The Vulyk application was initially created to help thousands of volunteers from NGO Kantseliarska Sotnia to decipher hundred of thousands of officials’ declarations. But because of its open license and simple architecture, it can be used for practically every task that requires crowdsourcing. We have successfully used Vulyk for NER annotation in BrUK corpus. The founders of Vulyk are Dmytro Chaplinskyi, Dmytro Hambal, and Volodymyr Hotsyk.