Similarity is based on note and accord overlap, not molecular analysis.
Differences come from accords and community votes on longevity and sillage.
The main accords of Yves Saint Laurent Y are fresh spicy and aromatic. It opens with Bergamot and Aldehydes, reveals Apple and Violet Leaf at its heart, and dries down to Ambergris and Musk. It lasts a moderate time and projects moderately; people reach for it in spring and summer, mostly by day.
How a perfume unfolds →