Some South Korean app developers have accused internet giant Naver and Japanese subsidiary Line of plagiarism, saying the companies copied their user interface designs.

Carrot Market, an app used for buying and selling secondhand items, said Line introduced a similar app in Vietnam last year and plagiarized Carrot Market’s design and features.

Line’s Get It app is “extremely similar” to Carrot Market in terms of everything from the main display to the identification methods, the local company said.

“Ranging from profile displays to product reviews, (Line’s designs) are exactly the same as ours,” Carrot Market CEO Kim Jae-hyun said on Facebook, where he posted several images of Carrot Market and Get It side by side.