contracts leveraging (homomorphic) encryption and non-interactive zero-knowledge (NIZK) proofs. This repository provides a toolchain for compiling, deploying and using zkay contracts. ZeeStar is also the upgraded version of zkay.
Why do you think that https://github.com/firoorg/firo is a good alternative to zkay