Shoushimin Series

Both shows have very similar atmosphere, because they're made by the same author, Honobu Yonezawa. If you like one of these and are into mystery and slice-of-life, you'll definitely enjoy the other one. 

Similarities: 1. Same author: Honobu Yonezawa 2. Mysteries around their everyday life 3. Heavy dialogue between two protagonists Differences: 1. Hyouka exaggerates scenes while Shoushimin doesn't. 2. For the female characters: Osanai is cunning and Chitanda is carefree and always curious. (You might have heard the phrase "Kininarimasu" or "I'm curious.") 3. Kobato and Osanai doesn't have any romantic feelings to each other and it was stated several times throughout the season, Chitanda and Oreki might have a few scenes but it's not official. Both shows revolve around two protagonists solving various mysteries centered around their high school lives, combined with stellar animation. Although, it is written by the same author, the key difference here is that Shoushimin is more mundane than Hyouka. read more 

Both shows are school-based mystery shows, with pretty animation and quiet characters. 

They both have mystery elements in them with the protagonist trying to solve them with their recreations of the events on their minds. They are both dialogue-heavy so you will have to pay attention to understand what is going on.