Verdict: K18 4 Minute Leave-In Molecular Repair Hair Mask ($15) is a 78% match dupe for Olaplex No. 3 Hair Perfector ($38) — 61% cheaper for a comparable formula. Full price and ingredient comparison below.
By the BeautyFlow Research Team · Updated July 2026
The Original
No. 3 Hair Perfector
$38The Dupe
Save 61%4 Minute Leave-In Molecular Repair Hair Mask
$15Originally spotted by
Ingredient Comparison
Ingredient data coming soon
Ingredient data coming soon
Frequently Asked Questions
Is K18 4 Minute Leave-In Molecular Repair Hair Mask a good dupe for Olaplex No. 3 Hair Perfector?
Yes — K18 4 Minute Leave-In Molecular Repair Hair Mask is a 78% match for Olaplex No. 3 Hair Perfector based on ingredient and formula comparison, at 61% less ($15 vs $38).
How much cheaper is K18 4 Minute Leave-In Molecular Repair Hair Mask than Olaplex No. 3 Hair Perfector?
K18 4 Minute Leave-In Molecular Repair Hair Mask costs $15 versus $38 for Olaplex No. 3 Hair Perfector — a saving of $23 (61% less).
What is the difference between Olaplex No. 3 Hair Perfector and K18 4 Minute Leave-In Molecular Repair Hair Mask?
The main difference is price — Olaplex No. 3 Hair Perfector costs $23 more. Formulas are closely matched in our comparison, though packaging and shade ranges may differ. See the full ingredient table on this page for the exact overlap.
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