LABO is an open sourced messenger platform made in Japan based on Blockchain technology of Ethereum network. It is also a social networking service without any vendor because of its P2P technology inside. About a decade passed since Blockchain technology practicalized, but it still not familiar to most people except IT engineers. LABO application has a solution to this problem. People uses only smartphone can access the Ethereum network and its Dapps easily and they can also chat one another, manage their crypto curencies, and pay for items.