Why accuracy claims can't be trusted
Every dupe house claims 90% accuracy. They are not all telling the truth. The phrase is marketing, not measurement — there is no industry standard, no third-party testing, and no agreed methodology.
The only reliable signal is independent blind comparison from people who own both bottles.
Three questions that filter the noise
1. Did anyone compare them side by side?
Reddit threads are gold when commenters explicitly say "I have both." Everything else — "smells just like it" from someone who smelled the original once at Sephora — is low-signal.
2. What do the longevity reports say?
Dupes almost always lose ground on longevity before they lose it on accuracy. A dupe that "smells identical for the first hour" and then disappears is a different product than the original, even if the opening is perfect.
3. Does the review mention batches?
High-quality dupe discussion references batch numbers and purchase dates. Low-quality reviews don't. This matters because many dupe houses reformulate silently.
Red flags in marketing copy
- "Inspired by" with no reference to the original name
- Stock images of the original bottle next to the dupe
- Claims of "better than the original"
- Missing note pyramids or ingredient lists
What to look for instead
The best dupe houses publish honest accuracy notes, acknowledge where their version diverges, and list the inspiration fragrance by name. Dossier and ALT are the current gold standard for transparency. Armaf and Lattafa produce excellent dupes but lean harder on "inspired by" phrasing.
When in doubt, read three Reddit threads before you buy. Twenty minutes of reading saves you $40 on a bottle you'll never reach for.