Kandou Kizoku na Ore no Kuzu Gift ga Tsuyosugiru!

Ryuk, a young man adopted into a noble family, receives a mysterious item called a "smartphone" during a once-in-a-lifetime ceremony where he is granted a gift by a god. Not knowing how to use it, Ryuk is treated as useless and disowned by his adoptive father. However, this smartphone is actually an extraordinary, super-powerful gift capable of anything from appraisal and ability copying to item duplication and equipment synthesis...!! With this immense power, Ryuk aims to become the strongest adventurer who can protect himself and others! A super-fast rise-to-power fantasy with a cheat item begins!

(Source: AlphaPolis, translated)