Imaginary Authors O, Unknown!: released in 2017, powdery, iris and woody, about 5h on skin, projection 7/10, sillage 3/10. The alternatives below are matched to that profile.
The closest Imaginary Authors O, Unknown! dupe we found is Marissa Zappas Petrichor — 77% match, about $80 (estimate) versus about $95 for a 100 ml bottle.
The closest scent match — the best Imaginary Authors O, Unknown! dupe we found, ranked by opening & dry-down similarity:
| # | Alternative | Scent match | Est. price (100 ml) | Longevity vs Imaginary Authors O, Unknown! | Projection |
|---|---|---|---|---|---|
| 1 | Marissa Zappas Petrichor | 77% | about $80 (−16%) | 5h vs 5h | 5/10 |
Captures the earthy, green, and atmospheric mood of O, Unknown! through damp botanical impressions.
It shares its earthy, woody and iris accords with Imaginary Authors O, Unknown!, lasts about 5h against 5h and carries 196 community ratings.
Marissa Zappas Petrichor, at about $80 for 100 ml (estimate) — around 15% less than Imaginary Authors O, Unknown!.
Marissa Zappas Petrichor, at about 5h on skin, against about 5h for Imaginary Authors O, Unknown!.
Marissa Zappas Petrichor, at 77% overall scent match across the opening and the dry-down.
Imaginary Authors O, Unknown! itself sells from €99 (50 ml) at partnered retailers.
At 4 sprays a day — about 146 ml a year — Marissa Zappas Petrichor saves you about $20 a year against Imaginary Authors O, Unknown!. Assumes 100 ml bottles on both sides; prices are estimates.
Across 2,358 originals, the median designer bottle is $120 and its closest match $30 — the Dupe Report 2026.
On an 8-hour day, none of the 1 last a full 8 hours. Marissa Zappas Petrichor comes closest at 4.8h, so it needs one re-spray to cover the day.
Imaginary Authors O, Unknown! notes, performance and price
AltScent is also free on the App Store and Google Play.
Updated 2026-09-19.