lookalike product; similar product
Used especially in computing and business contexts for products that closely resemble another, often implying a copy or imitation.
This lookalike product imitates the design of a famous brand.
模倣品 explicitly means counterfeit or imitation goods, often with a negative connotation of illegality, while 類似製品 is a broader term for similar products that may not be illegal copies.
類似品 is a more general term for similar goods, not limited to computing or business contexts, and does not necessarily imply a copy of a specific product.
Compound of 類似 (るいじ, 'similarity') and 製品 (せいひん, 'manufactured product').