100均ラボ is a Japanese website that helps shoppers discover and compare products sold by discount and variety-store chains, including Daiso, Seria, Can Do, Watts, and 3COINS. Rather than selling products, it brings together reviews and practical shopping information from people who have purchased and used the items. Product pages and listings feature user-submitted photos, ratings, comments, purchase locations, and, where available, photographs of store shelves and the date they were checked.

The site covers a wide range of categories, from storage, stationery, kitchenware, and cleaning supplies to food, cosmetics, healthcare items, and seasonal goods. Its guides explain where products may be found and offer comparisons, selection advice, and usage ideas. Shoppers can browse by store, category, purpose, popularity, or review rating, and can contribute reviews; membership is required for some features, such as managing drafts and submitting shelf photos. 100均ラボ also publishes shopping features and recommendations based on user feedback. Shelf photos record conditions at the time taken and do not guarantee current availability.