Hitoribocchi no Isekai Kouryaku

Both are light isekai titles where whole class is transferred into another world. In both animes main character is alone from the very start but even so he somehow manages to deal with reality. Both animes have also some sort of harem. 

Both are based on theme of getting transferred into isekai with a whole class. Both main chracters have to struggle alone from start and both have their goals that are different from the rest of the class. Though when Hitoribocchi is rather light production, Kumo desu ga tends to be more serious and "intense". In Kumo desu ga we have also explanation of being isekaied when in Hitoribocchi this thread isn't actually developed and it doesn't matter. In general Kumo desu ga is more engaging and it isn't light comedy like Hitoribocchi  

Both shows are about a class of students going to another world. Main characters got ''trash'' skills but grow more powerful than the others quite fast. Both shows got the classic RPG stuff like skills, levels etc.