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Abstract: Liquefied Petroleum Gas (LPG) known as “cylinder gas” is one source of energy used for cooking, heating and etc.. LPG gas consist propane and butane gas. Although its characteristic is odorless in natural state but it is a flammable gas that can cause fire incident to occurs. Conventionally, the gas leakage can be easily be detecting through their smells because it consists a mixture of an Ethyl Mercaptan odorant. Thus, the paper develops LPG gas leakage detector with Blynk IOT-based. MQ2 gas sensor are used in detecting the present of gas. Notification warning automatically sent through user smartphone using Blynk app through their mobile phone if leaking occurs. The detector is tested in two condition state which are in airtight room with no air flow or fan and open room with window open. The time taken for detector to react and message receives in term of distance with the flame variation. Then,the analysis was made based on their condition state.